watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [udevd:4599]
Modules linked in:
irq event stamp: 6102
hardirqs last  enabled at (6101): [<ffff80000882fc14>] ___slab_alloc+0xc34/0xda8 mm/slub.c:2968
hardirqs last disabled at (6102): [<ffff8000111ca5d8>] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227
softirqs last  enabled at (6074): [<ffff800008031f6c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (6072): [<ffff800008031f38>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
CPU: 1 PID: 4599 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 02400005 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : queued_spin_lock_slowpath+0x620/0x798 kernel/locking/qspinlock.c:511
lr : queued_spin_lock_slowpath+0x62c/0x798 kernel/locking/qspinlock.c:511
sp : ffff80001f8a75e0
x29: ffff80001f8a7680 x28: 1fffe0001aa2a4cf x27: 1fffe0003421d0e8
x26: ffff800014181000 x25: 0000000000000000 x24: dfff800000000000
x23: ffff700003f14ec0 x22: ffff0000d515267a x21: 0000000000000000
x20: ffff0001a10e8740 x19: ffff0000d5152678 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000111cbe1c x15: 000000000000000a
x14: 00000000ffff8000 x13: 1ffff0000283006b x12: 0000000000000001
x11: 1fffe0001aa2a4cf x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000080100 x7 : ffff8000101101f0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000082d5794
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]
 queued_spin_lock_slowpath+0x620/0x798 kernel/locking/qspinlock.c:511
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x2ec/0x2f0 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0xb8/0x10c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 unix_dgram_sendmsg+0x77c/0x1188 net/unix/af_unix.c:1847
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x23c/0x31c net/socket.c:1079
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x7c8/0xa2c fs/read_write.c:594
 ksys_write+0x120/0x210 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584