From: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
To: Ming Lei <tom.leiming@gmail.com>
Cc: linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
Nilay Shroff <nilay@linux.ibm.com>
Subject: Re: [PATCH v2] block: serialize elevator changes for the same queue using a writer lock
Date: Wed, 24 Jun 2026 20:48:16 +0900 [thread overview]
Message-ID: <ajvCBkxdTCNt9JWI@shinmob> (raw)
In-Reply-To: <ajum7l5BPDRoeJgi@fedora>
On Jun 24, 2026 / 04:44, Ming Lei wrote:
> On Tue, Jun 23, 2026 at 10:32:38AM +0900, Shin'ichiro Kawasaki wrote:
[...]
> > Please refer to [1] for details of the failure. Also, I created a
> > blktests test case that recreates the hang [2], which I used to test the
> > fix.
> >
> > * Changes from RFC v1
> > - Instead of adding a new mutex to struct request_queue, replace the
> > reader lock on update_nr_hwq_lock with the writer lock in
> > elv_iosched_store().
> >
> > [1] https://lore.kernel.org/linux-block/20260611074200.474676-1-shinichiro.kawasaki@wdc.com/
> > [2] https://github.com/kawasaki/blktests/commit/8e80b3ccc0bbbe3f209d00eacd138d020de97fc6
> >
> > block/elevator.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
[...]
> I feel this is still abuse of the above lock, which serves writer vs
> reader wrt. updating hw queue.
>
> How about the following fix?
(snip)
Thank you for the idea. I applied the suggested fix on top of the v7.1 kernel,
and ran the test case that does the concurrent write to the sysfs sched file
[2]. Unfortunately, the test case hung. Before the hang, the kernel reported
WARNs in sysfs_create_dir_ns() [3]. KASAN slab-use-after-free was observed also.
I also noticed that another WARN was observed during boot [4].
[3]
[ 75.184223] [ T1820] run blktests block/044 at 2026-06-24 20:37:20
[ 75.229561] [ T1830] null_blk: disk nullb0 created
[ 75.234717] [ T1830] null_blk: module loaded
[ 75.249186] [ T1820] null_blk: disk nullb1 created
[ 88.092222] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 88.102051] [ T1842] CPU: 6 UID: 0 PID: 1842 Comm: check Tainted: G W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 88.102067] [ T1842] Tainted: [W]=WARN
[ 88.102070] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 88.102075] [ T1842] Call Trace:
[ 88.102080] [ T1842] <TASK>
[ 88.102084] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 88.102105] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 88.102117] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 88.102132] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 88.102146] [ T1842] ? kfree+0x1d6/0x620
[ 88.102156] [ T1842] kobject_add_internal+0x26f/0x800
[ 88.102171] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 88.102180] [ T1842] kobject_add+0x139/0x1a0
[ 88.102190] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 88.102199] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 88.102208] [ T1842] ? kasan_quarantine_put+0xf5/0x240
[ 88.102218] [ T1842] ? kfree+0x21c/0x620
[ 88.102228] [ T1842] ? trace_hardirqs_on+0x53/0x1a0
[ 88.102237] [ T1842] elevator_change_done+0x26f/0x690
[ 88.102250] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 88.102259] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 88.102274] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 88.102285] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 88.102293] [ T1842] elevator_change+0x283/0x4f0
[ 88.102305] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 88.102314] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 88.102326] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 88.102335] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 88.102351] [ T1842] ? lock_acquire+0x126/0x140
[ 88.102364] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 88.102373] [ T1842] queue_attr_store+0x23f/0x360
[ 88.102382] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 88.102393] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 88.102401] [ T1842] ? lock_release+0xfa/0x120
[ 88.102412] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 88.102442] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 88.102452] [ T1842] ? lock_acquire+0x126/0x140
[ 88.102462] [ T1842] ? lock_acquire+0x126/0x140
[ 88.102473] [ T1842] ? lock_release+0xfa/0x120
[ 88.102483] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 88.102492] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 88.102503] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 88.102511] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 88.102522] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 88.102530] [ T1842] vfs_write+0x524/0x1010
[ 88.102541] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 88.102548] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 88.102558] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 88.102574] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 88.102586] [ T1842] ksys_write+0xff/0x200
[ 88.102595] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 88.102607] [ T1842] do_syscall_64+0xf4/0x660
[ 88.102620] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 88.102637] [ T1842] ? count_memcg_events+0x37f/0x480
[ 88.102651] [ T1842] ? lock_release+0xfa/0x120
[ 88.102662] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 88.102670] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 88.102680] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 88.102693] [ T1842] ? lock_release+0xfa/0x120
[ 88.102703] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 88.102713] [ T1842] ? irqentry_exit+0xb0/0x810
[ 88.102720] [ T1842] ? do_syscall_64+0x34/0x660
[ 88.102730] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 88.102737] [ T1842] ? irqentry_exit+0xb5/0x810
[ 88.102743] [ T1842] ? do_syscall_64+0xab/0x660
[ 88.102754] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 88.102762] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 88.102772] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 88.102779] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 88.102789] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 88.102800] [ T1842] RDX: 0000000000000004 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 88.102809] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 88.102818] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
[ 88.102827] [ T1842] R13: 0000000000000004 R14: 0000562ec532aa50 R15: 0000562ec5397300
[ 88.102854] [ T1842] </TASK>
[ 88.536717] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 90.116333] [ T1841] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 90.127915] [ T1841] CPU: 0 UID: 0 PID: 1841 Comm: check Tainted: G W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 90.127935] [ T1841] Tainted: [W]=WARN
[ 90.127937] [ T1841] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 90.127941] [ T1841] Call Trace:
[ 90.127945] [ T1841] <TASK>
[ 90.127952] [ T1841] dump_stack_lvl+0x6e/0xa0
[ 90.127971] [ T1841] sysfs_warn_dup.cold+0x17/0x24
[ 90.127982] [ T1841] sysfs_create_dir_ns+0x1fc/0x270
[ 90.128000] [ T1841] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 90.128010] [ T1841] ? kfree+0x1d6/0x620
[ 90.128024] [ T1841] kobject_add_internal+0x26f/0x800
[ 90.128032] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.128039] [ T1841] kobject_add+0x139/0x1a0
[ 90.128044] [ T1841] ? trace_hardirqs_on+0x19/0x1a0
[ 90.128048] [ T1841] ? __pfx_kobject_add+0x10/0x10
[ 90.128053] [ T1841] ? kasan_quarantine_put+0xf5/0x240
[ 90.128058] [ T1841] ? kfree+0x21c/0x620
[ 90.128063] [ T1841] ? trace_hardirqs_on+0x53/0x1a0
[ 90.128066] [ T1841] elevator_change_done+0x26f/0x690
[ 90.128074] [ T1841] ? __pfx_elevator_change_done+0x10/0x10
[ 90.128078] [ T1841] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 90.128086] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.128091] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.128095] [ T1841] elevator_change+0x283/0x4f0
[ 90.128103] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.128107] [ T1841] elv_iosched_store+0x30c/0x3a0
[ 90.128112] [ T1841] ? __pfx_elv_iosched_store+0x10/0x10
[ 90.128116] [ T1841] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 90.128131] [ T1841] ? lock_acquire+0x126/0x140
[ 90.128138] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.128142] [ T1841] queue_attr_store+0x23f/0x360
[ 90.128150] [ T1841] ? __mutex_lock+0x1536/0x25a0
[ 90.128155] [ T1841] ? __pfx_queue_attr_store+0x10/0x10
[ 90.128159] [ T1841] ? lock_release+0xfa/0x120
[ 90.128164] [ T1841] ? __pfx___mutex_lock+0x10/0x10
[ 90.128169] [ T1841] ? __pfx__copy_from_iter+0x10/0x10
[ 90.128175] [ T1841] ? lock_acquire+0x126/0x140
[ 90.128179] [ T1841] ? lock_acquire+0x126/0x140
[ 90.128184] [ T1841] ? lock_release+0xfa/0x120
[ 90.128192] [ T1841] ? sysfs_file_kobj+0xb9/0x1b0
[ 90.128196] [ T1841] ? sysfs_kf_write+0x65/0x170
[ 90.128201] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.128205] [ T1841] kernfs_fop_write_iter+0x3da/0x5e0
[ 90.128214] [ T1841] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 90.128218] [ T1841] vfs_write+0x524/0x1010
[ 90.128223] [ T1841] ? __pfx_vfs_write+0x10/0x10
[ 90.128229] [ T1841] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 90.128238] [ T1841] ? __pfx_pte_val+0x10/0x10
[ 90.128244] [ T1841] ksys_write+0xff/0x200
[ 90.128248] [ T1841] ? __pfx_ksys_write+0x10/0x10
[ 90.128252] [ T1841] ? lock_release+0xfa/0x120
[ 90.128257] [ T1841] ? rcu_read_unlock+0x1c/0x60
[ 90.128260] [ T1841] ? wp_page_reuse+0x160/0x1e0
[ 90.128265] [ T1841] do_syscall_64+0xf4/0x660
[ 90.128277] [ T1841] ? handle_pte_fault+0x54e/0x760
[ 90.128283] [ T1841] ? __pfx_handle_pte_fault+0x10/0x10
[ 90.128288] [ T1841] ? __pfx_pmd_val+0x10/0x10
[ 90.128293] [ T1841] ? __handle_mm_fault+0xa02/0xef0
[ 90.128302] [ T1841] ? do_raw_spin_unlock+0x59/0x230
[ 90.128306] [ T1841] ? __pfx___css_rstat_updated+0x10/0x10
[ 90.128315] [ T1841] ? count_memcg_events+0x37f/0x480
[ 90.128328] [ T1841] ? lock_release+0xfa/0x120
[ 90.128332] [ T1841] ? rcu_read_unlock+0x1c/0x60
[ 90.128336] [ T1841] ? handle_mm_fault+0x4d1/0x7d0
[ 90.128341] [ T1841] ? do_user_addr_fault+0x15d/0xed0
[ 90.128347] [ T1841] ? lock_release+0xfa/0x120
[ 90.128351] [ T1841] ? do_user_addr_fault+0x811/0xed0
[ 90.128356] [ T1841] ? irqentry_exit+0xb0/0x810
[ 90.128359] [ T1841] ? do_syscall_64+0x34/0x660
[ 90.128367] [ T1841] ? trace_hardirqs_on+0x19/0x1a0
[ 90.128370] [ T1841] ? irqentry_exit+0xb5/0x810
[ 90.128373] [ T1841] ? do_syscall_64+0xab/0x660
[ 90.128378] [ T1841] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 90.128388] [ T1841] RIP: 0033:0x7f96f4878bbe
[ 90.128393] [ T1841] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 90.128396] [ T1841] RSP: 002b:00007ffcb76eba90 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 90.128402] [ T1841] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 90.128405] [ T1841] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 90.128410] [ T1841] RBP: 00007ffcb76ebaa0 R08: 0000000000000000 R09: 0000000000000000
[ 90.128413] [ T1841] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 90.128415] [ T1841] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5397e70
[ 90.128421] [ T1841] </TASK>
[ 90.128435] [ T1841] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 90.638084] [ T1841] ==================================================================
[ 90.646403] [ T1841] BUG: KASAN: slab-use-after-free in blk_mq_free_sched_tags+0x124/0x160
[ 90.654950] [ T1841] Read of size 4 at addr ffff88818265ad40 by task check/1841
[ 90.665102] [ T1841] CPU: 4 UID: 0 PID: 1841 Comm: check Tainted: G W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 90.665108] [ T1841] Tainted: [W]=WARN
[ 90.665109] [ T1841] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 90.665111] [ T1841] Call Trace:
[ 90.665113] [ T1841] <TASK>
[ 90.665115] [ T1841] dump_stack_lvl+0x6e/0xa0
[ 90.665123] [ T1841] print_address_description.constprop.0+0x70/0x300
[ 90.665129] [ T1841] ? blk_mq_free_sched_tags+0x124/0x160
[ 90.665132] [ T1841] print_report+0xfc/0x1ff
[ 90.665136] [ T1841] ? __virt_addr_valid+0x1d1/0x3f0
[ 90.665141] [ T1841] ? blk_mq_free_sched_tags+0x124/0x160
[ 90.665143] [ T1841] kasan_report+0xf6/0x1c0
[ 90.665148] [ T1841] ? blk_mq_free_sched_tags+0x124/0x160
[ 90.665152] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.665157] [ T1841] blk_mq_free_sched_tags+0x124/0x160
[ 90.665160] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.665163] [ T1841] blk_mq_free_sched_res+0x50/0x170
[ 90.665167] [ T1841] elevator_change_done+0x4f6/0x690
[ 90.665172] [ T1841] ? __pfx_elevator_change_done+0x10/0x10
[ 90.665175] [ T1841] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 90.665181] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.665185] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.665188] [ T1841] elevator_change+0x283/0x4f0
[ 90.665192] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.665196] [ T1841] elv_iosched_store+0x30c/0x3a0
[ 90.665200] [ T1841] ? __pfx_elv_iosched_store+0x10/0x10
[ 90.665204] [ T1841] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 90.665209] [ T1841] ? lock_acquire+0x126/0x140
[ 90.665215] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.665218] [ T1841] queue_attr_store+0x23f/0x360
[ 90.665222] [ T1841] ? __mutex_lock+0x1536/0x25a0
[ 90.665226] [ T1841] ? __pfx_queue_attr_store+0x10/0x10
[ 90.665229] [ T1841] ? lock_release+0xfa/0x120
[ 90.665233] [ T1841] ? __pfx___mutex_lock+0x10/0x10
[ 90.665237] [ T1841] ? __pfx__copy_from_iter+0x10/0x10
[ 90.665241] [ T1841] ? lock_acquire+0x126/0x140
[ 90.665244] [ T1841] ? lock_acquire+0x126/0x140
[ 90.665248] [ T1841] ? lock_release+0xfa/0x120
[ 90.665252] [ T1841] ? sysfs_file_kobj+0xb9/0x1b0
[ 90.665255] [ T1841] ? sysfs_kf_write+0x65/0x170
[ 90.665259] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 90.665262] [ T1841] kernfs_fop_write_iter+0x3da/0x5e0
[ 90.665266] [ T1841] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 90.665268] [ T1841] vfs_write+0x524/0x1010
[ 90.665273] [ T1841] ? __pfx_vfs_write+0x10/0x10
[ 90.665278] [ T1841] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 90.665281] [ T1841] ? __pfx_pte_val+0x10/0x10
[ 90.665286] [ T1841] ksys_write+0xff/0x200
[ 90.665289] [ T1841] ? __pfx_ksys_write+0x10/0x10
[ 90.665292] [ T1841] ? lock_release+0xfa/0x120
[ 90.665295] [ T1841] ? rcu_read_unlock+0x1c/0x60
[ 90.665298] [ T1841] ? wp_page_reuse+0x160/0x1e0
[ 90.665302] [ T1841] do_syscall_64+0xf4/0x660
[ 90.665308] [ T1841] ? handle_pte_fault+0x54e/0x760
[ 90.665312] [ T1841] ? __pfx_handle_pte_fault+0x10/0x10
[ 90.665316] [ T1841] ? __pfx_pmd_val+0x10/0x10
[ 90.665320] [ T1841] ? __handle_mm_fault+0xa02/0xef0
[ 90.665324] [ T1841] ? do_raw_spin_unlock+0x59/0x230
[ 90.665327] [ T1841] ? __pfx___css_rstat_updated+0x10/0x10
[ 90.665334] [ T1841] ? count_memcg_events+0x37f/0x480
[ 90.665339] [ T1841] ? lock_release+0xfa/0x120
[ 90.665343] [ T1841] ? rcu_read_unlock+0x1c/0x60
[ 90.665345] [ T1841] ? handle_mm_fault+0x4d1/0x7d0
[ 90.665349] [ T1841] ? do_user_addr_fault+0x15d/0xed0
[ 90.665353] [ T1841] ? lock_release+0xfa/0x120
[ 90.665357] [ T1841] ? do_user_addr_fault+0x811/0xed0
[ 90.665360] [ T1841] ? irqentry_exit+0xb0/0x810
[ 90.665363] [ T1841] ? do_syscall_64+0x34/0x660
[ 90.665366] [ T1841] ? trace_hardirqs_on+0x19/0x1a0
[ 90.665369] [ T1841] ? irqentry_exit+0xb5/0x810
[ 90.665372] [ T1841] ? do_syscall_64+0xab/0x660
[ 90.665375] [ T1841] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 90.665378] [ T1841] RIP: 0033:0x7f96f4878bbe
[ 90.665383] [ T1841] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 90.665385] [ T1841] RSP: 002b:00007ffcb76eba90 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 90.665390] [ T1841] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 90.665392] [ T1841] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 90.665394] [ T1841] RBP: 00007ffcb76ebaa0 R08: 0000000000000000 R09: 0000000000000000
[ 90.665396] [ T1841] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 90.665397] [ T1841] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5397e70
[ 90.665402] [ T1841] </TASK>
[ 91.124911] [ T1841] Allocated by task 1841:
[ 91.129401] [ T1841] kasan_save_stack+0x30/0x50
[ 91.134237] [ T1841] kasan_save_track+0x14/0x30
[ 91.139072] [ T1841] __kasan_kmalloc+0x9a/0xb0
[ 91.143822] [ T1841] __kmalloc_noprof+0x2bb/0x820
[ 91.148832] [ T1841] blk_mq_alloc_sched_tags+0x72/0x2f0
[ 91.154364] [ T1841] blk_mq_alloc_sched_res+0x86/0x220
[ 91.159802] [ T1841] elevator_change+0x113/0x4f0
[ 91.164725] [ T1841] elv_iosched_store+0x30c/0x3a0
[ 91.169821] [ T1841] queue_attr_store+0x23f/0x360
[ 91.174832] [ T1841] kernfs_fop_write_iter+0x3da/0x5e0
[ 91.180276] [ T1841] vfs_write+0x524/0x1010
[ 91.184765] [ T1841] ksys_write+0xff/0x200
[ 91.189168] [ T1841] do_syscall_64+0xf4/0x660
[ 91.193833] [ T1841] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 91.202386] [ T1841] Freed by task 1842:
[ 91.206535] [ T1841] kasan_save_stack+0x30/0x50
[ 91.211380] [ T1841] kasan_save_track+0x14/0x30
[ 91.216222] [ T1841] kasan_save_free_info+0x3b/0x70
[ 91.221414] [ T1841] __kasan_slab_free+0x6b/0x90
[ 91.226346] [ T1841] kfree+0x21c/0x620
[ 91.230409] [ T1841] blk_mq_free_sched_res+0x50/0x170
[ 91.235777] [ T1841] elevator_change_done+0x17f/0x690
[ 91.241141] [ T1841] elevator_change+0x283/0x4f0
[ 91.246069] [ T1841] elv_iosched_store+0x30c/0x3a0
[ 91.251174] [ T1841] queue_attr_store+0x23f/0x360
[ 91.256195] [ T1841] kernfs_fop_write_iter+0x3da/0x5e0
[ 91.261647] [ T1841] vfs_write+0x524/0x1010
[ 91.266146] [ T1841] ksys_write+0xff/0x200
[ 91.270556] [ T1841] do_syscall_64+0xf4/0x660
[ 91.275227] [ T1841] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 91.283792] [ T1841] The buggy address belongs to the object at ffff88818265ad40
which belongs to the cache kmalloc-rnd-04-32 of size 32
[ 91.298776] [ T1841] The buggy address is located 0 bytes inside of
freed 32-byte region [ffff88818265ad40, ffff88818265ad60)
[ 91.315327] [ T1841] The buggy address belongs to the physical page:
[ 91.321911] [ T1841] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18265a
[ 91.330919] [ T1841] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)
[ 91.338457] [ T1841] page_type: f5(slab)
[ 91.342604] [ T1841] raw: 0017ffffc0000000 ffff88810004ca00 dead000000000100 dead000000000122
[ 91.351361] [ T1841] raw: 0000000000000000 0000000800400040 00000000f5000000 0000000000000000
[ 91.360116] [ T1841] page dumped because: kasan: bad access detected
[ 91.369218] [ T1841] Memory state around the buggy address:
[ 91.375028] [ T1841] ffff88818265ac00: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[ 91.383280] [ T1841] ffff88818265ac80: fc fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
[ 91.391530] [ T1841] >ffff88818265ad00: fc fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
[ 91.399782] [ T1841] ^
[ 91.406132] [ T1841] ffff88818265ad80: fc fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
[ 91.414400] [ T1841] ffff88818265ae00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[ 91.422666] [ T1841] ==================================================================
[ 91.431032] [ T1841] Oops: general protection fault, probably for non-canonical address 0xe066fc31c00000fa: 0000 [#1] SMP KASAN PTI
[ 91.449248] [ T1841] KASAN: maybe wild-memory-access in range [0x0338018e000007d0-0x0338018e000007d7]
[ 91.458755] [ T1841] CPU: 0 UID: 0 PID: 1841 Comm: check Tainted: G B W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 91.469576] [ T1841] Tainted: [B]=BAD_PAGE, [W]=WARN
[ 91.474834] [ T1841] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 91.483316] [ T1841] RIP: 0010:blk_mq_free_rqs+0x38/0x790
[ 91.489034] [ T1841] Code: 00 00 fc ff df 41 57 49 89 f7 48 81 c6 a0 00 00 00 41 56 49 89 fe 41 55 41 54 55 53 48 83 ec 48 89 14 24 48 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 fa 05 00 00 49 8b 87 a0 00 00 00 48 39 c6 0f 84
[ 91.509311] [ T1841] RSP: 0018:ffff88815455f530 EFLAGS: 00010206
[ 91.515656] [ T1841] RAX: dffffc0000000000 RBX: 0338018e00000732 RCX: 0000000000000000
[ 91.523920] [ T1841] RDX: 00670031c00000fa RSI: 0338018e000007d2 RDI: ffff888148d6f838
[ 91.532185] [ T1841] RBP: ffff888148d6f838 R08: ffffffffa7baa33a R09: fffffbfff5c10688
[ 91.540452] [ T1841] R10: fffffbfff5c10689 R11: 0000000000000001 R12: ffff88818265ad40
[ 91.548727] [ T1841] R13: ffff888148d6f838 R14: ffff888148d6f838 R15: 0338018e00000732
[ 91.557009] [ T1841] FS: 00007f96f4807780(0000) GS:ffff8887afe48000(0000) knlGS:0000000000000000
[ 91.566248] [ T1841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 91.573153] [ T1841] CR2: 0000562ec532aa51 CR3: 0000000144fee001 CR4: 00000000001726f0
[ 91.581447] [ T1841] Call Trace:
[ 91.585060] [ T1841] <TASK>
[ 91.588325] [ T1841] blk_mq_free_map_and_rqs+0x23/0x130
[ 91.594029] [ T1841] blk_mq_free_sched_tags+0xbd/0x160
[ 91.599636] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 91.605159] [ T1841] blk_mq_free_sched_res+0x50/0x170
[ 91.610681] [ T1841] elevator_change_done+0x4f6/0x690
[ 91.616204] [ T1841] ? __pfx_elevator_change_done+0x10/0x10
[ 91.622245] [ T1841] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 91.628363] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 91.633880] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 91.639384] [ T1841] elevator_change+0x283/0x4f0
[ 91.644453] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 91.649987] [ T1841] elv_iosched_store+0x30c/0x3a0
[ 91.655224] [ T1841] ? __pfx_elv_iosched_store+0x10/0x10
[ 91.660981] [ T1841] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 91.667337] [ T1841] ? lock_acquire+0x126/0x140
[ 91.672301] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 91.677778] [ T1841] queue_attr_store+0x23f/0x360
[ 91.682911] [ T1841] ? __mutex_lock+0x1536/0x25a0
[ 91.688037] [ T1841] ? __pfx_queue_attr_store+0x10/0x10
[ 91.693674] [ T1841] ? lock_release+0xfa/0x120
[ 91.698532] [ T1841] ? __pfx___mutex_lock+0x10/0x10
[ 91.703815] [ T1841] ? __pfx__copy_from_iter+0x10/0x10
[ 91.709362] [ T1841] ? lock_acquire+0x126/0x140
[ 91.714306] [ T1841] ? lock_acquire+0x126/0x140
[ 91.719248] [ T1841] ? lock_release+0xfa/0x120
[ 91.724094] [ T1841] ? sysfs_file_kobj+0xb9/0x1b0
[ 91.729198] [ T1841] ? sysfs_kf_write+0x65/0x170
[ 91.734214] [ T1841] ? __pfx_sysfs_kf_write+0x10/0x10
[ 91.739640] [ T1841] kernfs_fop_write_iter+0x3da/0x5e0
[ 91.745162] [ T1841] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 91.751187] [ T1841] vfs_write+0x524/0x1010
[ 91.755728] [ T1841] ? __pfx_vfs_write+0x10/0x10
[ 91.760694] [ T1841] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 91.766260] [ T1841] ? __pfx_pte_val+0x10/0x10
[ 91.771042] [ T1841] ksys_write+0xff/0x200
[ 91.775465] [ T1841] ? __pfx_ksys_write+0x10/0x10
[ 91.780477] [ T1841] ? lock_release+0xfa/0x120
[ 91.785218] [ T1841] ? rcu_read_unlock+0x1c/0x60
[ 91.790134] [ T1841] ? wp_page_reuse+0x160/0x1e0
[ 91.795053] [ T1841] do_syscall_64+0xf4/0x660
[ 91.799701] [ T1841] ? handle_pte_fault+0x54e/0x760
[ 91.804864] [ T1841] ? __pfx_handle_pte_fault+0x10/0x10
[ 91.810371] [ T1841] ? __pfx_pmd_val+0x10/0x10
[ 91.815090] [ T1841] ? __handle_mm_fault+0xa02/0xef0
[ 91.820327] [ T1841] ? do_raw_spin_unlock+0x59/0x230
[ 91.825555] [ T1841] ? __pfx___css_rstat_updated+0x10/0x10
[ 91.831307] [ T1841] ? count_memcg_events+0x37f/0x480
[ 91.836623] [ T1841] ? lock_release+0xfa/0x120
[ 91.841334] [ T1841] ? rcu_read_unlock+0x1c/0x60
[ 91.846214] [ T1841] ? handle_mm_fault+0x4d1/0x7d0
[ 91.851268] [ T1841] ? do_user_addr_fault+0x15d/0xed0
[ 91.856588] [ T1841] ? lock_release+0xfa/0x120
[ 91.861293] [ T1841] ? do_user_addr_fault+0x811/0xed0
[ 91.866606] [ T1841] ? irqentry_exit+0xb0/0x810
[ 91.871396] [ T1841] ? do_syscall_64+0x34/0x660
[ 91.876188] [ T1841] ? trace_hardirqs_on+0x19/0x1a0
[ 91.881331] [ T1841] ? irqentry_exit+0xb5/0x810
[ 91.886129] [ T1841] ? do_syscall_64+0xab/0x660
[ 91.890926] [ T1841] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 91.896937] [ T1841] RIP: 0033:0x7f96f4878bbe
[ 91.901471] [ T1841] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 91.921483] [ T1841] RSP: 002b:00007ffcb76eba90 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 91.930047] [ T1841] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 91.938176] [ T1841] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 91.946306] [ T1841] RBP: 00007ffcb76ebaa0 R08: 0000000000000000 R09: 0000000000000000
[ 91.954436] [ T1841] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 91.962567] [ T1841] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5397e70
[ 91.970702] [ T1841] </TASK>
[ 91.973886] [ T1841] Modules linked in: null_blk nft_masq nft_reject_ipv4 act_csum cls_u32 sch_htb nf_nat_tftp nf_conntrack_tftp bridge stp llc target_core_user target_core_mod rfkill nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security nf_tables ip6table_filter ip6_tables iptable_filter ip_tables qrtr intel_rapl_msr intel_rapl_common sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel iTCO_wdt intel_pmc_bxt kvm irqbypass rapl sunrpc intel_cstate intel_uncore pcspkr i2c_i801 i2c_smbus igb mei_me lpc_ich mei ioatdma dca wmi binfmt_misc joydev acpi_pad acpi_power_meter btrfs raid6_pq xor ses enclosure loop dm_multipath nfnetlink zram lz4hc_compress lz4_compress zstd_compress ast drm_client_lib i2c_algo_bit drm_shmem_helper
[ 91.974026] [ T1841] drm_kms_helper drm mpt3sas mpi3mr raid_class scsi_transport_sas scsi_dh_rdac scsi_dh_emc scsi_dh_alua i2c_dev fuse
[ 92.080026] [ T1841] ---[ end trace 0000000000000000 ]---
[ 92.106503] [ T1841] pstore: backend (erst) writing error (-28)
[ 92.112860] [ T1841] RIP: 0010:blk_mq_free_rqs+0x38/0x790
[ 92.118708] [ T1841] Code: 00 00 fc ff df 41 57 49 89 f7 48 81 c6 a0 00 00 00 41 56 49 89 fe 41 55 41 54 55 53 48 83 ec 48 89 14 24 48 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 fa 05 00 00 49 8b 87 a0 00 00 00 48 39 c6 0f 84
[ 92.139931] [ T1841] RSP: 0018:ffff88815455f530 EFLAGS: 00010206
[ 92.140007] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 92.145981] [ T1841] RAX: dffffc0000000000 RBX: 0338018e00000732 RCX: 0000000000000000
[ 92.155553] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 92.155560] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 92.155561] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 92.155563] [ T1842] Call Trace:
[ 92.155564] [ T1842] <TASK>
[ 92.155566] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 92.155624] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 92.155644] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 92.155652] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 92.155666] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 92.155672] [ T1842] ? kfree+0x1d6/0x620
[ 92.155682] [ T1842] kobject_add_internal+0x26f/0x800
[ 92.155690] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.155693] [ T1842] kobject_add+0x139/0x1a0
[ 92.155696] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 92.155703] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 92.155707] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 92.155710] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 92.155713] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 92.155716] [ T1842] elevator_change_done+0x26f/0x690
[ 92.155725] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 92.155728] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 92.155733] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.155737] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.155740] [ T1842] elevator_change+0x283/0x4f0
[ 92.155749] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.155752] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 92.155755] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 92.155759] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 92.155764] [ T1842] ? lock_acquire+0x126/0x140
[ 92.155773] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.155776] [ T1842] queue_attr_store+0x23f/0x360
[ 92.155779] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 92.155782] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 92.155785] [ T1842] ? lock_release+0xfa/0x120
[ 92.155793] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 92.155796] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 92.155801] [ T1842] ? lock_acquire+0x126/0x140
[ 92.155804] [ T1842] ? lock_acquire+0x126/0x140
[ 92.155807] [ T1842] ? lock_release+0xfa/0x120
[ 92.155811] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 92.155816] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 92.155820] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.155823] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 92.155826] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 92.155829] [ T1842] vfs_write+0x524/0x1010
[ 92.155843] [ T1842] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 92.155845] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 92.155850] [ T1842] ? do_fcntl+0x605/0x1030
[ 92.155860] [ T1842] ? __pfx_do_fcntl+0x10/0x10
[ 92.155864] [ T1842] ksys_write+0xff/0x200
[ 92.155867] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 92.155869] [ T1842] ? selinux_file_fcntl+0x1e/0x110
[ 92.155876] [ T1842] ? __pfx_pte_val+0x10/0x10
[ 92.155881] [ T1842] do_syscall_64+0xf4/0x660
[ 92.155885] [ T1842] ? ptep_set_access_flags+0xe5/0x130
[ 92.155888] [ T1842] ? __pfx_folio_xchg_last_cpupid+0x10/0x10
[ 92.155892] [ T1842] ? __pfx_ptep_set_access_flags+0x10/0x10
[ 92.155897] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 92.155901] [ T1842] ? lock_release+0xfa/0x120
[ 92.155904] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 92.155907] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 92.155911] [ T1842] ? do_wp_page+0x57e/0xf40
[ 92.155917] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 92.155959] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 92.155982] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 92.155991] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 92.155998] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 92.156003] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 92.156017] [ T1842] ? count_memcg_events+0x37f/0x480
[ 92.156028] [ T1842] ? lock_release+0xfa/0x120
[ 92.156033] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 92.156036] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 92.156039] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 92.156044] [ T1842] ? lock_release+0xfa/0x120
[ 92.156057] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 92.156060] [ T1842] ? irqentry_exit+0xb0/0x810
[ 92.156063] [ T1842] ? do_syscall_64+0x34/0x660
[ 92.156066] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 92.156073] [ T1842] ? irqentry_exit+0xb5/0x810
[ 92.156075] [ T1842] ? do_syscall_64+0xab/0x660
[ 92.156079] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 92.156081] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 92.156085] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 92.156087] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 92.156096] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 92.156098] [ T1842] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 92.156100] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 92.156102] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 92.156103] [ T1842] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5394f20
[ 92.156108] [ T1842] </TASK>
[ 92.156122] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 92.163427] [ T1841] RDX: 00670031c00000fa RSI: 0338018e000007d2 RDI: ffff888148d6f838
[ 92.701628] [ T1841] RBP: ffff888148d6f838 R08: ffffffffa7baa33a R09: fffffbfff5c10688
[ 92.717075] [ T1841] R10: fffffbfff5c10689 R11: 0000000000000001 R12: ffff88818265ad40
[ 92.732771] [ T1841] R13: ffff888148d6f838 R14: ffff888148d6f838 R15: 0338018e00000732
[ 92.748062] [ T1841] FS: 00007f96f4807780(0000) GS:ffff8887aff48000(0000) knlGS:0000000000000000
[ 92.763917] [ T1841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 92.779232] [ T1841] CR2: 0000562ec532aa50 CR3: 0000000144fee003 CR4: 00000000001726f0
[ 92.831074] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 92.841145] [ T1842] CPU: 3 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 92.841152] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 92.841154] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 92.841155] [ T1842] Call Trace:
[ 92.841157] [ T1842] <TASK>
[ 92.841159] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 92.841168] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 92.841173] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 92.841179] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 92.841183] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 92.841188] [ T1842] ? kfree+0x1d6/0x620
[ 92.841192] [ T1842] kobject_add_internal+0x26f/0x800
[ 92.841197] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.841200] [ T1842] kobject_add+0x139/0x1a0
[ 92.841203] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 92.841208] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 92.841212] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 92.841215] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 92.841219] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 92.841222] [ T1842] elevator_change_done+0x26f/0x690
[ 92.841227] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 92.841230] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 92.841236] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.841239] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.841242] [ T1842] elevator_change+0x283/0x4f0
[ 92.841246] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.841249] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 92.841253] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 92.841256] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 92.841261] [ T1842] ? lock_acquire+0x126/0x140
[ 92.841266] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.841269] [ T1842] queue_attr_store+0x23f/0x360
[ 92.841273] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 92.841276] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 92.841279] [ T1842] ? lock_release+0xfa/0x120
[ 92.841283] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 92.841286] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 92.841290] [ T1842] ? lock_acquire+0x126/0x140
[ 92.841294] [ T1842] ? lock_acquire+0x126/0x140
[ 92.841297] [ T1842] ? lock_release+0xfa/0x120
[ 92.841301] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 92.841304] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 92.841307] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 92.841310] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 92.841314] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 92.841317] [ T1842] vfs_write+0x524/0x1010
[ 92.841321] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 92.841327] [ T1842] ksys_write+0xff/0x200
[ 92.841330] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 92.841333] [ T1842] ? count_memcg_events+0x37f/0x480
[ 92.841338] [ T1842] do_syscall_64+0xf4/0x660
[ 92.841342] [ T1842] ? lock_release+0xfa/0x120
[ 92.841345] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 92.841349] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 92.841353] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 92.841358] [ T1842] ? lock_release+0xfa/0x120
[ 92.841362] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 92.841365] [ T1842] ? irqentry_exit+0xb0/0x810
[ 92.841368] [ T1842] ? do_syscall_64+0x34/0x660
[ 92.841371] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 92.841374] [ T1842] ? irqentry_exit+0xb5/0x810
[ 92.841376] [ T1842] ? do_syscall_64+0xab/0x660
[ 92.841380] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 92.841382] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 92.841386] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 92.841389] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 92.841393] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 92.841395] [ T1842] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 92.841397] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 92.841398] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 92.841400] [ T1842] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5382090
[ 92.841405] [ T1842] </TASK>
[ 92.841410] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 93.347152] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 93.357995] [ T1842] CPU: 7 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 93.358003] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 93.358004] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 93.358006] [ T1842] Call Trace:
[ 93.358008] [ T1842] <TASK>
[ 93.358015] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 93.358025] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 93.358030] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 93.358042] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 93.358047] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 93.358051] [ T1842] ? kasan_save_track+0x14/0x30
[ 93.358060] [ T1842] ? kfree+0x1d6/0x620
[ 93.358064] [ T1842] kobject_add_internal+0x26f/0x800
[ 93.358071] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.358074] [ T1842] kobject_add+0x139/0x1a0
[ 93.358085] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 93.358090] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 93.358094] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 93.358097] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 93.358109] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 93.358112] [ T1842] elevator_change_done+0x26f/0x690
[ 93.358122] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 93.358125] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 93.358131] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.358134] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.358137] [ T1842] elevator_change+0x283/0x4f0
[ 93.358144] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.358147] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 93.358151] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 93.358154] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 93.358160] [ T1842] ? lock_acquire+0x126/0x140
[ 93.358181] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.358190] [ T1842] queue_attr_store+0x23f/0x360
[ 93.358195] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 93.358198] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 93.358200] [ T1842] ? lock_release+0xfa/0x120
[ 93.358204] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 93.358211] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 93.358216] [ T1842] ? lock_acquire+0x126/0x140
[ 93.358219] [ T1842] ? lock_acquire+0x126/0x140
[ 93.358223] [ T1842] ? lock_release+0xfa/0x120
[ 93.358226] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 93.358238] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 93.358241] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.358244] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 93.358248] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 93.358254] [ T1842] vfs_write+0x524/0x1010
[ 93.358259] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 93.358262] [ T1842] ? __pfx_pte_val+0x10/0x10
[ 93.358266] [ T1842] ? ptep_set_access_flags+0xe5/0x130
[ 93.358274] [ T1842] ? __pfx_folio_xchg_last_cpupid+0x10/0x10
[ 93.358280] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 93.358282] [ T1842] ? lock_release+0xfa/0x120
[ 93.358285] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 93.358290] [ T1842] ksys_write+0xff/0x200
[ 93.358297] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 93.358300] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 93.358305] [ T1842] do_syscall_64+0xf4/0x660
[ 93.358310] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 93.358317] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 93.358324] [ T1842] ? fput_close+0x137/0x1a0
[ 93.358328] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 93.358349] [ T1842] ? count_memcg_events+0x37f/0x480
[ 93.358365] [ T1842] ? lock_release+0xfa/0x120
[ 93.358371] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 93.358375] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 93.358381] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 93.358390] [ T1842] ? lock_release+0xfa/0x120
[ 93.358395] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 93.358400] [ T1842] ? irqentry_exit+0xb0/0x810
[ 93.358415] [ T1842] ? do_syscall_64+0x34/0x660
[ 93.358420] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 93.358427] [ T1842] ? irqentry_exit+0xb5/0x810
[ 93.358430] [ T1842] ? do_syscall_64+0xab/0x660
[ 93.358436] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 93.358440] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 93.358450] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 93.358453] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 93.358459] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 93.358462] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 93.358465] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 93.358469] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 93.358471] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec53929c0
[ 93.358478] [ T1842] </TASK>
[ 93.358495] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 93.906005] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 93.916008] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 93.916015] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 93.916017] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 93.916018] [ T1842] Call Trace:
[ 93.916020] [ T1842] <TASK>
[ 93.916022] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 93.916031] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 93.916037] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 93.916043] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 93.916048] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 93.916052] [ T1842] ? kfree+0x1d6/0x620
[ 93.916056] [ T1842] kobject_add_internal+0x26f/0x800
[ 93.916062] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.916065] [ T1842] kobject_add+0x139/0x1a0
[ 93.916069] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 93.916073] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 93.916077] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 93.916080] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 93.916085] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 93.916088] [ T1842] elevator_change_done+0x26f/0x690
[ 93.916093] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 93.916096] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 93.916102] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.916106] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.916109] [ T1842] elevator_change+0x283/0x4f0
[ 93.916113] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.916116] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 93.916120] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 93.916123] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 93.916129] [ T1842] ? lock_acquire+0x126/0x140
[ 93.916133] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.916137] [ T1842] queue_attr_store+0x23f/0x360
[ 93.916141] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 93.916144] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 93.916146] [ T1842] ? lock_release+0xfa/0x120
[ 93.916150] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 93.916154] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 93.916158] [ T1842] ? lock_acquire+0x126/0x140
[ 93.916162] [ T1842] ? lock_acquire+0x126/0x140
[ 93.916165] [ T1842] ? lock_release+0xfa/0x120
[ 93.916169] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 93.916172] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 93.916176] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 93.916179] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 93.916183] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 93.916185] [ T1842] vfs_write+0x524/0x1010
[ 93.916189] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 93.916193] [ T1842] ? fput_close+0x137/0x1a0
[ 93.916198] [ T1842] ? __pfx_pte_val+0x10/0x10
[ 93.916202] [ T1842] ksys_write+0xff/0x200
[ 93.916205] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 93.916208] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 93.916211] [ T1842] ? lock_release+0xfa/0x120
[ 93.916215] [ T1842] do_syscall_64+0xf4/0x660
[ 93.916219] [ T1842] ? do_wp_page+0x57e/0xf40
[ 93.916224] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 93.916228] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 93.916231] [ T1842] ? fput_close_sync+0x137/0x1a0
[ 93.916234] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 93.916238] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 93.916242] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 93.916249] [ T1842] ? count_memcg_events+0x37f/0x480
[ 93.916255] [ T1842] ? lock_release+0xfa/0x120
[ 93.916258] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 93.916261] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 93.916265] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 93.916270] [ T1842] ? lock_release+0xfa/0x120
[ 93.916274] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 93.916277] [ T1842] ? irqentry_exit+0xb0/0x810
[ 93.916280] [ T1842] ? do_syscall_64+0x34/0x660
[ 93.916283] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 93.916286] [ T1842] ? irqentry_exit+0xb5/0x810
[ 93.916289] [ T1842] ? do_syscall_64+0xab/0x660
[ 93.916292] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 93.916295] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 93.916299] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 93.916302] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 93.916306] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 93.916308] [ T1842] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 93.916310] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 93.916311] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 93.916313] [ T1842] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5397300
[ 93.916318] [ T1842] </TASK>
[ 93.916324] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 94.437220] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 94.447276] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 94.447287] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 94.447289] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 94.447292] [ T1842] Call Trace:
[ 94.447295] [ T1842] <TASK>
[ 94.447297] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 94.447310] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 94.447317] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 94.447326] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 94.447333] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 94.447338] [ T1842] ? kasan_save_track+0x14/0x30
[ 94.447344] [ T1842] ? kfree+0x1d6/0x620
[ 94.447350] [ T1842] kobject_add_internal+0x26f/0x800
[ 94.447390] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 94.447455] [ T1842] kobject_add+0x139/0x1a0
[ 94.447521] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 94.447630] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 94.447696] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 94.447761] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 94.447849] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 94.447915] [ T1842] elevator_change_done+0x26f/0x690
[ 94.447943] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 94.447947] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 94.448008] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 94.448094] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 94.448117] [ T1842] elevator_change+0x283/0x4f0
[ 94.448204] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 94.448291] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 94.448379] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 94.448422] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 94.448552] [ T1842] ? lock_acquire+0x126/0x140
[ 94.448619] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 94.448684] [ T1842] queue_attr_store+0x23f/0x360
[ 94.448771] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 94.448837] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 94.448880] [ T1842] ? lock_release+0xfa/0x120
[ 94.448926] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 94.448933] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 94.449011] [ T1842] ? lock_acquire+0x126/0x140
[ 94.449077] [ T1842] ? lock_acquire+0x126/0x140
[ 94.449121] [ T1842] ? lock_release+0xfa/0x120
[ 94.449186] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 94.449251] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 94.449296] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 94.449360] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 94.449426] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 94.449513] [ T1842] vfs_write+0x524/0x1010
[ 94.449622] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 94.449688] [ T1842] ksys_write+0xff/0x200
[ 94.449732] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 94.449797] [ T1842] ? lock_release+0xfa/0x120
[ 94.449862] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 94.449933] [ T1842] do_syscall_64+0xf4/0x660
[ 94.449940] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 94.449945] [ T1842] ? irqentry_exit+0xb5/0x810
[ 94.449961] [ T1842] ? do_syscall_64+0xab/0x660
[ 94.449983] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 94.449988] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 94.450027] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 94.450071] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 94.450179] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 94.450223] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 94.450246] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 94.450289] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 94.450311] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec5395410
[ 94.450420] [ T1842] </TASK>
[ 95.163048] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 95.211096] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 95.221135] [ T1842] CPU: 7 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 95.221215] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 95.221258] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 95.221260] [ T1842] Call Trace:
[ 95.221303] [ T1842] <TASK>
[ 95.221367] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 95.221528] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 95.221636] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 95.221768] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 95.221855] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 95.221943] [ T1842] ? kfree+0x1d6/0x620
[ 95.221950] [ T1842] kobject_add_internal+0x26f/0x800
[ 95.221958] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 95.222036] [ T1842] kobject_add+0x139/0x1a0
[ 95.222102] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 95.222210] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 95.222297] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 95.222363] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 95.222451] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 95.222495] [ T1842] elevator_change_done+0x26f/0x690
[ 95.222624] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 95.222690] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 95.222798] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 95.222865] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 95.222930] [ T1842] elevator_change+0x283/0x4f0
[ 95.222958] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 95.222963] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 95.222969] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 95.222974] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 95.222984] [ T1842] ? lock_acquire+0x126/0x140
[ 95.222992] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 95.222997] [ T1842] queue_attr_store+0x23f/0x360
[ 95.223003] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 95.223009] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 95.223014] [ T1842] ? lock_release+0xfa/0x120
[ 95.223031] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 95.223117] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 95.223204] [ T1842] ? lock_acquire+0x126/0x140
[ 95.223249] [ T1842] ? lock_acquire+0x126/0x140
[ 95.223314] [ T1842] ? lock_release+0xfa/0x120
[ 95.223379] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 95.223444] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 95.223489] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 95.223553] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 95.223640] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 95.223684] [ T1842] vfs_write+0x524/0x1010
[ 95.223772] [ T1842] ? __pfx_locks_remove_posix+0x10/0x10
[ 95.223902] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 95.223953] [ T1842] ksys_write+0xff/0x200
[ 95.223972] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 95.223977] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 95.224036] [ T1842] ? lock_release+0xfa/0x120
[ 95.224122] [ T1842] do_syscall_64+0xf4/0x660
[ 95.224189] [ T1842] ? do_wp_page+0x57e/0xf40
[ 95.224256] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 95.224340] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 95.224385] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 95.224429] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 95.224516] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 95.224690] [ T1842] ? count_memcg_events+0x37f/0x480
[ 95.224777] [ T1842] ? lock_release+0xfa/0x120
[ 95.224843] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 95.224908] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 95.224954] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 95.224973] [ T1842] ? lock_release+0xfa/0x120
[ 95.225039] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 95.225084] [ T1842] ? irqentry_exit+0xb0/0x810
[ 95.225148] [ T1842] ? do_syscall_64+0x34/0x660
[ 95.225214] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 95.225279] [ T1842] ? irqentry_exit+0xb5/0x810
[ 95.225322] [ T1842] ? do_syscall_64+0xab/0x660
[ 95.225388] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 95.225454] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 95.225562] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 95.225628] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 95.225715] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 95.225780] [ T1842] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 95.225803] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 95.225846] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 95.225890] [ T1842] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5395360
[ 95.225959] [ T1842] </TASK>
[ 96.121095] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 96.243207] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 96.254050] [ T1842] CPU: 7 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 96.254058] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 96.254064] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 96.254066] [ T1842] Call Trace:
[ 96.254068] [ T1842] <TASK>
[ 96.254070] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 96.254079] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 96.254089] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 96.254096] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 96.254100] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 96.254111] [ T1842] ? kfree+0x1d6/0x620
[ 96.254115] [ T1842] kobject_add_internal+0x26f/0x800
[ 96.254121] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.254127] [ T1842] kobject_add+0x139/0x1a0
[ 96.254131] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 96.254135] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 96.254139] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 96.254142] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 96.254151] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 96.254154] [ T1842] elevator_change_done+0x26f/0x690
[ 96.254159] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 96.254162] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 96.254170] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.254174] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.254177] [ T1842] elevator_change+0x283/0x4f0
[ 96.254180] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.254183] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 96.254187] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 96.254192] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 96.254198] [ T1842] ? lock_acquire+0x126/0x140
[ 96.254202] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.254205] [ T1842] queue_attr_store+0x23f/0x360
[ 96.254209] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 96.254216] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 96.254219] [ T1842] ? lock_release+0xfa/0x120
[ 96.254223] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 96.254227] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 96.254231] [ T1842] ? lock_acquire+0x126/0x140
[ 96.254235] [ T1842] ? lock_acquire+0x126/0x140
[ 96.254238] [ T1842] ? lock_release+0xfa/0x120
[ 96.254242] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 96.254245] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 96.254248] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.254251] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 96.254265] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 96.254268] [ T1842] vfs_write+0x524/0x1010
[ 96.254272] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 96.254284] [ T1842] ksys_write+0xff/0x200
[ 96.254287] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 96.254290] [ T1842] ? lock_release+0xfa/0x120
[ 96.254294] [ T1842] do_syscall_64+0xf4/0x660
[ 96.254301] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 96.254307] [ T1842] ? lock_release+0xfa/0x120
[ 96.254310] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 96.254314] [ T1842] ? irqentry_exit+0xb0/0x810
[ 96.254316] [ T1842] ? do_syscall_64+0x34/0x660
[ 96.254321] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 96.254326] [ T1842] ? irqentry_exit+0xb5/0x810
[ 96.254328] [ T1842] ? do_syscall_64+0xab/0x660
[ 96.254331] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 96.254334] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 96.254338] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 96.254348] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 96.254352] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 96.254354] [ T1842] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 96.254356] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 96.254357] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 96.254359] [ T1842] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec53956a0
[ 96.254373] [ T1842] </TASK>
[ 96.254379] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 96.715123] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 96.725123] [ T1842] CPU: 3 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 96.725129] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 96.725131] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 96.725133] [ T1842] Call Trace:
[ 96.725135] [ T1842] <TASK>
[ 96.725136] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 96.725145] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 96.725150] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 96.725156] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 96.725161] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 96.725165] [ T1842] ? kfree+0x1d6/0x620
[ 96.725169] [ T1842] kobject_add_internal+0x26f/0x800
[ 96.725175] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.725178] [ T1842] kobject_add+0x139/0x1a0
[ 96.725181] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 96.725185] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 96.725189] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 96.725192] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 96.725196] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 96.725199] [ T1842] elevator_change_done+0x26f/0x690
[ 96.725204] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 96.725207] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 96.725212] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.725216] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.725219] [ T1842] elevator_change+0x283/0x4f0
[ 96.725223] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.725226] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 96.725230] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 96.725233] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 96.725238] [ T1842] ? lock_acquire+0x126/0x140
[ 96.725243] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.725245] [ T1842] queue_attr_store+0x23f/0x360
[ 96.725249] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 96.725252] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 96.725255] [ T1842] ? lock_release+0xfa/0x120
[ 96.725259] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 96.725262] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 96.725267] [ T1842] ? lock_acquire+0x126/0x140
[ 96.725270] [ T1842] ? lock_acquire+0x126/0x140
[ 96.725274] [ T1842] ? lock_release+0xfa/0x120
[ 96.725277] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 96.725280] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 96.725284] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 96.725286] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 96.725290] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 96.725293] [ T1842] vfs_write+0x524/0x1010
[ 96.725297] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 96.725302] [ T1842] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 96.725304] [ T1842] ? lock_acquire+0x126/0x140
[ 96.725308] [ T1842] ksys_write+0xff/0x200
[ 96.725311] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 96.725314] [ T1842] ? __pfx_pte_val+0x10/0x10
[ 96.725318] [ T1842] ? folio_xchg_last_cpupid+0xc6/0x130
[ 96.725323] [ T1842] do_syscall_64+0xf4/0x660
[ 96.725327] [ T1842] ? __pfx_ptep_set_access_flags+0x10/0x10
[ 96.725331] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 96.725334] [ T1842] ? lock_release+0xfa/0x120
[ 96.725337] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 96.725340] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 96.725344] [ T1842] ? do_wp_page+0x57e/0xf40
[ 96.725348] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 96.725352] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 96.725355] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 96.725359] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 96.725363] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 96.725370] [ T1842] ? count_memcg_events+0x37f/0x480
[ 96.725375] [ T1842] ? lock_release+0xfa/0x120
[ 96.725378] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 96.725381] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 96.725385] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 96.725389] [ T1842] ? lock_release+0xfa/0x120
[ 96.725393] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 96.725396] [ T1842] ? irqentry_exit+0xb0/0x810
[ 96.725399] [ T1842] ? do_syscall_64+0x34/0x660
[ 96.725402] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 96.725405] [ T1842] ? irqentry_exit+0xb5/0x810
[ 96.725407] [ T1842] ? do_syscall_64+0xab/0x660
[ 96.725411] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 96.725413] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 96.725417] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 96.725419] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 96.725423] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 96.725425] [ T1842] RDX: 0000000000000004 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 96.725427] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 96.725429] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
[ 96.725430] [ T1842] R13: 0000000000000004 R14: 0000562ec532aa50 R15: 0000562ec5399dc0
[ 96.725435] [ T1842] </TASK>
[ 96.725440] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 97.266189] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 97.276171] [ T1842] CPU: 7 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 97.276178] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 97.276179] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 97.276181] [ T1842] Call Trace:
[ 97.276183] [ T1842] <TASK>
[ 97.276185] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 97.276194] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 97.276199] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 97.276206] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 97.276210] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 97.276214] [ T1842] ? kasan_save_track+0x14/0x30
[ 97.276218] [ T1842] ? kfree+0x1d6/0x620
[ 97.276222] [ T1842] kobject_add_internal+0x26f/0x800
[ 97.276228] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.276232] [ T1842] kobject_add+0x139/0x1a0
[ 97.276235] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 97.276239] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 97.276243] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 97.276246] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 97.276250] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 97.276253] [ T1842] elevator_change_done+0x26f/0x690
[ 97.276259] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 97.276262] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 97.276268] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.276272] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.276275] [ T1842] elevator_change+0x283/0x4f0
[ 97.276279] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.276282] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 97.276286] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 97.276289] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 97.276295] [ T1842] ? lock_acquire+0x126/0x140
[ 97.276300] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.276303] [ T1842] queue_attr_store+0x23f/0x360
[ 97.276307] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 97.276310] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 97.276313] [ T1842] ? lock_release+0xfa/0x120
[ 97.276317] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 97.276321] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 97.276325] [ T1842] ? lock_acquire+0x126/0x140
[ 97.276329] [ T1842] ? lock_acquire+0x126/0x140
[ 97.276332] [ T1842] ? lock_release+0xfa/0x120
[ 97.276336] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 97.276339] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 97.276343] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.276345] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 97.276349] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 97.276352] [ T1842] vfs_write+0x524/0x1010
[ 97.276356] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 97.276361] [ T1842] ? __pfx_fput_close_sync+0x10/0x10
[ 97.276365] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 97.276369] [ T1842] ksys_write+0xff/0x200
[ 97.276372] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 97.276374] [ T1842] ? ptep_set_access_flags+0xe5/0x130
[ 97.276378] [ T1842] ? __pfx_ptep_set_access_flags+0x10/0x10
[ 97.276381] [ T1842] do_syscall_64+0xf4/0x660
[ 97.276386] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 97.276390] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 97.276394] [ T1842] ? do_wp_page+0x57e/0xf40
[ 97.276398] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 97.276402] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 97.276406] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 97.276410] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 97.276414] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 97.276422] [ T1842] ? count_memcg_events+0x37f/0x480
[ 97.276428] [ T1842] ? lock_release+0xfa/0x120
[ 97.276431] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 97.276434] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 97.276437] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 97.276443] [ T1842] ? lock_release+0xfa/0x120
[ 97.276446] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 97.276450] [ T1842] ? irqentry_exit+0xb0/0x810
[ 97.276452] [ T1842] ? do_syscall_64+0x34/0x660
[ 97.276456] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 97.276458] [ T1842] ? irqentry_exit+0xb5/0x810
[ 97.276461] [ T1842] ? do_syscall_64+0xab/0x660
[ 97.276464] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 97.276467] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 97.276470] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 97.276473] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 97.276477] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 97.276479] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 97.276481] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 97.276483] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 97.276484] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec53972c0
[ 97.276489] [ T1842] </TASK>
[ 97.276495] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 97.804201] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 97.814639] [ T1842] CPU: 7 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 97.814813] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 97.814835] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 97.814879] [ T1842] Call Trace:
[ 97.814923] [ T1842] <TASK>
[ 97.814988] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 97.815022] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 97.815123] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 97.815233] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 97.815320] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 97.815407] [ T1842] ? kfree+0x1d6/0x620
[ 97.815494] [ T1842] kobject_add_internal+0x26f/0x800
[ 97.815605] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.815669] [ T1842] kobject_add+0x139/0x1a0
[ 97.815734] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 97.815843] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 97.815888] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 97.815931] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 97.815998] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 97.816004] [ T1842] elevator_change_done+0x26f/0x690
[ 97.816105] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 97.816149] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 97.816237] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.816323] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.816367] [ T1842] elevator_change+0x283/0x4f0
[ 97.816454] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.816520] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 97.816564] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 97.816585] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 97.816672] [ T1842] ? lock_acquire+0x126/0x140
[ 97.816803] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.816847] [ T1842] queue_attr_store+0x23f/0x360
[ 97.816935] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 97.817002] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 97.817007] [ T1842] ? lock_release+0xfa/0x120
[ 97.817014] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 97.817052] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 97.817073] [ T1842] ? lock_acquire+0x126/0x140
[ 97.817139] [ T1842] ? lock_acquire+0x126/0x140
[ 97.817183] [ T1842] ? lock_release+0xfa/0x120
[ 97.817205] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 97.817269] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 97.817335] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 97.817400] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 97.817467] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 97.817509] [ T1842] vfs_write+0x524/0x1010
[ 97.817597] [ T1842] ? folio_xchg_last_cpupid+0xc6/0x130
[ 97.817667] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 97.817684] [ T1842] ? __pfx_folio_xchg_last_cpupid+0x10/0x10
[ 97.817772] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 97.817859] [ T1842] ? do_wp_page+0x57e/0xf40
[ 97.817926] [ T1842] ksys_write+0xff/0x200
[ 97.817989] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 97.818005] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 97.818033] [ T1842] do_syscall_64+0xf4/0x660
[ 97.818103] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 97.818143] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 97.818295] [ T1842] ? count_memcg_events+0x37f/0x480
[ 97.818405] [ T1842] ? lock_release+0xfa/0x120
[ 97.818471] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 97.818557] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 97.818624] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 97.818733] [ T1842] ? lock_release+0xfa/0x120
[ 97.818818] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 97.818885] [ T1842] ? irqentry_exit+0xb0/0x810
[ 97.818929] [ T1842] ? do_syscall_64+0x34/0x660
[ 97.818995] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 97.819000] [ T1842] ? irqentry_exit+0xb5/0x810
[ 97.819016] [ T1842] ? do_syscall_64+0xab/0x660
[ 97.819103] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 97.819169] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 97.819256] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 97.819300] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 97.819408] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 97.819452] [ T1842] RDX: 0000000000000004 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 97.819475] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 97.819539] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
[ 97.819543] [ T1842] R13: 0000000000000004 R14: 0000562ec532aa50 R15: 0000562ec53997a0
[ 97.819649] [ T1842] </TASK>
[ 98.701369] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 98.743363] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 98.753340] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 98.753346] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 98.753347] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 98.753349] [ T1842] Call Trace:
[ 98.753351] [ T1842] <TASK>
[ 98.753353] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 98.753362] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 98.753367] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 98.753373] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 98.753377] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 98.753381] [ T1842] ? kasan_save_track+0x14/0x30
[ 98.753385] [ T1842] ? kfree+0x1d6/0x620
[ 98.753388] [ T1842] kobject_add_internal+0x26f/0x800
[ 98.753395] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 98.753398] [ T1842] kobject_add+0x139/0x1a0
[ 98.753402] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 98.753406] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 98.753410] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 98.753413] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 98.753417] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 98.753420] [ T1842] elevator_change_done+0x26f/0x690
[ 98.753426] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 98.753429] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 98.753435] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 98.753439] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 98.753442] [ T1842] elevator_change+0x283/0x4f0
[ 98.753446] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 98.753449] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 98.753453] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 98.753456] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 98.753461] [ T1842] ? lock_acquire+0x126/0x140
[ 98.753466] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 98.753469] [ T1842] queue_attr_store+0x23f/0x360
[ 98.753473] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 98.753476] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 98.753479] [ T1842] ? lock_release+0xfa/0x120
[ 98.753482] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 98.753486] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 98.753490] [ T1842] ? lock_acquire+0x126/0x140
[ 98.753494] [ T1842] ? lock_acquire+0x126/0x140
[ 98.753497] [ T1842] ? lock_release+0xfa/0x120
[ 98.753501] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 98.753504] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 98.753508] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 98.753510] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 98.753514] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 98.753517] [ T1842] vfs_write+0x524/0x1010
[ 98.753521] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 98.753525] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 98.753528] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 98.753534] [ T1842] ? count_memcg_events+0x37f/0x480
[ 98.753540] [ T1842] ksys_write+0xff/0x200
[ 98.753543] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 98.753545] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 98.753550] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 98.753556] [ T1842] do_syscall_64+0xf4/0x660
[ 98.753561] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 98.753565] [ T1842] ? irqentry_exit+0xb0/0x810
[ 98.753567] [ T1842] ? do_syscall_64+0x34/0x660
[ 98.753571] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 98.753573] [ T1842] ? irqentry_exit+0xb5/0x810
[ 98.753576] [ T1842] ? do_syscall_64+0xab/0x660
[ 98.753579] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 98.753582] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 98.753585] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 98.753588] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 98.753592] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 98.753594] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 98.753596] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 98.753598] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 98.753599] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec5399990
[ 98.753604] [ T1842] </TASK>
[ 98.753610] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 99.221237] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 99.231263] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 99.231273] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 99.231275] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 99.231278] [ T1842] Call Trace:
[ 99.231280] [ T1842] <TASK>
[ 99.231283] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 99.231295] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 99.231355] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 99.231528] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 99.231594] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 99.231660] [ T1842] ? kfree+0x1d6/0x620
[ 99.231726] [ T1842] kobject_add_internal+0x26f/0x800
[ 99.231855] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 99.231921] [ T1842] kobject_add+0x139/0x1a0
[ 99.231965] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 99.232031] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 99.232039] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 99.232044] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 99.232081] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 99.232126] [ T1842] elevator_change_done+0x26f/0x690
[ 99.232234] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 99.232278] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 99.232387] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 99.232452] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 99.232496] [ T1842] elevator_change+0x283/0x4f0
[ 99.232583] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 99.232649] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 99.232715] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 99.232801] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 99.232888] [ T1842] ? lock_acquire+0x126/0x140
[ 99.232955] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 99.233019] [ T1842] queue_attr_store+0x23f/0x360
[ 99.233047] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 99.233052] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 99.233057] [ T1842] ? lock_release+0xfa/0x120
[ 99.233063] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 99.233070] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 99.233077] [ T1842] ? lock_acquire+0x126/0x140
[ 99.233082] [ T1842] ? lock_acquire+0x126/0x140
[ 99.233089] [ T1842] ? lock_release+0xfa/0x120
[ 99.233094] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 99.233100] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 99.233106] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 99.233163] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 99.233208] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 99.233228] [ T1842] vfs_write+0x524/0x1010
[ 99.233294] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 99.233381] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 99.233447] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 99.233584] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 99.233671] [ T1842] ksys_write+0xff/0x200
[ 99.233737] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 99.233824] [ T1842] do_syscall_64+0xf4/0x660
[ 99.233913] [ T1842] ? count_memcg_events+0x37f/0x480
[ 99.233977] [ T1842] ? lock_release+0xfa/0x120
[ 99.234023] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 99.234028] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 99.234045] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 99.234066] [ T1842] ? lock_release+0xfa/0x120
[ 99.234132] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 99.234197] [ T1842] ? irqentry_exit+0xb0/0x810
[ 99.234262] [ T1842] ? do_syscall_64+0x34/0x660
[ 99.234306] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 99.234328] [ T1842] ? irqentry_exit+0xb5/0x810
[ 99.234372] [ T1842] ? do_syscall_64+0xab/0x660
[ 99.234437] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 99.234524] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 99.234611] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 99.234676] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 99.234764] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 99.234808] [ T1842] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 99.234873] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 99.234895] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 99.234918] [ T1842] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5399ad0
[ 99.235027] [ T1842] </TASK>
[ 100.030097] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 100.109352] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 100.119423] [ T1842] CPU: 6 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 100.119434] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 100.119436] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 100.119439] [ T1842] Call Trace:
[ 100.119442] [ T1842] <TASK>
[ 100.119444] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 100.119468] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 100.119534] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 100.119665] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 100.119751] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 100.119817] [ T1842] ? kasan_save_track+0x14/0x30
[ 100.119882] [ T1842] ? kfree+0x1d6/0x620
[ 100.119948] [ T1842] kobject_add_internal+0x26f/0x800
[ 100.120035] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 100.120061] [ T1842] kobject_add+0x139/0x1a0
[ 100.120066] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 100.120105] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 100.120170] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 100.120216] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 100.120302] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 100.120346] [ T1842] elevator_change_done+0x26f/0x690
[ 100.120454] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 100.120498] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 100.120628] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 100.120695] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 100.120760] [ T1842] elevator_change+0x283/0x4f0
[ 100.120829] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 100.120891] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 100.120977] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 100.121022] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 100.121052] [ T1842] ? lock_acquire+0x126/0x140
[ 100.121153] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 100.121219] [ T1842] queue_attr_store+0x23f/0x360
[ 100.121306] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 100.121372] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 100.121437] [ T1842] ? lock_release+0xfa/0x120
[ 100.121524] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 100.121589] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 100.121676] [ T1842] ? lock_acquire+0x126/0x140
[ 100.121721] [ T1842] ? lock_acquire+0x126/0x140
[ 100.121765] [ T1842] ? lock_release+0xfa/0x120
[ 100.121808] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 100.121895] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 100.121940] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 100.122004] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 100.122053] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 100.122058] [ T1842] vfs_write+0x524/0x1010
[ 100.122137] [ T1842] ? ptep_set_access_flags+0xe5/0x130
[ 100.122203] [ T1842] ? __pfx_folio_xchg_last_cpupid+0x10/0x10
[ 100.122224] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 100.122289] [ T1842] ? __pfx_ptep_set_access_flags+0x10/0x10
[ 100.122349] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 100.122406] [ T1842] ? lock_release+0xfa/0x120
[ 100.122471] [ T1842] ? do_wp_page+0x57e/0xf40
[ 100.122536] [ T1842] ksys_write+0xff/0x200
[ 100.122561] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 100.122603] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 100.122646] [ T1842] ? fput_close_sync+0x137/0x1a0
[ 100.122755] [ T1842] do_syscall_64+0xf4/0x660
[ 100.122864] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 100.122911] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 100.123040] [ T1842] ? count_memcg_events+0x37f/0x480
[ 100.123049] [ T1842] ? lock_release+0xfa/0x120
[ 100.123083] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 100.123148] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 100.123193] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 100.123280] [ T1842] ? lock_release+0xfa/0x120
[ 100.123324] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 100.123367] [ T1842] ? irqentry_exit+0xb0/0x810
[ 100.123411] [ T1842] ? do_syscall_64+0x34/0x660
[ 100.123457] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 100.123542] [ T1842] ? irqentry_exit+0xb5/0x810
[ 100.123585] [ T1842] ? do_syscall_64+0xab/0x660
[ 100.123650] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 100.123737] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 100.123825] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 100.123890] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 100.123956] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 100.124021] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 100.124044] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 100.124047] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 100.124050] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec5394f20
[ 100.124110] [ T1842] </TASK>
[ 101.040053] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 101.115173] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 101.125215] [ T1842] CPU: 3 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 101.125222] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 101.125223] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 101.125225] [ T1842] Call Trace:
[ 101.125227] [ T1842] <TASK>
[ 101.125229] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 101.125238] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 101.125243] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 101.125249] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 101.125254] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 101.125258] [ T1842] ? kfree+0x1d6/0x620
[ 101.125262] [ T1842] kobject_add_internal+0x26f/0x800
[ 101.125268] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.125271] [ T1842] kobject_add+0x139/0x1a0
[ 101.125274] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 101.125278] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 101.125283] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 101.125285] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 101.125290] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 101.125293] [ T1842] elevator_change_done+0x26f/0x690
[ 101.125298] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 101.125301] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 101.125306] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.125310] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.125313] [ T1842] elevator_change+0x283/0x4f0
[ 101.125318] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.125321] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 101.125325] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 101.125328] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 101.125333] [ T1842] ? lock_acquire+0x126/0x140
[ 101.125338] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.125341] [ T1842] queue_attr_store+0x23f/0x360
[ 101.125345] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 101.125348] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 101.125351] [ T1842] ? lock_release+0xfa/0x120
[ 101.125355] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 101.125358] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 101.125363] [ T1842] ? lock_acquire+0x126/0x140
[ 101.125366] [ T1842] ? lock_acquire+0x126/0x140
[ 101.125370] [ T1842] ? lock_release+0xfa/0x120
[ 101.125373] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 101.125377] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 101.125380] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.125383] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 101.125387] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 101.125390] [ T1842] vfs_write+0x524/0x1010
[ 101.125394] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 101.125397] [ T1842] ? fput_close_sync+0x137/0x1a0
[ 101.125402] [ T1842] ? folio_xchg_last_cpupid+0xc6/0x130
[ 101.125406] [ T1842] ? do_syscall_64+0x1b9/0x660
[ 101.125410] [ T1842] ? ptep_set_access_flags+0xe5/0x130
[ 101.125414] [ T1842] ksys_write+0xff/0x200
[ 101.125418] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 101.125420] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 101.125424] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 101.125429] [ T1842] do_syscall_64+0xf4/0x660
[ 101.125432] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 101.125437] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 101.125440] [ T1842] ? trace_hardirqs_on_prepare+0x150/0x1a0
[ 101.125444] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 101.125446] [ T1842] ? do_syscall_64+0x1d7/0x660
[ 101.125451] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 101.125455] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 101.125462] [ T1842] ? count_memcg_events+0x37f/0x480
[ 101.125467] [ T1842] ? lock_release+0xfa/0x120
[ 101.125471] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 101.125474] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 101.125477] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 101.125482] [ T1842] ? lock_release+0xfa/0x120
[ 101.125485] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 101.125489] [ T1842] ? irqentry_exit+0xb0/0x810
[ 101.125492] [ T1842] ? do_syscall_64+0x34/0x660
[ 101.125495] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 101.125497] [ T1842] ? irqentry_exit+0xb5/0x810
[ 101.125500] [ T1842] ? do_syscall_64+0xab/0x660
[ 101.125504] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 101.125506] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 101.125510] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 101.125513] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 101.125517] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 101.125519] [ T1842] RDX: 0000000000000004 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 101.125521] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 101.125523] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
[ 101.125524] [ T1842] R13: 0000000000000004 R14: 0000562ec532aa50 R15: 0000562ec5382090
[ 101.125529] [ T1842] </TASK>
[ 101.125535] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 101.664224] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 101.675194] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 101.675208] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 101.675210] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 101.675212] [ T1842] Call Trace:
[ 101.675214] [ T1842] <TASK>
[ 101.675216] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 101.675236] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 101.675245] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 101.675253] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 101.675258] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 101.675277] [ T1842] ? kfree+0x1d6/0x620
[ 101.675282] [ T1842] kobject_add_internal+0x26f/0x800
[ 101.675296] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.675300] [ T1842] kobject_add+0x139/0x1a0
[ 101.675304] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 101.675318] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 101.675323] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 101.675326] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 101.675336] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 101.675340] [ T1842] elevator_change_done+0x26f/0x690
[ 101.675346] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 101.675353] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 101.675361] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.675366] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.675369] [ T1842] elevator_change+0x283/0x4f0
[ 101.675382] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.675385] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 101.675390] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 101.675394] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 101.675403] [ T1842] ? lock_acquire+0x126/0x140
[ 101.675409] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.675413] [ T1842] queue_attr_store+0x23f/0x360
[ 101.675424] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 101.675427] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 101.675431] [ T1842] ? lock_release+0xfa/0x120
[ 101.675435] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 101.675443] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 101.675447] [ T1842] ? lock_acquire+0x126/0x140
[ 101.675451] [ T1842] ? lock_acquire+0x126/0x140
[ 101.675455] [ T1842] ? lock_release+0xfa/0x120
[ 101.675463] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 101.675467] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 101.675471] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 101.675474] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 101.675479] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 101.675484] [ T1842] vfs_write+0x524/0x1010
[ 101.675489] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 101.675493] [ T1842] ? __pfx_locks_remove_posix+0x10/0x10
[ 101.675518] [ T1842] ksys_write+0xff/0x200
[ 101.675521] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 101.675524] [ T1842] ? __pfx_pte_val+0x10/0x10
[ 101.675529] [ T1842] do_syscall_64+0xf4/0x660
[ 101.675543] [ T1842] ? ptep_set_access_flags+0xe5/0x130
[ 101.675547] [ T1842] ? __pfx_folio_xchg_last_cpupid+0x10/0x10
[ 101.675553] [ T1842] ? __pfx_ptep_set_access_flags+0x10/0x10
[ 101.675558] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 101.675560] [ T1842] ? lock_release+0xfa/0x120
[ 101.675564] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 101.675567] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 101.675572] [ T1842] ? do_wp_page+0x57e/0xf40
[ 101.675583] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 101.675586] [ T1842] ? do_syscall_64+0x1d7/0x660
[ 101.675590] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 101.675592] [ T1842] ? do_syscall_64+0x1d7/0x660
[ 101.675601] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 101.675605] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 101.675609] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 101.675620] [ T1842] ? count_memcg_events+0x37f/0x480
[ 101.675629] [ T1842] ? lock_release+0xfa/0x120
[ 101.675633] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 101.675635] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 101.675639] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 101.675648] [ T1842] ? lock_release+0xfa/0x120
[ 101.675651] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 101.675655] [ T1842] ? irqentry_exit+0xb0/0x810
[ 101.675657] [ T1842] ? do_syscall_64+0x34/0x660
[ 101.675665] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 101.675673] [ T1842] ? irqentry_exit+0xb5/0x810
[ 101.675675] [ T1842] ? do_syscall_64+0xab/0x660
[ 101.675679] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 101.675692] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 101.675695] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 101.675698] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 101.675702] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 101.675707] [ T1842] RDX: 0000000000000004 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 101.675709] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 101.675710] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
[ 101.675712] [ T1842] R13: 0000000000000004 R14: 0000562ec532aa50 R15: 0000562ec5397e70
[ 101.675717] [ T1842] </TASK>
[ 101.675723] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 102.235777] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 102.245750] [ T1842] CPU: 4 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 102.245756] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 102.245757] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 102.245759] [ T1842] Call Trace:
[ 102.245761] [ T1842] <TASK>
[ 102.245763] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 102.245771] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 102.245776] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 102.245782] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 102.245786] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 102.245789] [ T1842] ? kasan_save_track+0x14/0x30
[ 102.245793] [ T1842] ? kfree+0x1d6/0x620
[ 102.245796] [ T1842] kobject_add_internal+0x26f/0x800
[ 102.245802] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.245805] [ T1842] kobject_add+0x139/0x1a0
[ 102.245808] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 102.245812] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 102.245816] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 102.245819] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 102.245823] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 102.245826] [ T1842] elevator_change_done+0x26f/0x690
[ 102.245831] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 102.245834] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 102.245839] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.245843] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.245846] [ T1842] elevator_change+0x283/0x4f0
[ 102.245850] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.245853] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 102.245856] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 102.245860] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 102.245865] [ T1842] ? lock_acquire+0x126/0x140
[ 102.245869] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.245872] [ T1842] queue_attr_store+0x23f/0x360
[ 102.245876] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 102.245879] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 102.245882] [ T1842] ? lock_release+0xfa/0x120
[ 102.245885] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 102.245889] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 102.245893] [ T1842] ? lock_acquire+0x126/0x140
[ 102.245896] [ T1842] ? lock_acquire+0x126/0x140
[ 102.245900] [ T1842] ? lock_release+0xfa/0x120
[ 102.245903] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 102.245906] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 102.245910] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.245913] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 102.245917] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 102.245919] [ T1842] vfs_write+0x524/0x1010
[ 102.245922] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 102.245926] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 102.245930] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 102.245936] [ T1842] ? count_memcg_events+0x37f/0x480
[ 102.245941] [ T1842] ksys_write+0xff/0x200
[ 102.245944] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 102.245947] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 102.245951] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 102.245957] [ T1842] do_syscall_64+0xf4/0x660
[ 102.245961] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 102.245964] [ T1842] ? irqentry_exit+0xb0/0x810
[ 102.245967] [ T1842] ? do_syscall_64+0x34/0x660
[ 102.245970] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 102.245973] [ T1842] ? irqentry_exit+0xb5/0x810
[ 102.245975] [ T1842] ? do_syscall_64+0xab/0x660
[ 102.245979] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 102.245982] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 102.245985] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 102.245987] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 102.245991] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 102.245993] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 102.245995] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 102.245997] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 102.245998] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec53929c0
[ 102.246003] [ T1842] </TASK>
[ 102.246009] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 102.718245] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 102.728223] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 102.728230] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 102.728231] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 102.728233] [ T1842] Call Trace:
[ 102.728235] [ T1842] <TASK>
[ 102.728237] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 102.728246] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 102.728251] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 102.728259] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 102.728263] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 102.728267] [ T1842] ? kfree+0x1d6/0x620
[ 102.728272] [ T1842] kobject_add_internal+0x26f/0x800
[ 102.728278] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.728282] [ T1842] kobject_add+0x139/0x1a0
[ 102.728285] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 102.728289] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 102.728293] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 102.728296] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 102.728301] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 102.728304] [ T1842] elevator_change_done+0x26f/0x690
[ 102.728310] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 102.728313] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 102.728319] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.728322] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.728325] [ T1842] elevator_change+0x283/0x4f0
[ 102.728329] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.728332] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 102.728336] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 102.728340] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 102.728345] [ T1842] ? lock_acquire+0x126/0x140
[ 102.728350] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.728353] [ T1842] queue_attr_store+0x23f/0x360
[ 102.728358] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 102.728361] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 102.728363] [ T1842] ? lock_release+0xfa/0x120
[ 102.728367] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 102.728371] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 102.728375] [ T1842] ? lock_acquire+0x126/0x140
[ 102.728379] [ T1842] ? lock_acquire+0x126/0x140
[ 102.728382] [ T1842] ? lock_release+0xfa/0x120
[ 102.728386] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 102.728389] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 102.728393] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 102.728395] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 102.728399] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 102.728402] [ T1842] vfs_write+0x524/0x1010
[ 102.728406] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 102.728409] [ T1842] ? filp_close+0x25/0x40
[ 102.728415] [ T1842] ? do_syscall_64+0x1b9/0x660
[ 102.728420] [ T1842] ? __pfx_pte_val+0x10/0x10
[ 102.728425] [ T1842] ksys_write+0xff/0x200
[ 102.728428] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 102.728430] [ T1842] ? lock_release+0xfa/0x120
[ 102.728434] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 102.728437] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 102.728441] [ T1842] do_syscall_64+0xf4/0x660
[ 102.728445] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 102.728450] [ T1842] ? do_syscall_64+0x1d7/0x660
[ 102.728453] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 102.728457] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 102.728459] [ T1842] ? __pfx_locks_remove_posix+0x10/0x10
[ 102.728465] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 102.728469] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 102.728477] [ T1842] ? count_memcg_events+0x37f/0x480
[ 102.728483] [ T1842] ? lock_release+0xfa/0x120
[ 102.728486] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 102.728489] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 102.728493] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 102.728497] [ T1842] ? lock_release+0xfa/0x120
[ 102.728501] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 102.728504] [ T1842] ? irqentry_exit+0xb0/0x810
[ 102.728507] [ T1842] ? do_syscall_64+0x34/0x660
[ 102.728510] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 102.728513] [ T1842] ? irqentry_exit+0xb5/0x810
[ 102.728515] [ T1842] ? do_syscall_64+0xab/0x660
[ 102.728519] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 102.728521] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 102.728525] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 102.728528] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 102.728532] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 102.728534] [ T1842] RDX: 000000000000000c RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 102.728536] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 102.728537] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
[ 102.728539] [ T1842] R13: 000000000000000c R14: 0000562ec532aa50 R15: 0000562ec5397300
[ 102.728544] [ T1842] </TASK>
[ 102.728549] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 103.292307] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 103.302399] [ T1842] CPU: 7 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 103.302408] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 103.302410] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 103.302422] [ T1842] Call Trace:
[ 103.302446] [ T1842] <TASK>
[ 103.302489] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 103.302728] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 103.302816] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 103.302990] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 103.303077] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 103.303124] [ T1842] ? kasan_save_track+0x14/0x30
[ 103.303129] [ T1842] ? kfree+0x1d6/0x620
[ 103.303135] [ T1842] kobject_add_internal+0x26f/0x800
[ 103.303258] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 103.303324] [ T1842] kobject_add+0x139/0x1a0
[ 103.303389] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 103.303476] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 103.303563] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 103.303629] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 103.303716] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 103.303782] [ T1842] elevator_change_done+0x26f/0x690
[ 103.303912] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 103.303978] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 103.304088] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 103.304114] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 103.304131] [ T1842] elevator_change+0x283/0x4f0
[ 103.304218] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 103.304262] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 103.304306] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 103.304349] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 103.304396] [ T1842] ? lock_acquire+0x126/0x140
[ 103.304481] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 103.304546] [ T1842] queue_attr_store+0x23f/0x360
[ 103.304612] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 103.304678] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 103.304699] [ T1842] ? lock_release+0xfa/0x120
[ 103.304785] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 103.304851] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 103.304960] [ T1842] ? lock_acquire+0x126/0x140
[ 103.305005] [ T1842] ? lock_acquire+0x126/0x140
[ 103.305091] [ T1842] ? lock_release+0xfa/0x120
[ 103.305117] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 103.305123] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 103.305129] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 103.305146] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 103.305211] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 103.305255] [ T1842] vfs_write+0x524/0x1010
[ 103.305279] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 103.305322] [ T1842] ? __pfx_pte_val+0x10/0x10
[ 103.305430] [ T1842] ? folio_xchg_last_cpupid+0xc6/0x130
[ 103.305539] [ T1842] ? __pfx_ptep_set_access_flags+0x10/0x10
[ 103.305649] [ T1842] ksys_write+0xff/0x200
[ 103.305715] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 103.305760] [ T1842] do_syscall_64+0xf4/0x660
[ 103.305802] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 103.305910] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 103.305934] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 103.305975] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 103.306106] [ T1842] ? count_memcg_events+0x37f/0x480
[ 103.306115] [ T1842] ? lock_release+0xfa/0x120
[ 103.306194] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 103.306260] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 103.306326] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 103.306434] [ T1842] ? lock_release+0xfa/0x120
[ 103.306478] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 103.306547] [ T1842] ? irqentry_exit+0xb0/0x810
[ 103.306609] [ T1842] ? do_syscall_64+0x34/0x660
[ 103.306674] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 103.306740] [ T1842] ? irqentry_exit+0xb5/0x810
[ 103.306783] [ T1842] ? do_syscall_64+0xab/0x660
[ 103.306870] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 103.306936] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 103.307023] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 103.307088] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 103.307114] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 103.307118] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 103.307133] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 103.307157] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 103.307179] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec5395360
[ 103.307215] [ T1842] </TASK>
[ 104.197683] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 104.269345] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 104.279320] [ T1842] CPU: 3 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 104.279326] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 104.279327] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 104.279329] [ T1842] Call Trace:
[ 104.279331] [ T1842] <TASK>
[ 104.279333] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 104.279341] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 104.279346] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 104.279352] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 104.279356] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 104.279360] [ T1842] ? kasan_save_track+0x14/0x30
[ 104.279363] [ T1842] ? kfree+0x1d6/0x620
[ 104.279367] [ T1842] kobject_add_internal+0x26f/0x800
[ 104.279372] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.279375] [ T1842] kobject_add+0x139/0x1a0
[ 104.279379] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 104.279383] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 104.279387] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 104.279390] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 104.279394] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 104.279397] [ T1842] elevator_change_done+0x26f/0x690
[ 104.279402] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 104.279404] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 104.279410] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.279413] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.279416] [ T1842] elevator_change+0x283/0x4f0
[ 104.279420] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.279423] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 104.279427] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 104.279430] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 104.279435] [ T1842] ? lock_acquire+0x126/0x140
[ 104.279440] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.279443] [ T1842] queue_attr_store+0x23f/0x360
[ 104.279446] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 104.279449] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 104.279452] [ T1842] ? lock_release+0xfa/0x120
[ 104.279456] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 104.279460] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 104.279464] [ T1842] ? lock_acquire+0x126/0x140
[ 104.279467] [ T1842] ? lock_acquire+0x126/0x140
[ 104.279471] [ T1842] ? lock_release+0xfa/0x120
[ 104.279474] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 104.279477] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 104.279481] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.279484] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 104.279487] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 104.279490] [ T1842] vfs_write+0x524/0x1010
[ 104.279494] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 104.279497] [ T1842] ? folio_xchg_last_cpupid+0xc6/0x130
[ 104.279501] [ T1842] ? ptep_set_access_flags+0xe5/0x130
[ 104.279505] [ T1842] ? __pfx_folio_xchg_last_cpupid+0x10/0x10
[ 104.279509] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 104.279511] [ T1842] ? lock_release+0xfa/0x120
[ 104.279515] [ T1842] ksys_write+0xff/0x200
[ 104.279518] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 104.279521] [ T1842] ? handle_pte_fault+0x54e/0x760
[ 104.279526] [ T1842] do_syscall_64+0xf4/0x660
[ 104.279530] [ T1842] ? __x64_sys_fcntl+0x10d/0x1c0
[ 104.279534] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 104.279538] [ T1842] ? trace_hardirqs_on_prepare+0x150/0x1a0
[ 104.279542] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 104.279546] [ T1842] ? kmem_cache_free+0x144/0x5f0
[ 104.279549] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 104.279556] [ T1842] ? count_memcg_events+0x37f/0x480
[ 104.279561] [ T1842] ? lock_release+0xfa/0x120
[ 104.279565] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 104.279568] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 104.279571] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 104.279576] [ T1842] ? lock_release+0xfa/0x120
[ 104.279579] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 104.279583] [ T1842] ? irqentry_exit+0xb0/0x810
[ 104.279585] [ T1842] ? do_syscall_64+0x34/0x660
[ 104.279588] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 104.279591] [ T1842] ? irqentry_exit+0xb5/0x810
[ 104.279593] [ T1842] ? do_syscall_64+0xab/0x660
[ 104.279597] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 104.279599] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 104.279603] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 104.279605] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 104.279609] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 104.279611] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 104.279613] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 104.279614] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 104.279616] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec5395470
[ 104.279621] [ T1842] </TASK>
[ 104.279626] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 104.808451] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 104.818469] [ T1842] CPU: 4 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 104.818479] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 104.818482] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 104.818485] [ T1842] Call Trace:
[ 104.818488] [ T1842] <TASK>
[ 104.818491] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 104.818502] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 104.818508] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 104.818514] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 104.818518] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 104.818522] [ T1842] ? kasan_save_track+0x14/0x30
[ 104.818525] [ T1842] ? kfree+0x1d6/0x620
[ 104.818528] [ T1842] kobject_add_internal+0x26f/0x800
[ 104.818534] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.818537] [ T1842] kobject_add+0x139/0x1a0
[ 104.818540] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 104.818544] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 104.818548] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 104.818551] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 104.818555] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 104.818558] [ T1842] elevator_change_done+0x26f/0x690
[ 104.818563] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 104.818566] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 104.818572] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.818575] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.818578] [ T1842] elevator_change+0x283/0x4f0
[ 104.818582] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.818585] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 104.818589] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 104.818592] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 104.818597] [ T1842] ? lock_acquire+0x126/0x140
[ 104.818602] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.818605] [ T1842] queue_attr_store+0x23f/0x360
[ 104.818609] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 104.818612] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 104.818614] [ T1842] ? lock_release+0xfa/0x120
[ 104.818618] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 104.818622] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 104.818626] [ T1842] ? lock_acquire+0x126/0x140
[ 104.818629] [ T1842] ? lock_acquire+0x126/0x140
[ 104.818633] [ T1842] ? lock_release+0xfa/0x120
[ 104.818636] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 104.818639] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 104.818643] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 104.818646] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 104.818649] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 104.818652] [ T1842] vfs_write+0x524/0x1010
[ 104.818656] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 104.818660] [ T1842] ? __pfx_pmd_val+0x10/0x10
[ 104.818664] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 104.818669] [ T1842] ksys_write+0xff/0x200
[ 104.818672] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 104.818675] [ T1842] ? count_memcg_events+0x37f/0x480
[ 104.818679] [ T1842] do_syscall_64+0xf4/0x660
[ 104.818684] [ T1842] ? lock_release+0xfa/0x120
[ 104.818688] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 104.818690] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 104.818694] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 104.818699] [ T1842] ? lock_release+0xfa/0x120
[ 104.818702] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 104.818706] [ T1842] ? irqentry_exit+0xb0/0x810
[ 104.818708] [ T1842] ? do_syscall_64+0x34/0x660
[ 104.818712] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 104.818715] [ T1842] ? irqentry_exit+0xb5/0x810
[ 104.818717] [ T1842] ? do_syscall_64+0xab/0x660
[ 104.818720] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 104.818723] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 104.818726] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 104.818729] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 104.818733] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 104.818735] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 104.818737] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 104.818739] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 104.818740] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec5397d90
[ 104.818745] [ T1842] </TASK>
[ 104.818750] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 105.300372] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 105.310342] [ T1842] CPU: 0 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 105.310349] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 105.310350] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 105.310352] [ T1842] Call Trace:
[ 105.310354] [ T1842] <TASK>
[ 105.310355] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 105.310364] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 105.310370] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 105.310376] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 105.310381] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 105.310384] [ T1842] ? kasan_save_track+0x14/0x30
[ 105.310388] [ T1842] ? kfree+0x1d6/0x620
[ 105.310392] [ T1842] kobject_add_internal+0x26f/0x800
[ 105.310398] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.310401] [ T1842] kobject_add+0x139/0x1a0
[ 105.310405] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 105.310409] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 105.310413] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 105.310416] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 105.310420] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 105.310423] [ T1842] elevator_change_done+0x26f/0x690
[ 105.310429] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 105.310432] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 105.310438] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.310442] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.310444] [ T1842] elevator_change+0x283/0x4f0
[ 105.310448] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.310451] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 105.310456] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 105.310459] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 105.310464] [ T1842] ? lock_acquire+0x126/0x140
[ 105.310469] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.310472] [ T1842] queue_attr_store+0x23f/0x360
[ 105.310477] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 105.310480] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 105.310482] [ T1842] ? lock_release+0xfa/0x120
[ 105.310486] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 105.310490] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 105.310494] [ T1842] ? lock_acquire+0x126/0x140
[ 105.310497] [ T1842] ? lock_acquire+0x126/0x140
[ 105.310501] [ T1842] ? lock_release+0xfa/0x120
[ 105.310504] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 105.310508] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 105.310511] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.310514] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 105.310518] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 105.310521] [ T1842] vfs_write+0x524/0x1010
[ 105.310524] [ T1842] ? folio_xchg_last_cpupid+0xc6/0x130
[ 105.310529] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 105.310531] [ T1842] ? __pfx_folio_xchg_last_cpupid+0x10/0x10
[ 105.310536] [ T1842] ? do_raw_spin_unlock+0x59/0x230
[ 105.310539] [ T1842] ? do_wp_page+0x57e/0xf40
[ 105.310544] [ T1842] ksys_write+0xff/0x200
[ 105.310547] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 105.310550] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 105.310555] [ T1842] do_syscall_64+0xf4/0x660
[ 105.310560] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 105.310564] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 105.310572] [ T1842] ? count_memcg_events+0x37f/0x480
[ 105.310578] [ T1842] ? lock_release+0xfa/0x120
[ 105.310582] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 105.310585] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 105.310589] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 105.310595] [ T1842] ? lock_release+0xfa/0x120
[ 105.310599] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 105.310602] [ T1842] ? irqentry_exit+0xb0/0x810
[ 105.310605] [ T1842] ? do_syscall_64+0x34/0x660
[ 105.310608] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 105.310611] [ T1842] ? irqentry_exit+0xb5/0x810
[ 105.310613] [ T1842] ? do_syscall_64+0xab/0x660
[ 105.310617] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 105.310619] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 105.310623] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 105.310626] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 105.310629] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 105.310632] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 105.310633] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 105.310635] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 105.310636] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec53956a0
[ 105.310641] [ T1842] </TASK>
[ 105.310646] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[ 105.851457] [ T1842] sysfs: cannot create duplicate filename '/devices/virtual/block/nullb1/queue/iosched'
[ 105.861445] [ T1842] CPU: 4 UID: 0 PID: 1842 Comm: check Tainted: G B D W 7.1.0-kts+ #57 PREEMPT(lazy)
[ 105.861456] [ T1842] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
[ 105.861458] [ T1842] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 105.861461] [ T1842] Call Trace:
[ 105.861464] [ T1842] <TASK>
[ 105.861467] [ T1842] dump_stack_lvl+0x6e/0xa0
[ 105.861479] [ T1842] sysfs_warn_dup.cold+0x17/0x24
[ 105.861484] [ T1842] sysfs_create_dir_ns+0x1fc/0x270
[ 105.861490] [ T1842] ? __pfx_sysfs_create_dir_ns+0x10/0x10
[ 105.861495] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 105.861499] [ T1842] ? kasan_save_track+0x14/0x30
[ 105.861502] [ T1842] ? kfree+0x1d6/0x620
[ 105.861506] [ T1842] kobject_add_internal+0x26f/0x800
[ 105.861511] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.861514] [ T1842] kobject_add+0x139/0x1a0
[ 105.861517] [ T1842] ? __blk_mq_unfreeze_queue+0x24/0x1a0
[ 105.861521] [ T1842] ? __pfx_kobject_add+0x10/0x10
[ 105.861526] [ T1842] ? __mutex_unlock_slowpath+0x15d/0x860
[ 105.861528] [ T1842] ? do_raw_spin_lock+0x128/0x270
[ 105.861532] [ T1842] ? __mutex_lock+0x2bc/0x25a0
[ 105.861535] [ T1842] elevator_change_done+0x26f/0x690
[ 105.861540] [ T1842] ? __pfx_elevator_change_done+0x10/0x10
[ 105.861543] [ T1842] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 105.861549] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.861552] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.861555] [ T1842] elevator_change+0x283/0x4f0
[ 105.861559] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.861562] [ T1842] elv_iosched_store+0x30c/0x3a0
[ 105.861566] [ T1842] ? __pfx_elv_iosched_store+0x10/0x10
[ 105.861569] [ T1842] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 105.861575] [ T1842] ? lock_acquire+0x126/0x140
[ 105.861579] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.861582] [ T1842] queue_attr_store+0x23f/0x360
[ 105.861586] [ T1842] ? __mutex_lock+0x1536/0x25a0
[ 105.861589] [ T1842] ? __pfx_queue_attr_store+0x10/0x10
[ 105.861592] [ T1842] ? lock_release+0xfa/0x120
[ 105.861595] [ T1842] ? __pfx___mutex_lock+0x10/0x10
[ 105.861599] [ T1842] ? __pfx__copy_from_iter+0x10/0x10
[ 105.861603] [ T1842] ? lock_acquire+0x126/0x140
[ 105.861606] [ T1842] ? lock_acquire+0x126/0x140
[ 105.861610] [ T1842] ? lock_release+0xfa/0x120
[ 105.861613] [ T1842] ? sysfs_file_kobj+0xb9/0x1b0
[ 105.861617] [ T1842] ? sysfs_kf_write+0x65/0x170
[ 105.861621] [ T1842] ? __pfx_sysfs_kf_write+0x10/0x10
[ 105.861623] [ T1842] kernfs_fop_write_iter+0x3da/0x5e0
[ 105.861627] [ T1842] ? __pfx_kernfs_fop_write_iter+0x10/0x10
[ 105.861630] [ T1842] vfs_write+0x524/0x1010
[ 105.861634] [ T1842] ? lock_release+0xfa/0x120
[ 105.861637] [ T1842] ? __pfx_vfs_write+0x10/0x10
[ 105.861639] [ T1842] ? wp_page_reuse+0x160/0x1e0
[ 105.861644] [ T1842] ? do_wp_page+0x57e/0xf40
[ 105.861649] [ T1842] ? __pfx_handle_pte_fault+0x10/0x10
[ 105.861653] [ T1842] ksys_write+0xff/0x200
[ 105.861656] [ T1842] ? __pfx_ksys_write+0x10/0x10
[ 105.861659] [ T1842] ? __handle_mm_fault+0xa02/0xef0
[ 105.861663] [ T1842] do_syscall_64+0xf4/0x660
[ 105.861667] [ T1842] ? __pfx___css_rstat_updated+0x10/0x10
[ 105.861674] [ T1842] ? count_memcg_events+0x37f/0x480
[ 105.861679] [ T1842] ? lock_release+0xfa/0x120
[ 105.861683] [ T1842] ? rcu_read_unlock+0x1c/0x60
[ 105.861685] [ T1842] ? handle_mm_fault+0x4d1/0x7d0
[ 105.861689] [ T1842] ? do_user_addr_fault+0x15d/0xed0
[ 105.861694] [ T1842] ? lock_release+0xfa/0x120
[ 105.861698] [ T1842] ? do_user_addr_fault+0x811/0xed0
[ 105.861701] [ T1842] ? irqentry_exit+0xb0/0x810
[ 105.861704] [ T1842] ? do_syscall_64+0x34/0x660
[ 105.861707] [ T1842] ? trace_hardirqs_on+0x19/0x1a0
[ 105.861710] [ T1842] ? irqentry_exit+0xb5/0x810
[ 105.861712] [ T1842] ? do_syscall_64+0xab/0x660
[ 105.861716] [ T1842] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 105.861719] [ T1842] RIP: 0033:0x7f96f4878bbe
[ 105.861722] [ T1842] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[ 105.861725] [ T1842] RSP: 002b:00007ffcb76ebbb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ 105.861729] [ T1842] RAX: ffffffffffffffda RBX: 00007f96f49f45c0 RCX: 00007f96f4878bbe
[ 105.861732] [ T1842] RDX: 0000000000000006 RSI: 0000562ec532aa50 RDI: 0000000000000001
[ 105.861734] [ T1842] RBP: 00007ffcb76ebbc0 R08: 0000000000000000 R09: 0000000000000000
[ 105.861735] [ T1842] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
[ 105.861737] [ T1842] R13: 0000000000000006 R14: 0000562ec532aa50 R15: 0000562ec53972c0
[ 105.861742] [ T1842] </TASK>
[ 105.861748] [ T1842] kobject: kobject_add_internal failed for iosched with -EEXIST, don't try to register things with the same name in the same directory.
[4] dmesg during the sysytem boot
...
[ 14.387131] [ T117] ata7.00: Features: HIPM DIPM NCQ-sndrcv NCQ-prio
[ 14.387200] [ T129] sd 4:0:0:0: [sda] 976773168 512-byte logical blocks: (500 GB/466 GiB)
[ 14.387319] [ T129] sd 4:0:0:0: [sda] Write Protect is off
[ 14.387370] [ T129] sd 4:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 14.387492] [ T129] sd 4:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 14.387696] [ T129] sd 4:0:0:0: [sda] Preferred minimum I/O size 512 bytes
[ 14.391829] [ T1] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 14.391835] [ T1] usb usb4: Product: xHCI Host Controller
[ 14.391837] [ T1] usb usb4: Manufacturer: Linux 7.1.0-kts+ xhci-hcd
[ 14.411827] [ T117] ata7.00: configured for UDMA/133
[ 14.417307] [ T1] usb usb4: SerialNumber: 0000:00:14.0
[ 14.417647] [ T129] ------------[ cut here ]------------
[ 14.417668] [ T129] WARNING: block/blk-mq-debugfs.c:621 at debugfs_create_files+0x162/0x210, CPU#7: kworker/u32:11/129
[ 14.417681] [ T129] Modules linked in:
[ 14.417694] [ T129] CPU: 7 UID: 0 PID: 129 Comm: kworker/u32:11 Not tainted 7.1.0-kts+ #57 PREEMPT(lazy)
[ 14.417698] [ T129] Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
[ 14.417701] [ T129] Workqueue: async async_run_entry_fn
[ 14.417708] [ T129] RIP: 0010:debugfs_create_files+0x162/0x210
[ 14.417713] [ T129] Code: 0f 85 aa 00 00 00 8b 15 e0 bc e1 03 85 d2 0f 84 0c ff ff ff 49 8d be 88 05 00 00 be ff ff ff ff e8 f3 ac a9 01 83 f8 01 75 02 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 89 ea 83 e5 07 48 c1 ea 03
[ 14.417716] [ T129] RSP: 0000:ffff88811750f648 EFLAGS: 00010246
[ 14.417720] [ T129] RAX: 0000000000000001 RBX: ffffffffaaffa7e0 RCX: 0000000000000000
[ 14.417723] [ T129] RDX: 0000000000000001 RSI: ffff888119603418 RDI: ffff888116521060
[ 14.417726] [ T129] RBP: ffffffffacf3cc24 R08: 0000000000000001 R09: ffffed10200b2365
[ 14.417729] [ T129] R10: ffffed10200b2366 R11: 0000000000000001 R12: ffff888100591a70
[ 14.417731] [ T129] R13: ffff888119602e90 R14: ffff888119602e90 R15: ffff888101ff5818
[ 14.417734] [ T129] FS: 0000000000000000(0000) GS:ffff8887b01c8000(0000) knlGS:0000000000000000
[ 14.417737] [ T129] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.417740] [ T129] CR2: 0000000000000000 CR3: 00000004f909c001 CR4: 00000000001706f0
[ 14.417743] [ T129] Call Trace:
[ 14.417745] [ T129] <TASK>
[ 14.417751] [ T129] blk_mq_sched_reg_debugfs+0x8d/0x1a0
[ 14.417761] [ T129] elevator_change_done+0x329/0x690
[ 14.417771] [ T129] ? __pfx_elevator_change_done+0x10/0x10
[ 14.417776] [ T129] ? __lock_release.isra.0+0x59/0x170
[ 14.417789] [ T129] elevator_change+0x283/0x4f0
[ 14.417798] [ T129] elevator_set_default+0x236/0x2e0
[ 14.417804] [ T129] ? __pfx_elevator_set_default+0x10/0x10
[ 14.417815] [ T129] ? disk_register_independent_access_ranges+0x24f/0x310
[ 14.417825] [ T129] blk_register_queue+0x412/0x5b0
[ 14.417837] [ T129] __add_disk+0x5fd/0xd50
[ 14.417843] [ T129] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 14.417847] [ T129] ? find_held_lock+0x2b/0x80
[ 14.417853] [ T129] add_disk_fwnode+0x113/0x590
[ 14.417863] [ T129] sd_probe+0x8b5/0xf90
[ 14.417873] [ T129] call_driver_probe+0x64/0x1e0
[ 14.417880] [ T129] really_probe+0x194/0x740
[ 14.417889] [ T129] ? __pfx___device_attach_driver+0x10/0x10
[ 14.417893] [ T129] __driver_probe_device+0x1cb/0x400
[ 14.417900] [ T129] driver_probe_device+0x4a/0x120
[ 14.417906] [ T129] __device_attach_driver+0x156/0x2a0
[ 14.417913] [ T129] bus_for_each_drv+0x114/0x1a0
[ 14.417917] [ T129] ? mark_held_locks+0x40/0x70
[ 14.417922] [ T129] ? __pfx_bus_for_each_drv+0x10/0x10
[ 14.417927] [ T129] ? trace_hardirqs_on+0x19/0x1a0
[ 14.417933] [ T129] ? _raw_spin_unlock_irqrestore+0x44/0x60
[ 14.417942] [ T129] __device_attach_async_helper+0x19f/0x250
[ 14.417948] [ T129] ? __pfx___device_attach_async_helper+0x10/0x10
[ 14.417953] [ T129] ? seqcount_lockdep_reader_access+0x94/0xb0
[ 14.417961] [ T129] ? ktime_get+0x35/0x1b0
[ 14.417965] [ T129] ? ktime_get+0x35/0x1b0
[ 14.417972] [ T129] async_run_entry_fn+0x97/0x550
[ 14.417979] [ T129] process_one_work+0x8b7/0x1650
[ 14.417995] [ T129] ? __pfx_process_one_work+0x10/0x10
[ 14.418073] [ T129] ? lock_acquire.part.0+0xb8/0x230
[ 14.418083] [ T129] ? lock_is_held_type+0x9a/0x110
[ 14.418096] [ T129] worker_thread+0x60a/0xff0
[ 14.418110] [ T129] ? __pfx_worker_thread+0x10/0x10
[ 14.418114] [ T129] kthread+0x35d/0x460
[ 14.418119] [ T129] ? _raw_spin_unlock_irq+0x28/0x50
[ 14.418124] [ T129] ? __pfx_kthread+0x10/0x10
[ 14.418130] [ T129] ret_from_fork+0x55b/0x850
[ 14.418137] [ T129] ? __pfx_ret_from_fork+0x10/0x10
[ 14.418144] [ T129] ? __switch_to+0x474/0xd80
[ 14.418148] [ T129] ? __switch_to_asm+0x39/0x70
[ 14.418153] [ T129] ? __switch_to_asm+0x33/0x70
[ 14.418157] [ T129] ? __pfx_kthread+0x10/0x10
[ 14.418163] [ T129] ret_from_fork_asm+0x1a/0x30
[ 14.418179] [ T129] </TASK>
[ 14.418181] [ T129] irq event stamp: 4509
[ 14.418183] [ T129] hardirqs last enabled at (4515): [<ffffffffa7dd11d5>] console_trylock_spinning+0x1c5/0x1f0
[ 14.418188] [ T129] hardirqs last disabled at (4520): [<ffffffffa7dd1188>] console_trylock_spinning+0x178/0x1f0
[ 14.418193] [ T129] softirqs last enabled at (4028): [<ffffffffa7bc5b91>] handle_softirqs+0x5c1/0x8b0
[ 14.418198] [ T129] softirqs last disabled at (4023): [<ffffffffa7bc5fe2>] __irq_exit_rcu+0x152/0x280
[ 14.418203] [ T129] ---[ end trace 0000000000000000 ]---
[ 14.445938] [ T84] usb 1-1: New USB device found, idVendor=8087, idProduct=8002, bcdDevice= 0.05
[ 14.456687] [ T1] hub 4-0:1.0: USB hub found
[ 14.460399] [ T84] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 14.468534] [ T1] hub 4-0:1.0: 6 ports detected
[ 14.477755] [ T129] sda: sda1 sda2 sda3
[ 14.478903] [ T84] hub 1-1:1.0: USB hub found
[ 14.479235] [ T84] hub 1-1:1.0: 8 ports detected
[ 14.500815] [ T14] Freeing initrd memory: 58856K
[ 14.511419] [ T129] sd 4:0:0:0: [sda] Attached SCSI disk
[ 14.591054] [ T1] usbcore: registered new interface driver usbserial_generic
[ 14.624054] [ T133] usb 3-1: new high-speed USB device number 2 using ehci-pci
[ 14.630659] [ T1] usbserial: USB Serial support registered for generic
[ 14.642060] [ T82] usb 2-12: new high-speed USB device number 2 using xhci_hcd
[ 14.647384] [ T1] i8042: PNP: No PS/2 controller found.
[ 14.783710] [ T82] usb 2-12: New USB device found, idVendor=0557, idProduct=7000, bcdDevice= 0.00
[ 14.788031] [ T1] mousedev: PS/2 mouse device common for all mice
[ 14.791695] [ T82] usb 2-12: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 14.798401] [ T1] rtc_cmos PNP0B00:00: RTC can wake from S4
[ 14.806361] [ T82] hub 2-12:1.0: USB hub found
[ 14.809380] [ T1] rtc_cmos PNP0B00:00: registered as rtc0
[ 14.811778] [ T82] hub 2-12:1.0: 4 ports detected
[ 14.816589] [ T1] rtc_cmos PNP0B00:00: setting system clock to 2026-06-24T11:36:20 UTC (1782300980)
[ 14.875529] [ T133] usb 3-1: New USB device found, idVendor=8087, idProduct=800a, bcdDevice=
...
next prev parent reply other threads:[~2026-06-24 11:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-23 1:32 [PATCH v2] block: serialize elevator changes for the same queue using a writer lock Shin'ichiro Kawasaki
2026-06-23 5:29 ` Nilay Shroff
2026-06-24 9:44 ` Ming Lei
2026-06-24 11:48 ` Shin'ichiro Kawasaki [this message]
2026-06-24 15:09 ` Ming Lei
2026-06-24 15:12 ` Ming Lei
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