watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [udevd:7522]
Modules linked in:
irq event stamp: 135092
hardirqs last  enabled at (135091): [<ffff800011b9f848>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (135091): [<ffff800011b9f848>] exit_to_kernel_mode+0xcc/0xfc arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (135092): [<ffff800011b9d900>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (135092): [<ffff800011b9d900>] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (130524): [<ffff8000081aec5c>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last  enabled at (130524): [<ffff8000081aec5c>] handle_softirqs+0xb1c/0xc90 kernel/softirq.c:624
softirqs last disabled at (130457): [<ffff800008020e6c>] __do_softirq+0x14/0x20 kernel/softirq.c:630
CPU: 0 PID: 7522 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : csd_lock_wait kernel/smp.c:424 [inline]
pc : smp_call_function_many_cond+0xeac/0x1404 kernel/smp.c:998
lr : csd_lock_wait kernel/smp.c:424 [inline]
lr : smp_call_function_many_cond+0xec4/0x1404 kernel/smp.c:998
sp : ffff8000227f7890
x29: ffff8000227f78e0 x28: dfff800000000000 x27: ffff800008aa9f54
x26: ffff8000163dd000 x25: 0000000000000011 x24: ffff8000163e0f50
x23: ffff00019e120480 x22: 1fffe00033c24090 x21: ffff00019e145cc8
x20: 0000000000000001 x19: ffff8000165da920 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082de324 x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe00033c28b99 x12: 0000000000000000
x11: ff00800008411788 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : ffff800008aa9f54 x3 : ffff80000841177c
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:252 [inline]
 __cmpwait arch/arm64/include/asm/cmpxchg.h:278 [inline]
 csd_lock_wait kernel/smp.c:424 [inline]
 smp_call_function_many_cond+0xeac/0x1404 kernel/smp.c:998
 on_each_cpu_cond_mask+0x5c/0xc4 kernel/smp.c:1165
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x34/0x40 fs/buffer.c:1412
 kill_bdev block/bdev.c:75 [inline]
 blkdev_flush_mapping+0x128/0x280 block/bdev.c:677
 blkdev_put_whole block/bdev.c:708 [inline]
 blkdev_put+0x498/0x6b0 block/bdev.c:968
 blkdev_close+0x54/0x94 block/fops.c:514
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1166
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x12c arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589