watchdog: BUG: soft lockup - CPU#1 stuck for 21s! [udevd:8214] Modules linked in: irq event stamp: 549362 hardirqs last enabled at (549361): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (549361): [] __arm64_exit_to_kernel_mode+0x64/0x78 arch/arm64/kernel/entry-common.c:60 hardirqs last disabled at (549362): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (549362): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (549360): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (549360): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (549349): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 8214 Comm: udevd Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:342 [inline] pc : smp_call_function_many_cond+0x114c/0x17c0 kernel/smp.c:912 lr : csd_lock_wait kernel/smp.c:342 [inline] lr : smp_call_function_many_cond+0x1164/0x17c0 kernel/smp.c:912 sp : ffff800095cf7900 x29: ffff800095cf7a20 x28: 0000000000000011 x27: 0000000000000000 x26: ffff0001a5df5980 x25: ffff800088b3b6a0 x24: ffffffffffffffff x23: dfff800000000000 x22: 1fffe00034bbeb30 x21: 1fffe00034bbeb31 x20: ffff0001a5df5988 x19: fffffdffbf742fe8 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff7fbff7ee85fe x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000805b6cd0 x2 : 0000000000000000 x1 : ffff0000cbcad7c0 x0 : 0000000000000000 Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) csd_lock_wait kernel/smp.c:342 [inline] (P) smp_call_function_many_cond+0x114c/0x17c0 kernel/smp.c:912 (P) on_each_cpu_cond_mask+0x5c/0xc4 kernel/smp.c:1077 on_each_cpu_cond include/linux/smp.h:106 [inline] invalidate_bh_lrus+0x34/0x40 fs/buffer.c:1538 kill_bdev+0x68/0x90 block/bdev.c:90 blkdev_flush_mapping+0xb8/0x24c block/bdev.c:715 blkdev_put_whole+0x64/0x110 block/bdev.c:722 bdev_release+0x244/0x328 block/bdev.c:-1 blkdev_release+0x20/0x34 block/fops.c:680 __fput+0x338/0x74c fs/file_table.c:512 fput_close_sync+0x10c/0x278 fs/file_table.c:617 __do_sys_close fs/open.c:1511 [inline] __se_sys_close fs/open.c:1496 [inline] __arm64_sys_close+0x80/0x110 fs/open.c:1496 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8790 Comm: syz.5.1031 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:-1 [inline] pc : arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] pc : handle_softirqs+0x1cc/0xd98 kernel/softirq.c:606 lr : handle_softirqs+0x1c8/0xd98 kernel/softirq.c:606 sp : ffff80008eb67ef0 x29: ffff80008eb67f80 x28: ffff0000c35a0008 x27: ffff0000c35a0010 x26: ffff800088ae22f0 x25: 0000000000000186 x24: dfff800000000000 x23: ffff0001a5dce640 x22: ffff0000c35a0000 x21: 000000000000000a x20: ffff800088af6640 x19: ffff0001a5dce640 x18: 000000008f3891ad x17: ffff80011d2d8000 x16: ffff80008eb60000 x15: ffff80008054eac8 x14: ffff800086895f64 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a5d5e28 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000d9c x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080156118 x2 : 0000000000000003 x1 : ffff0000c35a0000 x0 : ffff80011d2d8000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) handle_softirqs+0x1cc/0xd98 kernel/softirq.c:606 (P) __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:531 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:543 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:548 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:586 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_acquire+0x16c/0x364 kernel/locking/lockdep.c:5871 (P) percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read include/linux/percpu-rwsem.h:77 [inline] cpus_read_lock+0x58/0x25c kernel/cpu.c:490 class_cpus_read_lock_constructor include/linux/cpuhplock.h:49 [inline] clock_was_set+0xa8/0x674 kernel/time/hrtimer.c:988 do_adjtimex+0x208/0x2f0 kernel/time/timekeeping.c:3006 posix_clock_realtime_adj+0x20/0x30 kernel/time/posix-timers.c:207 do_clock_adjtime+0x120/0x140 kernel/time/posix-timers.c:1169 __do_sys_clock_adjtime kernel/time/posix-timers.c:1181 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline] __arm64_sys_clock_adjtime+0x184/0x2b0 kernel/time/posix-timers.c:1172 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x19c/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590