* [syzbot] [kernel?] INFO: rcu detected stall in kill
@ 2026-04-03 17:50 syzbot
0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2026-04-03 17:50 UTC (permalink / raw)
To: anna-maria, frederic, linux-kernel, syzkaller-bugs, tglx
Hello,
syzbot found the following issue on:
HEAD commit: 9147566d8016 Merge tag 'sched_ext-for-7.0-rc6-fixes' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=151c1516580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91
dashboard link: https://syzkaller.appspot.com/bug?extid=9b95da55ba5146a60734
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111973d6580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12070dda580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c0b15aadfaef/disk-9147566d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9df2af7be859/vmlinux-9147566d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/87eba4cf352e/bzImage-9147566d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9b95da55ba5146a60734@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5969/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=14521, q=2117 ncpus=2)
task:syz-executor state:R running task stack:22432 pid:5969 tgid:5969 ppid:5967 task_flags:0x400140 flags:0x00080000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2d7/0x3d0 kernel/locking/lockdep.c:5893
Code: 16 7b 11 00 00 00 00 eb b5 e8 45 73 0d 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 c5 d0 7a 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 95 81 6e ff cc 48 8d 3d 72 64 73
RSP: 0018:ffffc90003aafd78 EFLAGS: 00000286
RAX: d3d4042ff14ac900 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e16b29d RDI: ffffffff8c27d100
RBP: ffff8880290229d8 R08: ffffffff9011ccb7 R09: 1ffffffff2023996
R10: dffffc0000000000 R11: fffffbfff2023997 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e75e5e0 R15: ffff888029021e80
rcu_lock_release include/linux/rcupdate.h:322 [inline]
rcu_read_unlock include/linux/rcupdate.h:881 [inline]
kill_proc_info+0x168/0x180 kernel/signal.c:1481
kill_something_info kernel/signal.c:1577 [inline]
__do_sys_kill kernel/signal.c:3953 [inline]
__se_sys_kill+0xd9/0x460 kernel/signal.c:3947
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb210b3dda7
RSP: 002b:00007ffe1e460eb8 EFLAGS: 00000217 ORIG_RAX: 000000000000003e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fb210b3dda7
RDX: 0000000000000097 RSI: 0000000000000009 RDI: 0000000000000003
RBP: 00007ffe1e460efc R08: 7fffffffffffffff R09: 0000000000000000
R10: 4000000000000000 R11: 0000000000000217 R12: 0000000000000000
R13: 0000000000000064 R14: 000000000003f067 R15: 00007ffe1e460f50
</TASK>
rcu: rcu_preempt kthread starved for 3053 jiffies! g14521 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27744 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3405 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 04 8b 55 0c 48 89 de 5b e9 e3 99 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 28 db 56 11 65 8b 15 49 db 56 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc900000078f0 EFLAGS: 00000046
RAX: ffffffff878d4630 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff888033120000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888156eed200 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f0c R12: ffff88802b35bc00
R13: dffffc0000000000 R14: ffff888029c47000 R15: ffff888029c47408
FS: 0000000000000000(0000) GS:ffff888125457000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557a11963a38 CR3: 00000000677c5000 CR4: 0000000000350ef0
Call Trace:
<IRQ>
dummy_validate_stream drivers/usb/gadget/udc/dummy_hcd.c:1244 [inline]
dummy_urb_enqueue+0x270/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1282
usb_hcd_submit_urb+0x328/0x1b70 drivers/usb/core/hcd.c:1542
ath9k_hif_usb_reg_in_cb+0x4d5/0x6f0 drivers/net/wireless/ath/ath9k/hif_usb.c:790
__usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657
dummy_timer+0xbbd/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
do_softirq+0x76/0xd0 kernel/softirq.c:523
</IRQ>
<TASK>
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
spin_unlock_bh include/linux/spinlock.h:395 [inline]
batadv_tt_local_purge+0x2a7/0x340 net/batman-adv/translation-table.c:1315
batadv_tt_purge+0x35/0x9e0 net/batman-adv/translation-table.c:3509
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
rescuer_thread+0x827/0x1130 kernel/workqueue.c:3583
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [kernel?] INFO: rcu detected stall in kill
[not found] <20260405012053.369470-1-kartikey406@gmail.com>
@ 2026-04-05 1:39 ` syzbot
0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2026-04-05 1:39 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Write in usb_anchor_urb
usb 1-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline]
BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:283 [inline]
BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:366 [inline]
BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:383 [inline]
BUG: KASAN: slab-use-after-free in kref_get include/linux/kref.h:45 [inline]
BUG: KASAN: slab-use-after-free in usb_get_urb drivers/usb/core/urb.c:113 [inline]
BUG: KASAN: slab-use-after-free in usb_anchor_urb+0x45/0x220 drivers/usb/core/urb.c:131
Write of size 4 at addr ffff88802a8dce00 by task kworker/1:8/6502
CPU: 1 UID: 0 PID: 6502 Comm: kworker/1:8 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events ath9k_hif_usb_reg_in_resubmit
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline]
__refcount_add include/linux/refcount.h:283 [inline]
__refcount_inc include/linux/refcount.h:366 [inline]
refcount_inc include/linux/refcount.h:383 [inline]
kref_get include/linux/kref.h:45 [inline]
usb_get_urb drivers/usb/core/urb.c:113 [inline]
usb_anchor_urb+0x45/0x220 drivers/usb/core/urb.c:131
ath9k_hif_usb_reg_in_resubmit+0x86/0x120 drivers/net/wireless/ath/ath9k/hif_usb.c:746
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 6466:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5260 [inline]
__kmalloc_noprof+0x35c/0x760 mm/slub.c:5272
kmalloc_noprof include/linux/slab.h:954 [inline]
usb_alloc_urb+0x46/0x150 drivers/usb/core/urb.c:75
ath9k_hif_usb_alloc_reg_in_urbs drivers/net/wireless/ath/ath9k/hif_usb.c:1004 [inline]
ath9k_hif_usb_alloc_urbs+0xb8c/0x1120 drivers/net/wireless/ath/ath9k/hif_usb.c:1070
ath9k_hif_usb_dev_init drivers/net/wireless/ath/ath9k/hif_usb.c:1156 [inline]
ath9k_hif_usb_firmware_cb+0x127/0x4c0 drivers/net/wireless/ath/ath9k/hif_usb.c:1289
request_firmware_work_func+0x105/0x1c0 drivers/base/firmware_loader/main.c:1152
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 6345:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2685 [inline]
slab_free mm/slub.c:6165 [inline]
kfree+0x1c1/0x630 mm/slub.c:6483
dummy_timer+0xbbd/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
The buggy address belongs to the object at ffff88802a8dce00
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes inside of
freed 192-byte region [ffff88802a8dce00, ffff88802a8dcec0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a8dc
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88813fea63c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 9831863731, free_ts 9679699786
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3292 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3481
new_slab mm/slub.c:3539 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7175
refill_sheaf mm/slub.c:2812 [inline]
__pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615
alloc_from_pcs mm/slub.c:4717 [inline]
slab_alloc_node mm/slub.c:4851 [inline]
__do_kmalloc_node mm/slub.c:5259 [inline]
__kmalloc_noprof+0x474/0x760 mm/slub.c:5272
kmalloc_noprof include/linux/slab.h:954 [inline]
usb_alloc_urb+0x46/0x150 drivers/usb/core/urb.c:75
usb_internal_control_msg drivers/usb/core/message.c:110 [inline]
usb_control_msg+0x118/0x3e0 drivers/usb/core/message.c:167
usb_get_descriptor+0xb1/0x3e0 drivers/usb/core/message.c:852
usb_get_configuration+0x2c3/0x54f0 drivers/usb/core/config.c:956
usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
usb_new_device+0x145/0x16f0 drivers/usb/core/hub.c:2665
register_root_hub+0x270/0x5f0 drivers/usb/core/hcd.c:990
usb_add_hcd+0xba1/0x10b0 drivers/usb/core/hcd.c:2987
vhci_hcd_probe+0x141/0x3e0 drivers/usb/usbip/vhci_hcd.c:1388
platform_probe+0xf9/0x190 drivers/base/platform.c:1418
page last free pid 29 tgid 29 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
vfree+0x25a/0x400 mm/vmalloc.c:3479
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3398
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff88802a8dcd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88802a8dcd80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88802a8dce00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802a8dce80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88802a8dcf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Tested on:
commit: 3aae9383 Merge tag 'input-for-v7.0-rc6' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=135c4e06580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91
dashboard link: https://syzkaller.appspot.com/bug?extid=9b95da55ba5146a60734
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=131ff3d6580000
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [kernel?] INFO: rcu detected stall in kill
[not found] <20260405021945.371546-1-kartikey406@gmail.com>
@ 2026-04-05 2:37 ` syzbot
0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2026-04-05 2:37 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Write in ath9k_hif_usb_reg_in_resubmit
==================================================================
BUG: KASAN: slab-use-after-free in ath9k_hif_usb_reg_in_resubmit+0x143/0x170 drivers/net/wireless/ath/ath9k/hif_usb.c:759
Write of size 8 at addr ffff8880282609b0 by task kworker/0:4/5926
CPU: 0 UID: 0 PID: 5926 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events ath9k_hif_usb_reg_in_resubmit
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
ath9k_hif_usb_reg_in_resubmit+0x143/0x170 drivers/net/wireless/ath/ath9k/hif_usb.c:759
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 6436:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5260 [inline]
__kmalloc_noprof+0x35c/0x760 mm/slub.c:5272
kmalloc_noprof include/linux/slab.h:954 [inline]
usb_alloc_urb+0x46/0x150 drivers/usb/core/urb.c:75
ath9k_hif_usb_alloc_reg_in_urbs drivers/net/wireless/ath/ath9k/hif_usb.c:1019 [inline]
ath9k_hif_usb_alloc_urbs+0xb8c/0x1120 drivers/net/wireless/ath/ath9k/hif_usb.c:1085
ath9k_hif_usb_dev_init drivers/net/wireless/ath/ath9k/hif_usb.c:1171 [inline]
ath9k_hif_usb_firmware_cb+0x127/0x4c0 drivers/net/wireless/ath/ath9k/hif_usb.c:1304
request_firmware_work_func+0x105/0x1c0 drivers/base/firmware_loader/main.c:1152
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 5926:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2685 [inline]
slab_free mm/slub.c:6165 [inline]
kfree+0x1c1/0x630 mm/slub.c:6483
urb_destroy drivers/usb/core/urb.c:27 [inline]
kref_put include/linux/kref.h:65 [inline]
usb_free_urb drivers/usb/core/urb.c:96 [inline]
__usb_unanchor_urb drivers/usb/core/urb.c:153 [inline]
usb_unanchor_urb+0x283/0x380 drivers/usb/core/urb.c:183
ath9k_hif_usb_reg_in_resubmit+0xf4/0x170 drivers/net/wireless/ath/ath9k/hif_usb.c:755
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff888028260900
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 176 bytes inside of
freed 192-byte region [ffff888028260900, ffff8880282609c0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28260
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88813fea63c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 24, tgid 24 (kworker/1:0), ts 10584606067, free_ts 6626023302
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3292 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3481
new_slab mm/slub.c:3539 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7175
refill_sheaf mm/slub.c:2812 [inline]
__pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615
alloc_from_pcs mm/slub.c:4717 [inline]
slab_alloc_node mm/slub.c:4851 [inline]
__do_kmalloc_node mm/slub.c:5259 [inline]
__kmalloc_noprof+0x474/0x760 mm/slub.c:5272
kmalloc_noprof include/linux/slab.h:954 [inline]
usb_alloc_urb+0x46/0x150 drivers/usb/core/urb.c:75
usb_internal_control_msg drivers/usb/core/message.c:110 [inline]
usb_control_msg+0x118/0x3e0 drivers/usb/core/message.c:167
get_port_status drivers/usb/core/hub.c:607 [inline]
hub_ext_port_status+0x116/0x820 drivers/usb/core/hub.c:624
usb_hub_port_status drivers/usb/core/hub.c:674 [inline]
hub_activate+0x6eb/0x1a80 drivers/usb/core/hub.c:1185
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page last free pid 24 tgid 24 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
vfree+0x25a/0x400 mm/vmalloc.c:3479
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3398
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff888028260880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888028260900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888028260980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff888028260a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888028260a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
Tested on:
commit: 3aae9383 Merge tag 'input-for-v7.0-rc6' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11424e06580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91
dashboard link: https://syzkaller.appspot.com/bug?extid=9b95da55ba5146a60734
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=108bc1ca580000
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [kernel?] INFO: rcu detected stall in kill
[not found] <20260405044137.374636-1-kartikey406@gmail.com>
@ 2026-04-05 5:00 ` syzbot
0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2026-04-05 5:00 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in usb_anchor_urb
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff888077fdd310 by task kworker/0:0/9
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events ath9k_hif_usb_reg_in_resubmit
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x79/0x2e0 kernel/locking/lockdep.c:5842
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
usb_anchor_urb+0x2a/0x220 drivers/usb/core/urb.c:130
ath9k_hif_usb_reg_in_resubmit+0xa7/0x1a0 drivers/net/wireless/ath/ath9k/hif_usb.c:750
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 9:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5380
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
ath9k_hif_usb_probe+0x364/0xae0 drivers/net/wireless/ath/ath9k/hif_usb.c:1416
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:721
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:863
driver_probe_device+0x4f/0x240 drivers/base/dd.c:893
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1021
bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c5/0x450 drivers/base/dd.c:1093
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1148
bus_probe_device+0x12a/0x220 drivers/base/bus.c:613
device_add+0x7b6/0xb70 drivers/base/core.c:3691
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2266
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:721
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:863
driver_probe_device+0x4f/0x240 drivers/base/dd.c:893
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1021
bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c5/0x450 drivers/base/dd.c:1093
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1148
bus_probe_device+0x12a/0x220 drivers/base/bus.c:613
device_add+0x7b6/0xb70 drivers/base/core.c:3691
usb_new_device+0xa08/0x16f0 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x2a1c/0x4f30 drivers/usb/core/hub.c:5953
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 6558:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2685 [inline]
slab_free mm/slub.c:6165 [inline]
kfree+0x1c1/0x630 mm/slub.c:6483
ath9k_hif_usb_disconnect+0x1cf/0x250 drivers/net/wireless/ath/ath9k/hif_usb.c:1489
usb_unbind_interface+0x26e/0x910 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:633 [inline]
__device_release_driver drivers/base/dd.c:1344 [inline]
device_release_driver_internal+0x4d9/0x870 drivers/base/dd.c:1367
bus_remove_device+0x455/0x570 drivers/base/bus.c:657
device_del+0x527/0x8f0 drivers/base/core.c:3880
usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1476
usb_disconnect+0x32f/0x990 drivers/usb/core/hub.c:2345
hub_port_connect drivers/usb/core/hub.c:5407 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x1cc9/0x4f30 drivers/usb/core/hub.c:5953
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff888077fdd000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 784 bytes inside of
freed 2048-byte region [ffff888077fdd000, ffff888077fdd800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77fd8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fea7000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fea7000 dead000000000100 dead000000000122
head: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0001dff601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5176, tgid 5176 (klogd), ts 142953379597, free_ts 142877816667
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3292 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3481
new_slab mm/slub.c:3539 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7175
refill_sheaf mm/slub.c:2812 [inline]
__pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615
alloc_from_pcs mm/slub.c:4717 [inline]
slab_alloc_node mm/slub.c:4851 [inline]
__kmalloc_cache_noprof+0x392/0x660 mm/slub.c:5375
kmalloc_noprof include/linux/slab.h:950 [inline]
syslog_print+0x103/0x610 kernel/printk/printk.c:1585
do_syslog+0x583/0x7d0 kernel/printk/printk.c:1763
__do_sys_syslog kernel/printk/printk.c:1855 [inline]
__se_sys_syslog kernel/printk/printk.c:1853 [inline]
__x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1853
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 50 tgid 50 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
__slab_free+0x263/0x2b0 mm/slub.c:5573
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4538 [inline]
slab_alloc_node mm/slub.c:4866 [inline]
kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4918
__alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702
alloc_skb include/linux/skbuff.h:1383 [inline]
mld_newpack+0x14c/0xc90 net/ipv6/mcast.c:1775
add_grhead+0x5a/0x2a0 net/ipv6/mcast.c:1886
add_grec+0x1452/0x1740 net/ipv6/mcast.c:2025
mld_send_initial_cr+0x288/0x550 net/ipv6/mcast.c:2268
ipv6_mc_dad_complete+0x88/0x540 net/ipv6/mcast.c:2279
addrconf_dad_completed+0x8a7/0xe60 net/ipv6/addrconf.c:4344
addrconf_dad_work+0xc5e/0x14c0 net/ipv6/addrconf.c:-1
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
Memory state around the buggy address:
ffff888077fdd200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888077fdd280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888077fdd300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888077fdd380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888077fdd400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: 3aae9383 Merge tag 'input-for-v7.0-rc6' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1740d9f6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91
dashboard link: https://syzkaller.appspot.com/bug?extid=9b95da55ba5146a60734
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=15ca5d02580000
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [kernel?] INFO: rcu detected stall in kill
[not found] <20260405051753.375869-1-kartikey406@gmail.com>
@ 2026-04-05 5:36 ` syzbot
0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2026-04-05 5:36 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: locking bug in ath9k_hif_usb_dealloc_urbs
ath9k_htc: Failed to initialize the device
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#1: kworker/1:4/5897
WARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4854 [inline], CPU#1: kworker/1:4/5897
WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x39d/0x2cf0 kernel/locking/lockdep.c:5187, CPU#1: kworker/1:4/5897
Modules linked in:
CPU: 1 UID: 0 PID: 5897 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events request_firmware_work_func
RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline]
RIP: 0010:__lock_acquire+0x3a4/0x2cf0 kernel/locking/lockdep.c:5187
Code: 18 00 4c 8b 74 24 08 75 27 90 e8 c7 8a 0a 03 85 c0 74 1c 83 3d a0 76 70 0e 00 75 13 48 8d 3d a3 97 73 0e 48 c7 c6 0f 96 01 8e <67> 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 41 8b 45 20 25 ff 1f
RSP: 0018:ffffc90003c77588 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000040000 RCX: ffff88807ca75b80
RDX: 0000000000000000 RSI: ffffffff8e01960f RDI: ffffffff90152ad0
RBP: 0000000000000002 R08: ffffffff901209c3 R09: 1ffffffff2024138
R10: dffffc0000000000 R11: fffffbfff2024139 R12: 0000000000000936
R13: ffff88807ca76728 R14: ffff88807ca75b80 R15: ffff88807ca766d8
FS: 0000000000000000(0000) GS:ffff888125554000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559755574be0 CR3: 000000005396b000 CR4: 0000000000350ef0
Call Trace:
<TASK>
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:3991
__flush_workqueue+0x14b/0x14f0 kernel/workqueue.c:4033
drain_workqueue+0xd3/0x390 kernel/workqueue.c:4197
destroy_workqueue+0xbb/0xc60 kernel/workqueue.c:5967
ath9k_hif_usb_dealloc_reg_in_urbs drivers/net/wireless/ath/ath9k/hif_usb.c:1000 [inline]
ath9k_hif_usb_dealloc_urbs+0x6a/0x1c0 drivers/net/wireless/ath/ath9k/hif_usb.c:1105
ath9k_hif_usb_dev_deinit drivers/net/wireless/ath/ath9k/hif_usb.c:1188 [inline]
ath9k_hif_usb_firmware_cb+0x260/0x4c0 drivers/net/wireless/ath/ath9k/hif_usb.c:1330
request_firmware_work_func+0x105/0x1c0 drivers/base/firmware_loader/main.c:1152
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: 18 00 sbb %al,(%rax)
2: 4c 8b 74 24 08 mov 0x8(%rsp),%r14
7: 75 27 jne 0x30
9: 90 nop
a: e8 c7 8a 0a 03 call 0x30a8ad6
f: 85 c0 test %eax,%eax
11: 74 1c je 0x2f
13: 83 3d a0 76 70 0e 00 cmpl $0x0,0xe7076a0(%rip) # 0xe7076ba
1a: 75 13 jne 0x2f
1c: 48 8d 3d a3 97 73 0e lea 0xe7397a3(%rip),%rdi # 0xe7397c6
23: 48 c7 c6 0f 96 01 8e mov $0xffffffff8e01960f,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 90 nop
30: 31 c0 xor %eax,%eax
32: 0f b6 98 c4 00 00 00 movzbl 0xc4(%rax),%ebx
39: 41 8b 45 20 mov 0x20(%r13),%eax
3d: 25 .byte 0x25
3e: ff 1f lcall *(%rdi)
Tested on:
commit: 3aae9383 Merge tag 'input-for-v7.0-rc6' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=114706ba580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91
dashboard link: https://syzkaller.appspot.com/bug?extid=9b95da55ba5146a60734
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=15e8cdda580000
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