* RE: kernel panics when hot removing U.2 nvme disk
2020-09-19 1:44 ` kernel panics when hot removing U.2 nvme disk Keith Busch
@ 2020-09-23 20:40 ` Meng Wang
2020-09-24 5:12 ` Christoph Hellwig
1 sibling, 0 replies; 5+ messages in thread
From: Meng Wang @ 2020-09-23 20:40 UTC (permalink / raw)
To: Keith Busch; +Cc: linux-nvme@lists.infradead.org, linux-ext4@vger.kernel.org
> -----Original Message-----
> From: Keith Busch <kbusch@kernel.org>
> Sent: Friday, September 18, 2020 6:44 PM
> To: Meng Wang <meng@hcdatainc.com>
> Cc: linux-nvme@lists.infradead.org; linux-ext4@vger.kernel.org
> Subject: Re: kernel panics when hot removing U.2 nvme disk
>
> On Fri, Sep 18, 2020 at 11:47:27PM +0000, Meng Wang wrote:
> > Hi,
> > We found kernel panics today when doing test on hot remove U.2 nvme
> > disk. After hot remove the nvme disk (formatted as ext4), the system
> > freezes and all services stuck. Lot of kernel message flushed the
> > syslog, including the CPU soft lockup, ext4 NULL point er dereferece
> > and ib nic transmission timeout. The kernel panics and configuration
> > are shown below. The used kernel is 5.4.0-050400-generic and OS is
> > Ubuntu 16.04. Not sure whether it's a known bug or configuration
> > error. Any advise are welcome.
>
> [cc'ing ext4 mailing list]
>
> The NULL dereference occured before the soft lockup, so I'm guessing the
> Oops'ed process is holding the same lock the removal task wants.
>
> Your kernel is a bit older, so it may be worth verifying if your observation still
> occurs on the current stable or current mainline, but the ext4 developers
> may have a better idea as this doesn't at least initially appear specific to nvme.
>
Hi,
I firstly reported this issue on linux-nvme mailing list and redirected to here. The issue is kernel oops on NULL pointer dereference after disk removal (Oops shown below). We firstly tested on kernel v5.4 and reproduced the same issue on the latest stable kernel v5.8.10. Due to this kernel dump, io from applications hang and cannot return with EIO. Is this a ext4 bug or compatibility issue with nvme disk? Thanks.
--------------------------------------------------------------------------
kernel v5.8.10 Oops on ext4 NULL pointer dereference
--------------------------------------------------------------------------
Sep 23 19:05:33 hcd56 kernel: [ 8050.166243] pcieport 0000:00:03.0: pciehp: Slot(7): Link Down
Sep 23 19:05:33 hcd56 kernel: [ 8050.166246] pcieport 0000:00:03.0: pciehp: Slot(7): Card not present
Sep 23 19:05:34 hcd56 kernel: [ 8050.249728] print_req_error: 312 callbacks suppressed
Sep 23 19:05:34 hcd56 kernel: [ 8050.249731] blk_update_request: I/O error, dev nvme2n2, sector 706037912 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Sep 23 19:05:34 hcd56 kernel: [ 8050.458068] VFS: busy inodes on changed media or resized disk nvme2n2
Sep 23 19:05:34 hcd56 kernel: [ 8050.467262] EXT4-fs error (device nvme2n2): ext4_wait_block_bitmap:519: comm w6_8_-1: Cannot read block bitmap - block_group = 87, block_bitmap = 2621447
Sep 23 19:05:34 hcd56 kernel: [ 8050.467320] EXT4-fs error (device nvme2n2): ext4_wait_block_bitmap:519: comm w6_10_-1: Cannot read block bitmap - block_group = 81, block_bitmap = 2621441
Sep 23 19:05:34 hcd56 kernel: [ 8050.467398] EXT4-fs error (device nvme2n2): ext4_wait_block_bitmap:519: comm w6_26_-1: Cannot read block bitmap - block_group = 90, block_bitmap = 2621450
Sep 23 19:05:34 hcd56 kernel: [ 8050.467416] EXT4-fs error (device nvme2n2): ext4_wait_block_bitmap:519: comm w6_42_-1: Cannot read block bitmap - block_group = 79, block_bitmap = 2097167
Sep 23 19:05:34 hcd56 kernel: [ 8050.467418] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467421] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467423] EXT4-fs error (device nvme2n2) in ext4_free_blocks:5217: IO failure
Sep 23 19:05:34 hcd56 kernel: [ 8050.467424] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467426] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467427] EXT4-fs (nvme2n2): previous I/O error to superblock detected
Sep 23 19:05:34 hcd56 kernel: [ 8050.467428] EXT4-fs error (device nvme2n2) in ext4_free_blocks:5217: IO failure
Sep 23 19:05:34 hcd56 kernel: [ 8050.467429] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467430] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467433] EXT4-fs error (device nvme2n2): ext4_check_bdev_write_error:215: comm w6_26_-1: Error while async write back metadata
Sep 23 19:05:34 hcd56 kernel: [ 8050.467434] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467435] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467438] EXT4-fs error (device nvme2n2): ext4_check_bdev_write_error:215: comm w6_42_-1: Error while async write back metadata
Sep 23 19:05:34 hcd56 kernel: [ 8050.467441] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467444] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467447] EXT4-fs error (device nvme2n2): ext4_check_bdev_write_error:215: comm w6_26_-1: Error while async write back metadata
Sep 23 19:05:34 hcd56 kernel: [ 8050.467449] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467450] EXT4-fs (nvme2n2): previous I/O error to superblock detected
Sep 23 19:05:34 hcd56 kernel: [ 8050.467455] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467456] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467456] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467458] EXT4-fs error (device nvme2n2): ext4_check_bdev_write_error:215: comm w6_26_-1: Error while async write back metadata
Sep 23 19:05:34 hcd56 kernel: [ 8050.467461] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467462] EXT4-fs (nvme2n2): I/O error while writing superblock
Sep 23 19:05:34 hcd56 kernel: [ 8050.467468] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467473] Buffer I/O error on dev nvme2n2, logical block 0, lost sync page write
Sep 23 19:05:34 hcd56 kernel: [ 8050.467863] JBD2: Spotted dirty metadata buffer (dev = nvme2n2, blocknr = 0). There's a risk of filesystem corruption in case of system crash.
Sep 23 19:05:35 hcd56 kernel: [ 8050.481231] BUG: kernel NULL pointer dereference, address: 000000000000000c
Sep 23 19:05:35 hcd56 kernel: [ 8050.740865] #PF: supervisor write access in kernel mode
Sep 23 19:05:35 hcd56 kernel: [ 8050.746080] #PF: error_code(0x0002) - not-present page
Sep 23 19:05:35 hcd56 kernel: [ 8050.751211] PGD 800000223fe5d067 P4D 800000223fe5d067 PUD 15cdaff067 PMD 0
Sep 23 19:05:35 hcd56 kernel: [ 8050.758164] Oops: 0002 [#1] SMP PTI
Sep 23 19:05:35 hcd56 kernel: [ 8050.761647] CPU: 36 PID: 4561 Comm: w6_8_-1 Tainted: G W 5.8.10-050810-generic #202009171232
Sep 23 19:05:35 hcd56 kernel: [ 8050.771370] Hardware name: Supermicro SYS-1028U-TN10RT+/X10DRU-i+, BIOS 3.1 06/08/2018
Sep 23 19:05:35 hcd56 kernel: [ 8050.779280] RIP: 0010:jbd2_journal_add_journal_head+0x93/0x120
Sep 23 19:05:35 hcd56 kernel: [ 8050.785106] Code: af f3 90 48 8b 13 f7 c2 00 00 40 00 75 f3 eb a0 48 8b 53 10 48 85 d2 74 07 48 83 7a 18 00 75 aa 0f 0b 48 8b 4b 40 48 8d 53 02 <83> 41 0c 01 f0 80 22 bf 48 85 c0 74 0f 48 8b 3d 19 a8 d2 01 48 89
Sep 23 19:05:35 hcd56 kernel: [ 8050.803844] RSP: 0018:ffffaf98e55479f8 EFLAGS: 00010206
Sep 23 19:05:35 hcd56 kernel: [ 8050.809060] RAX: 0000000000000000 RBX: ffff91744c78ed68 RCX: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8050.816187] RDX: ffff91744c78ed6a RSI: ffff91744c78ed68 RDI: ffff91744c78ed68
Sep 23 19:05:35 hcd56 kernel: [ 8050.823310] RBP: ffffaf98e5547a00 R08: ffffffff9ac05ee8 R09: 0000000000000028
Sep 23 19:05:35 hcd56 kernel: [ 8050.830433] R10: ffff916b3f01c714 R11: 0000000000000297 R12: ffff917484cad620
Sep 23 19:05:35 hcd56 kernel: [ 8050.837558] R13: 0000000000000000 R14: ffff91744c78ed68 R15: ffff91744c78ed68
Sep 23 19:05:35 hcd56 kernel: [ 8050.844681] FS: 00007fd3ebbff700(0000) GS:ffff917f3fc00000(0000) knlGS:0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8050.852759] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 23 19:05:35 hcd56 kernel: [ 8050.858496] CR2: 000000000000000c CR3: 0000002433d88005 CR4: 00000000003606e0
Sep 23 19:05:35 hcd56 kernel: [ 8050.865621] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8050.872745] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Sep 23 19:05:35 hcd56 kernel: [ 8050.879868] Call Trace:
Sep 23 19:05:35 hcd56 kernel: [ 8050.882321] jbd2_journal_get_write_access+0x53/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8050.887283] __ext4_journal_get_write_access+0x4e/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8050.892422] ext4_reserve_inode_write+0x97/0xc0
Sep 23 19:05:35 hcd56 kernel: [ 8050.896953] ? __ext4_ext_dirty+0x76/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8050.900956] __ext4_mark_inode_dirty+0x58/0x140
Sep 23 19:05:35 hcd56 kernel: [ 8050.905482] __ext4_ext_dirty+0x76/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8050.909318] ext4_ext_rm_leaf+0x237/0x6a0
Sep 23 19:05:35 hcd56 kernel: [ 8050.913326] ext4_ext_remove_space+0x44c/0x8e0
Sep 23 19:05:35 hcd56 kernel: [ 8050.917769] ext4_ext_truncate+0xa0/0xb0
Sep 23 19:05:35 hcd56 kernel: [ 8050.921687] ext4_truncate+0x2ed/0x450
Sep 23 19:05:35 hcd56 kernel: [ 8050.925432] ext4_da_write_begin+0x2ae/0x4b0
Sep 23 19:05:35 hcd56 kernel: [ 8050.929697] generic_perform_write+0xc2/0x1c0
Sep 23 19:05:35 hcd56 kernel: [ 8050.934055] ext4_buffered_write_iter+0xa4/0x160
Sep 23 19:05:35 hcd56 kernel: [ 8050.938664] ext4_file_write_iter+0x38/0x50
Sep 23 19:05:35 hcd56 kernel: [ 8050.942843] new_sync_write+0x111/0x1a0
Sep 23 19:05:35 hcd56 kernel: [ 8050.946674] vfs_write+0x1c5/0x200
Sep 23 19:05:35 hcd56 kernel: [ 8050.950070] ksys_write+0x67/0xe0
Sep 23 19:05:35 hcd56 kernel: [ 8050.953380] __x64_sys_write+0x1a/0x20
Sep 23 19:05:35 hcd56 kernel: [ 8050.957128] do_syscall_64+0x49/0xc0
Sep 23 19:05:35 hcd56 kernel: [ 8050.960704] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Sep 23 19:05:35 hcd56 kernel: [ 8050.965749] RIP: 0033:0x7fd52bcc32dd
Sep 23 19:05:35 hcd56 kernel: [ 8050.969319] Code: 24 2d 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 fe dd 01 00 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 47 de 01 00 48 89 d0 48 83 c4 08 48 3d 01
Sep 23 19:05:35 hcd56 kernel: [ 8050.988055] RSP: 002b:00007fd3ebbf30d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
Sep 23 19:05:35 hcd56 kernel: [ 8050.995613] RAX: ffffffffffffffda RBX: 0000000000000064 RCX: 00007fd52bcc32dd
Sep 23 19:05:35 hcd56 kernel: [ 8051.002738] RDX: 0000000000000064 RSI: 00007fd2c715a000 RDI: 00000000000001ad
Sep 23 19:05:35 hcd56 kernel: [ 8051.009860] RBP: 00007fd2c715a000 R08: 00007fd40c916d60 R09: 00007fd3ebbff700
Sep 23 19:05:35 hcd56 kernel: [ 8051.016985] R10: 7720646e756f7267 R11: 0000000000000293 R12: 0000000000000064
Sep 23 19:05:35 hcd56 kernel: [ 8051.024110] R13: 0000000000000001 R14: 00007fd40c916c80 R15: 00007fce49bd4fb0
Sep 23 19:05:35 hcd56 kernel: [ 8051.031234] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache ipmi_ssif intel_rapl_msr dax_pmem_compat device_dax nd_pmem dax_pmem_core nd_btt intel_rapl_common sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper rapl intel_cstate input_leds joydev mei_me lpc_ich mei ioatdma acpi_ipmi ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter nfit acpi_pad mac_hid iscsi_tcp libiscsi_tcp rdma_ucm sunrpc mlx4_ib ib_uverbs ib_umad ib_iser libiscsi scsi_transport_iscsi rdma_cm iw_cm ib_ipoib ib_cm ib_core parport_pc ppdev lp parport autofs4 btrfs blake2b_generic xor raid6_pq libcrc32c mlx4_en hid_generic usbhid hid ast drm_vram_helper drm_ttm_helper i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec rc_core sfc mlx4_core mtd ixgbe ahci drm xhci_pci xfrm_algo libahci nvme xhci_pci_renesas dca nvme_core mdio wmi
Sep 23 19:05:35 hcd56 kernel: [ 8051.116665] CR2: 000000000000000c
Sep 23 19:05:35 hcd56 kernel: [ 8051.119984] ---[ end trace 13b327955bd11f5f ]---
Sep 23 19:05:35 hcd56 kernel: [ 8051.119986] BUG: kernel NULL pointer dereference, address: 000000000000000c
Sep 23 19:05:35 hcd56 kernel: [ 8051.119987] #PF: supervisor write access in kernel mode
Sep 23 19:05:35 hcd56 kernel: [ 8051.129900] RIP: 0010:jbd2_journal_add_journal_head+0x93/0x120
Sep 23 19:05:35 hcd56 kernel: [ 8051.131898] #PF: error_code(0x0002) - not-present page
Sep 23 19:05:35 hcd56 kernel: [ 8051.137116] Code: af f3 90 48 8b 13 f7 c2 00 00 40 00 75 f3 eb a0 48 8b 53 10 48 85 d2 74 07 48 83 7a 18 00 75 aa 0f 0b 48 8b 4b 40 48 8d 53 02 <83> 41 0c 01 f0 80 22 bf 48 85 c0 74 0f 48 8b 3d 19 a8 d2 01 48 89
Sep 23 19:05:35 hcd56 kernel: [ 8051.142940] PGD 800000223fe5d067 P4D 800000223fe5d067 PUD 15cdaff067 PMD 0
Sep 23 19:05:35 hcd56 kernel: [ 8051.148070] RSP: 0018:ffffaf98e55479f8 EFLAGS: 00010206
Sep 23 19:05:35 hcd56 kernel: [ 8051.166808] Oops: 0002 [#2] SMP PTI
Sep 23 19:05:35 hcd56 kernel: [ 8051.173765] RAX: 0000000000000000 RBX: ffff91744c78ed68 RCX: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.178988] CPU: 19 PID: 4563 Comm: w6_10_-1 Tainted: G D W 5.8.10-050810-generic #202009171232
Sep 23 19:05:35 hcd56 kernel: [ 8051.182468] RDX: ffff91744c78ed6a RSI: ffff91744c78ed68 RDI: ffff91744c78ed68
Sep 23 19:05:35 hcd56 kernel: [ 8051.182469] RBP: ffffaf98e5547a00 R08: ffffffff9ac05ee8 R09: 0000000000000028
Sep 23 19:05:35 hcd56 kernel: [ 8051.189591] Hardware name: Supermicro SYS-1028U-TN10RT+/X10DRU-i+, BIOS 3.1 06/08/2018
Sep 23 19:05:35 hcd56 kernel: [ 8051.199403] R10: ffff916b3f01c714 R11: 0000000000000297 R12: ffff917484cad620
Sep 23 19:05:35 hcd56 kernel: [ 8051.206533] RIP: 0010:jbd2_journal_add_journal_head+0x93/0x120
Sep 23 19:05:35 hcd56 kernel: [ 8051.213652] R13: 0000000000000000 R14: ffff91744c78ed68 R15: ffff91744c78ed68
Sep 23 19:05:35 hcd56 kernel: [ 8051.221557] Code: af f3 90 48 8b 13 f7 c2 00 00 40 00 75 f3 eb a0 48 8b 53 10 48 85 d2 74 07 48 83 7a 18 00 75 aa 0f 0b 48 8b 4b 40 48 8d 53 02 <83> 41 0c 01 f0 80 22 bf 48 85 c0 74 0f 48 8b 3d 19 a8 d2 01 48 89
Sep 23 19:05:35 hcd56 kernel: [ 8051.228680] FS: 00007fd3ebbff700(0000) GS:ffff917f3fc00000(0000) knlGS:0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.234504] RSP: 0018:ffffaf98e55579f8 EFLAGS: 00010206
Sep 23 19:05:35 hcd56 kernel: [ 8051.241628] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 23 19:05:35 hcd56 kernel: [ 8051.260364] RAX: 0000000000000000 RBX: ffff91744c78e0d0 RCX: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.260366] RDX: ffff91744c78e0d2 RSI: ffff91744c78e0d0 RDI: ffff91744c78e0d0
Sep 23 19:05:35 hcd56 kernel: [ 8051.268442] CR2: 000000000000000c CR3: 0000002433d88005 CR4: 00000000003606e0
Sep 23 19:05:35 hcd56 kernel: [ 8051.273660] RBP: ffffaf98e5557a00 R08: ffff91744c78e0d0 R09: 0000000000001000
Sep 23 19:05:35 hcd56 kernel: [ 8051.279397] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.279399] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Sep 23 19:05:35 hcd56 kernel: [ 8051.286521] R10: ffff916b3f01c714 R11: 0000000000000157 R12: ffff9174d8d26508
Sep 23 19:05:35 hcd56 kernel: [ 8051.286523] R13: 0000000000000000 R14: ffff91744c78e0d0 R15: ffff91744c78e0d0
Sep 23 19:05:35 hcd56 kernel: [ 8051.336392] FS: 00007fd3e6fff700(0000) GS:ffff917f3fa40000(0000) knlGS:0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.344468] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 23 19:05:35 hcd56 kernel: [ 8051.350203] CR2: 000000000000000c CR3: 0000002433d88001 CR4: 00000000003606e0
Sep 23 19:05:35 hcd56 kernel: [ 8051.357328] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.364452] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Sep 23 19:05:35 hcd56 kernel: [ 8051.371578] Call Trace:
Sep 23 19:05:35 hcd56 kernel: [ 8051.374031] jbd2_journal_get_write_access+0x53/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8051.378989] __ext4_journal_get_write_access+0x4e/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8051.384120] ext4_reserve_inode_write+0x97/0xc0
Sep 23 19:05:35 hcd56 kernel: [ 8051.388641] ? __ext4_ext_dirty+0x76/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8051.392654] __ext4_mark_inode_dirty+0x58/0x140
Sep 23 19:05:35 hcd56 kernel: [ 8051.397187] __ext4_ext_dirty+0x76/0x90
Sep 23 19:05:35 hcd56 kernel: [ 8051.401025] ext4_ext_rm_leaf+0x237/0x6a0
Sep 23 19:05:35 hcd56 kernel: [ 8051.405043] ext4_ext_remove_space+0x44c/0x8e0
Sep 23 19:05:35 hcd56 kernel: [ 8051.409494] ext4_ext_truncate+0xa0/0xb0
Sep 23 19:05:35 hcd56 kernel: [ 8051.413420] ext4_truncate+0x2ed/0x450
Sep 23 19:05:35 hcd56 kernel: [ 8051.417173] ext4_da_write_begin+0x2ae/0x4b0
Sep 23 19:05:35 hcd56 kernel: [ 8051.421447] generic_perform_write+0xc2/0x1c0
Sep 23 19:05:35 hcd56 kernel: [ 8051.425819] ext4_buffered_write_iter+0xa4/0x160
Sep 23 19:05:35 hcd56 kernel: [ 8051.430445] ext4_file_write_iter+0x38/0x50
Sep 23 19:05:35 hcd56 kernel: [ 8051.434637] new_sync_write+0x111/0x1a0
Sep 23 19:05:35 hcd56 kernel: [ 8051.438485] vfs_write+0x1c5/0x200
Sep 23 19:05:35 hcd56 kernel: [ 8051.441886] ksys_write+0x67/0xe0
Sep 23 19:05:35 hcd56 kernel: [ 8051.445206] __x64_sys_write+0x1a/0x20
Sep 23 19:05:35 hcd56 kernel: [ 8051.448961] do_syscall_64+0x49/0xc0
Sep 23 19:05:35 hcd56 kernel: [ 8051.452543] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Sep 23 19:05:35 hcd56 kernel: [ 8051.457602] RIP: 0033:0x7fd52bcc32dd
Sep 23 19:05:35 hcd56 kernel: [ 8051.461180] Code: 24 2d 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 fe dd 01 00 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 47 de 01 00 48 89 d0 48 83 c4 08 48 3d 01
Sep 23 19:05:35 hcd56 kernel: [ 8051.479923] RSP: 002b:00007fd3e6ff30d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
Sep 23 19:05:35 hcd56 kernel: [ 8051.487488] RAX: ffffffffffffffda RBX: 0000000000000064 RCX: 00007fd52bcc32dd
Sep 23 19:05:35 hcd56 kernel: [ 8051.494620] RDX: 0000000000000064 RSI: 00007fcf3dbff000 RDI: 0000000000000216
Sep 23 19:05:35 hcd56 kernel: [ 8051.501747] RBP: 00007fcf3dbff000 R08: 00007fd416d18160 R09: 00007fd3e6fff700
Sep 23 19:05:35 hcd56 kernel: [ 8051.508877] R10: 7720646e756f7267 R11: 0000000000000293 R12: 0000000000000064
Sep 23 19:05:35 hcd56 kernel: [ 8051.516011] R13: 0000000000000001 R14: 00007fd416d18080 R15: 00007fd2da165e70
Sep 23 19:05:35 hcd56 kernel: [ 8051.523147] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache ipmi_ssif intel_rapl_msr dax_pmem_compat device_dax nd_pmem dax_pmem_core nd_btt intel_rapl_common sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper rapl intel_cstate input_leds joydev mei_me lpc_ich mei ioatdma acpi_ipmi ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter nfit acpi_pad mac_hid iscsi_tcp libiscsi_tcp rdma_ucm sunrpc mlx4_ib ib_uverbs ib_umad ib_iser libiscsi scsi_transport_iscsi rdma_cm iw_cm ib_ipoib ib_cm ib_core parport_pc ppdev lp parport autofs4 btrfs blake2b_generic xor raid6_pq libcrc32c mlx4_en hid_generic usbhid hid ast drm_vram_helper drm_ttm_helper i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec rc_core sfc mlx4_core mtd ixgbe ahci drm xhci_pci xfrm_algo libahci nvme xhci_pci_renesas dca nvme_core mdio wmi
Sep 23 19:05:35 hcd56 kernel: [ 8051.608601] CR2: 000000000000000c
Sep 23 19:05:35 hcd56 kernel: [ 8051.611915] ---[ end trace 13b327955bd11f60 ]---
Sep 23 19:05:35 hcd56 kernel: [ 8051.621848] RIP: 0010:jbd2_journal_add_journal_head+0x93/0x120
Sep 23 19:05:35 hcd56 kernel: [ 8051.627672] Code: af f3 90 48 8b 13 f7 c2 00 00 40 00 75 f3 eb a0 48 8b 53 10 48 85 d2 74 07 48 83 7a 18 00 75 aa 0f 0b 48 8b 4b 40 48 8d 53 02 <83> 41 0c 01 f0 80 22 bf 48 85 c0 74 0f 48 8b 3d 19 a8 d2 01 48 89
Sep 23 19:05:35 hcd56 kernel: [ 8051.646406] RSP: 0018:ffffaf98e55479f8 EFLAGS: 00010206
Sep 23 19:05:35 hcd56 kernel: [ 8051.651623] RAX: 0000000000000000 RBX: ffff91744c78ed68 RCX: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.658749] RDX: ffff91744c78ed6a RSI: ffff91744c78ed68 RDI: ffff91744c78ed68
Sep 23 19:05:35 hcd56 kernel: [ 8051.665872] RBP: ffffaf98e5547a00 R08: ffffffff9ac05ee8 R09: 0000000000000028
Sep 23 19:05:35 hcd56 kernel: [ 8051.672996] R10: ffff916b3f01c714 R11: 0000000000000297 R12: ffff917484cad620
Sep 23 19:05:35 hcd56 kernel: [ 8051.680120] R13: 0000000000000000 R14: ffff91744c78ed68 R15: ffff91744c78ed68
Sep 23 19:05:35 hcd56 kernel: [ 8051.687246] FS: 00007fd3e6fff700(0000) GS:ffff917f3fa40000(0000) knlGS:0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.695322] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 23 19:05:35 hcd56 kernel: [ 8051.701060] CR2: 000000000000000c CR3: 0000002433d88001 CR4: 00000000003606e0
Sep 23 19:05:35 hcd56 kernel: [ 8051.708183] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 23 19:05:35 hcd56 kernel: [ 8051.715308] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
> > ------------------------------------------------------
> > kernel panic snippet on cpu soft lockup
> > ------------------------------------------------------
> > Sep 18 21:27:27 hcd56 kernel: [88463.800033] watchdog: BUG: soft
> > lockup - CPU#38 stuck for 23s! [irq/27-pciehp:416] Sep 18 21:27:27
> > hcd56 kernel: [88463.804076] ib0: transmit timeout: latency 20428
> > msecs Sep 18 21:27:27 hcd56 kernel: [88463.807609] Modules linked in:
> rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache ipmi_ssif
> intel_rapl_msr intel_rapl_common sb_edac x86_pkg_temp_thermal
> intel_powerclamp coretemp kvm_intel kvm irqbypass dax_pmem_compat
> device_dax nd_pmem dax_pmem_core nd_btt crct10dif_pclmul
> crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd
> glue_helper intel_cstate input_leds intel_rapl_perf joydev mei_me mei
> lpc_ich ioatdma ipmi_si ipmi_devintf ipmi_msghandler nfit
> acpi_power_meter acpi_pad mac_hid iscsi_tcp libiscsi_tcp rdma_ucm
> mlx4_ib sunrpc ib_uverbs ib_umad ib_iser rdma_cm iw_cm libiscsi
> scsi_transport_iscsi ib_ipoib ib_cm ib_core parport_pc ppdev lp parport
> autofs4 btrfs xor zstd_compress raid6_pq libcrc32c mlx4_en hid_generic
> usbhid hid ast drm_vram_helper i2c_algo_bit ttm drm_kms_helper
> syscopyarea sysfillrect sysimgblt fb_sys_fops sfc mlx4_core mtd ixgbe drm
> ahci nvme xfrm_algo libahci nvme_core dca mdio wmi Sep 18 21:27:27 hcd56
> kernel: [88463.812748] ib0: queue stopped 1, tx_head 7638106, tx_tail
> 7637978
> > Sep 18 21:27:27 hcd56 kernel: [88463.894312] CPU: 38 PID: 416 Comm:
> irq/27-pciehp Tainted: G D W 5.4.0-050400-generic #201911242031
> > Sep 18 21:27:27 hcd56 kernel: [88463.894313] Hardware name: Supermicro
> > SYS-1028U-TN10RT+/X10DRU-i+, BIOS 3.1 06/08/2018 Sep 18 21:27:27 hcd56
> > kernel: [88463.894329] RIP:
> > 0010:native_queued_spin_lock_slowpath+0x62/0x1d0
> > Sep 18 21:27:27 hcd56 kernel: [88463.894331] Code: 0f ba 2f 08 0f 92
> > c0 0f b6 c0 c1 e0 08 89 c2 8b 07 30 e4 09 d0 a9 00 01 ff ff 75 48 85
> > c0 74 0e 8b 07 84 c0 74 08 f3 90 8b 07 <84> c0 75 f8 b8 01 00 00 00 5d
> > 66 89 07 c3 8b 37 81 fe 00 01 00 00 Sep 18 21:27:27 hcd56 kernel:
> > [88463.894332] RSP: 0000:ffffb1da46eefa40 EFLAGS: 00000202 ORIG_RAX:
> > ffffffffffffff13 Sep 18 21:27:27 hcd56 kernel: [88463.894334] RAX:
> > 0000000000000101 RBX: ffff9717c9abe380 RCX: ffffb1da46eefa9c Sep 18
> > 21:27:27 hcd56 kernel: [88463.894334] RDX: 0000000000000000 RSI:
> > 0000000000000000 RDI: ffff9701e12d7b88 Sep 18 21:27:27 hcd56 kernel:
> > [88463.894335] RBP: ffffb1da46eefa40 R08: ffffb1da46eef918 R09:
> > 0000000000000000 Sep 18 21:27:27 hcd56 kernel: [88463.894336] R10:
> > 0000000000000001 R11: ffff97183ffd4000 R12: ffff9717f9da0528 Sep 18
> > 21:27:27 hcd56 kernel: [88463.894336] R13: ffff9701e12d7b88 R14:
> ffff9703fa860000 R15: ffff9717f9da0630 Sep 18 21:27:27 hcd56 kernel:
> [88463.894337] FS: 0000000000000000(0000) GS:ffff9717ffa80000(0000)
> knlGS:0000000000000000 Sep 18 21:27:27 hcd56 kernel: [88463.894338] CS:
> 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Sep 18 21:27:27 hcd56 kernel:
> [88463.894339] CR2: 00007fdd7bb3c000 CR3: 000000103564c002 CR4:
> 00000000003606e0 Sep 18 21:27:27 hcd56 kernel: [88463.894340] DR0:
> 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Sep 18
> 21:27:27 hcd56 kernel: [88463.894340] DR3: 0000000000000000 DR6:
> 00000000fffe0ff0 DR7: 0000000000000400 Sep 18 21:27:27 hcd56 kernel:
> [88463.894341] Call Trace:
> > Sep 18 21:27:27 hcd56 kernel: [88463.894359] _raw_spin_lock+0x1e/0x30
> > Sep 18 21:27:27 hcd56 kernel: [88463.894376]
> > jbd2_journal_release_jbd_inode+0xb7/0x120
> > Sep 18 21:27:27 hcd56 kernel: [88464.032946] ?
> > ext4_es_remove_extent+0x82/0x100 Sep 18 21:27:27 hcd56 kernel:
> > [88464.037480] ext4_clear_inode+0x5f/0xa0 Sep 18 21:27:27 hcd56
> > kernel: [88464.041318] ext4_evict_inode+0x60/0x5b0 Sep 18 21:27:27
> > hcd56 kernel: [88464.045234] evict+0xd2/0x1b0 Sep 18 21:27:27 hcd56
> > kernel: [88464.048196] dispose_list+0x39/0x50 Sep 18 21:27:27 hcd56
> > kernel: [88464.051680] invalidate_inodes+0x160/0x190 Sep 18 21:27:27
> > hcd56 kernel: [88464.055773] ? irq_finalize_oneshot.part.0+0xf0/0xf0
> > Sep 18 21:27:27 hcd56 kernel: [88464.060730]
> > __invalidate_device+0x38/0x60 Sep 18 21:27:27 hcd56 kernel:
> > [88464.064822] invalidate_partition+0x32/0x50 Sep 18 21:27:27 hcd56
> > kernel: [88464.069006] del_gendisk+0x117/0x2f0 Sep 18 21:27:27 hcd56
> > kernel: [88464.072582] nvme_ns_remove+0xf6/0x140 [nvme_core] Sep 18
> > 21:27:27 hcd56 kernel: [88464.077371]
> > nvme_remove_namespaces+0x9f/0xe0 [nvme_core] Sep 18 21:27:27
> hcd56
> > kernel: [88464.082760] nvme_remove+0x66/0x170 [nvme] Sep 18 21:27:27
> > hcd56 kernel: [88464.086853] pci_device_remove+0x3e/0xb0 Sep 18
> > 21:27:27 hcd56 kernel: [88464.090770]
> > device_release_driver_internal+0xf0/0x1c0
> > Sep 18 21:27:27 hcd56 kernel: [88464.095898]
> > device_release_driver+0x12/0x20 Sep 18 21:27:27 hcd56 kernel:
> > [88464.100165] pci_stop_bus_device+0x70/0xa0 Sep 18 21:27:27 hcd56
> > kernel: [88464.104253] pci_stop_and_remove_bus_device+0x13/0x20
> > Sep 18 21:27:27 hcd56 kernel: [88464.109301]
> > pciehp_unconfigure_device+0x80/0x12f
> > Sep 18 21:27:27 hcd56 kernel: [88464.114004]
> > pciehp_disable_slot+0x6e/0x100 Sep 18 21:27:27 hcd56 kernel:
> > [88464.118182] pciehp_handle_presence_or_link_change+0xe1/0x150
> > Sep 18 21:27:27 hcd56 kernel: [88464.123919] pciehp_ist+0x122/0x130
> > Sep 18 21:27:27 hcd56 kernel: [88464.127401] irq_thread_fn+0x28/0x60
> > Sep 18 21:27:27 hcd56 kernel: [88464.130973] irq_thread+0xda/0x170
> > Sep 18 21:27:27 hcd56 kernel: [88464.134369] ?
> > irq_forced_thread_fn+0x80/0x80 Sep 18 21:27:27 hcd56 kernel:
> > [88464.138724] kthread+0x104/0x140 Sep 18 21:27:27 hcd56 kernel:
> > [88464.141953] ? irq_thread_check_affinity+0xf0/0xf0
> > Sep 18 21:27:27 hcd56 kernel: [88464.146736] ? kthread_park+0x90/0x90
> > Sep 18 21:27:27 hcd56 kernel: [88464.150397] ret_from_fork+0x35/0x40
> >
> > ---------------------------------------------------------------
> > kernel panic on ext4 NULL pointer dereference
> > ---------------------------------------------------------------
> > Sep 18 21:27:00 hcd56 kernel: [88437.232231] VFS: busy inodes on
> > changed media or resized disk nvme0n2 Sep 18 21:27:01 hcd56 kernel:
> [88437.577487] Aborting journal on device nvme0n2-8.
> > Sep 18 21:27:01 hcd56 kernel: [88437.582192] JBD2: Error -5 detected when
> updating journal superblock for nvme0n2-8.
> > Sep 18 21:27:01 hcd56 kernel: [88437.589853] BUG: kernel NULL pointer
> > dereference, address: 0000000000000008 Sep 18 21:27:01 hcd56 kernel:
> > [88437.596808] #PF: supervisor write access in kernel mode Sep 18
> > 21:27:01 hcd56 kernel: [88437.602026] #PF: error_code(0x0002) -
> > not-present page Sep 18 21:27:01 hcd56 kernel: [88437.607157] PGD
> 8000000b59cba067 P4D 8000000b59cba067 PUD fa8d3d067 PMD 0 Sep 18
> 21:27:01 hcd56 kernel: [88437.614021] Oops: 0002 [#1] SMP PTI
> > Sep 18 21:27:01 hcd56 kernel: [88437.617505] CPU: 31 PID: 3660 Comm:
> jbd2/nvme0n2-8 Tainted: G W 5.4.0-050400-generic #201911242031
> > Sep 18 21:27:01 hcd56 kernel: [88437.627781] Hardware name: Supermicro
> > SYS-1028U-TN10RT+/X10DRU-i+, BIOS 3.1 06/08/2018 Sep 18 21:27:01 hcd56
> > kernel: [88437.635694] RIP:
> > 0010:jbd2_journal_grab_journal_head+0x22/0x40
> > Sep 18 21:27:01 hcd56 kernel: [88437.641522] Code: eb e7 66 0f 1f 44
> > 00 00 0f 1f 44 00 00 55 48 89 e5 f0 48 0f ba 2f 18 72 1c 48 8b 17 31
> > c0 f7 c2 00 00 02 00 74 08 48 8b 47 40 <83> 40 08 01 f0 80 67 03 fe 5d
> > c3 f3 90 48 8b
> > 07 a9 00 00 00 01 75
> > Sep 18 21:27:01 hcd56 kernel: [88437.660259] RSP:
> > 0018:ffffb1da4a17fce0 EFLAGS: 00010206 Sep 18 21:27:01 hcd56 kernel:
> > [88437.665475] RAX: 0000000000000000 RBX: ffff9717a5c274b0 RCX:
> > 000000008020001c Sep 18 21:27:01 hcd56 kernel: [88437.672599] RDX:
> > 0000000001e2c021 RSI: ffff9710e77ea900 RDI: ffff97120026fa90 Sep 18
> > 21:27:01 hcd56 kernel: [88437.679722] RBP: ffffb1da4a17fce0 R08:
> > 0000000000000000 R09: ffffffffa67e2700 Sep 18 21:27:01 hcd56 kernel:
> > [88437.686848] R10: ffff971017b71400 R11: 0000000000000001 R12:
> > ffff9710e77ea900 Sep 18 21:27:01 hcd56 kernel: [88437.693973] R13:
> > ffff9701e12d7b88 R14: ffff97120026fa92 R15: ffff9710e77ea900 Sep 18
> > 21:27:01 hcd56 kernel: [88437.701095] FS: 0000000000000000(0000)
> > GS:ffff9717ff8c0000(0000) knlGS:0000000000000000 Sep 18 21:27:01 hcd56
> kernel: [88437.709174] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Sep
> 18 21:27:01 hcd56 kernel: [88437.714909] CR2: 0000000000000008 CR3:
> 000000103564c005 CR4: 00000000003606e0 Sep 18 21:27:01 hcd56 kernel:
> [88437.722035] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000 Sep 18 21:27:01 hcd56 kernel: [88437.729160] DR3:
> 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Sep 18
> 21:27:01 hcd56 kernel: [88437.736284] Call Trace:
> > Sep 18 21:27:01 hcd56 kernel: [88437.738733]
> > __jbd2_journal_insert_checkpoint+0x28/0x80
> > Sep 18 21:27:01 hcd56 kernel: [88437.743954]
> > jbd2_journal_commit_transaction+0x124f/0x178d
> > Sep 18 21:27:01 hcd56 kernel: [88437.749434] ?
> > try_to_del_timer_sync+0x54/0x80 Sep 18 21:27:01 hcd56 kernel:
> > [88437.753881] kjournald2+0xb6/0x280 Sep 18 21:27:01 hcd56 kernel:
> > [88437.757286] ? wait_woken+0x80/0x80 Sep 18 21:27:01 hcd56 kernel:
> > [88437.760778] kthread+0x104/0x140 Sep 18 21:27:01 hcd56 kernel:
> > [88437.763231] EXT4-fs error (device nvme0n2):
> > ext4_journal_check_start:61: Detected aborted journal Sep 18 21:27:01
> > hcd56 kernel: [88437.763293] EXT4-fs error (device nvme0n2):
> > ext4_journal_check_start:61: Detected aborted journal Sep 18 21:27:01
> > hcd56 kernel: [88437.764002] ? commit_timeout+0x20/0x20 Sep 18
> > 21:27:01 hcd56 kernel: [88437.764004] ? kthread_park+0x90/0x90 Sep 18
> > 21:27:01 hcd56 kernel: [88437.764009] ret_from_fork+0x35/0x40 Sep 18
> > 21:27:01 hcd56 kernel: [88437.764011] Modules linked in:
> > rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache ipmi_ssif
> > intel_rapl_msr intel_rapl_common sb_edac x86_pkg_temp_thermal
> > intel_powerclamp coretemp kvm_intel kvm irqbypass dax_pmem_compat
> > device_dax nd_pmem dax_pmem_core nd_btt crct10dif_pclmul
> crc32_pclmul
> > ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper
> > intel_cstate input_leds intel_rapl_perf joydev mei_me mei lpc_ich
> > ioatdma ipmi_si ipmi_devintf ipmi_msghandler nfit acpi_power_meter
> > acpi_pad mac_hid iscsi_tcp libiscsi_tcp rdma_ucm mlx4_ib sunrpc
> > ib_uverbs ib_umad ib_iser rdma_cm iw_cm libiscsi scsi_transport_iscsi
> > ib_ipoib ib_cm ib_core parport_pc ppdev lp parport autofs4 btrfs xor
> > zstd_compress raid6_pq libcrc32c mlx4_en hid_generic usbhid hid ast
> > drm_vram_helper i2c_algo_bit ttm drm_kms_helper syscopyarea
> > sysfillrect sysimgblt fb_sys_fops sfc mlx4_core mtd ixgbe drm ahci
> > nvme xfrm_algo libahci nvme_core dca mdio wmi Sep 18 21:27:01 hcd56
> > kernel: [88437.874368] CR2: 0000000000000008 Sep 18 21:27:01 hcd56
> > kernel: [88437.877683] ---[ end trace 5a47dfdfd127baf6 ]---
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel panics when hot removing U.2 nvme disk
2020-09-19 1:44 ` kernel panics when hot removing U.2 nvme disk Keith Busch
2020-09-23 20:40 ` Meng Wang
@ 2020-09-24 5:12 ` Christoph Hellwig
2020-09-24 5:47 ` Meng Wang
1 sibling, 1 reply; 5+ messages in thread
From: Christoph Hellwig @ 2020-09-24 5:12 UTC (permalink / raw)
To: Keith Busch; +Cc: Meng Wang, linux-ext4, linux-nvme@lists.infradead.org
On Fri, Sep 18, 2020 at 06:44:01PM -0700, Keith Busch wrote:
> On Fri, Sep 18, 2020 at 11:47:27PM +0000, Meng Wang wrote:
> > Hi,
> > We found kernel panics today when doing test on hot remove U.2 nvme
> > disk. After hot remove the nvme disk (formatted as ext4), the system
> > freezes and all services stuck. Lot of kernel message flushed the
> > syslog, including the CPU soft lockup, ext4 NULL point er dereferece
> > and ib nic transmission timeout. The kernel panics and configuration
> > are shown below. The used kernel is 5.4.0-050400-generic and OS is
> > Ubuntu 16.04. Not sure whether it's a known bug or configuration
> > error. Any advise are welcome.
>
> [cc'ing ext4 mailing list]
>
> The NULL dereference occured before the soft lockup, so I'm guessing the
> Oops'ed process is holding the same lock the removal task wants.
>
> Your kernel is a bit older, so it may be worth verifying if your
> observation still occurs on the current stable or current mainline, but
> the ext4 developers may have a better idea as this doesn't at least
> initially appear specific to nvme.
The problem is the crazy __invalidate_device stuff that calls into
file system eviction from all kinds of super critical block paths.
While I haven't debugged the root cause this kind of thing just causes
problems without really helping anyone. I have a half-finished series
that kills this crap and instead allows the file system (or other
block device user) to pass shutdown and resize callbacks when the
exclusively open a block device. That way the file system driver
can just mark the file system shutdown to prevent any further damage
without all this mess.
^ permalink raw reply [flat|nested] 5+ messages in thread