watchdog: BUG: soft lockup - CPU#0 stuck for 74s! [syz.5.1049:9271] Modules linked in: irq event stamp: 31062 hardirqs last enabled at (31061): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (31061): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 hardirqs last disabled at (31062): [] __el1_irq arch/arm64/kernel/entry-common.c:565 [inline] hardirqs last disabled at (31062): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:581 softirqs last enabled at (31054): [] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (31054): [] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673 softirqs last disabled at (31049): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 CPU: 0 UID: 0 PID: 9271 Comm: syz.5.1049 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 sp : ffff800092917940 x29: ffff800092917940 x28: 0000001af6506c35 x27: fffffdc2b98a3835 x26: 0000000000000001 x25: ffff0000d683c360 x24: ffff0001adea9f80 x23: ffff0001adea9e40 x22: 000002583cc63400 x21: dfff800000000000 x20: ffff0001adea9e40 x19: 0000000000000000 x18: 000000003d112124 x17: ffff80008055f8fc x16: ffff8000805491d0 x15: ffff80008a728000 x14: 0000000000000003 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a527e28 x10: 0000000000000003 x9 : 0000000000000001 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000020 x4 : 0000000000000008 x3 : ffff8000801557b0 x2 : 0000000000000007 x1 : ffff0000c5098000 x0 : ffff800125484000 Call trace: __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) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 (P) class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:596 [inline] clock_was_set+0x514/0x704 kernel/time/hrtimer.c:1000 do_adjtimex+0x208/0x2f0 kernel/time/timekeeping.c:3057 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+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 9081 Comm: udevd Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:363 [inline] pc : smp_call_function_many_cond+0x1104/0x14e0 kernel/smp.c:1002 lr : csd_lock_wait kernel/smp.c:363 [inline] lr : smp_call_function_many_cond+0x111c/0x14e0 kernel/smp.c:1002 sp : ffff8000948f78e0 x29: ffff8000948f7a20 x28: dfff800000000000 x27: 0000000000000001 x26: 0000000000000000 x25: 0000000000000011 x24: 0000000000000000 x23: ffffffffffffffff x22: 1fffe00035bdc680 x21: ffff0001adec3688 x20: ffff0000ce9ad038 x19: ffff0001adee3400 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 000000000073c67e x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600035bd86d2 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff80008059ee30 x2 : 0000000000000000 x1 : ffff0000ce9abb00 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:363 [inline] (P) smp_call_function_many_cond+0x1104/0x14e0 kernel/smp.c:1002 (P) on_each_cpu_cond_mask+0x50/0x68 kernel/smp.c:1169 on_each_cpu_cond include/linux/smp.h:105 [inline] invalidate_bh_lrus+0x34/0x40 fs/buffer.c:1445 kill_bdev+0x68/0x90 block/bdev.c:89 blkdev_flush_mapping+0xb8/0x24c block/bdev.c:757 blkdev_put_whole+0x64/0x110 block/bdev.c:764 bdev_release+0x244/0x328 block/bdev.c:-1 blkdev_release+0x20/0x34 block/fops.c:682 __fput+0x338/0x74c fs/file_table.c:512 fput_close_sync+0x10c/0x278 fs/file_table.c:617 __do_sys_close fs/open.c:1560 [inline] __se_sys_close fs/open.c:1545 [inline] __arm64_sys_close+0x80/0x110 fs/open.c:1545 __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+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog