watchdog: BUG: soft lockup - CPU#1 stuck for 24s! [syz.6.407:6921] Modules linked in: irq event stamp: 3400 hardirqs last enabled at (3399): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (3399): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (3400): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (3400): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (3386): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (3386): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (3386): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797 softirqs last disabled at (3384): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (3384): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (3384): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790 CPU: 1 UID: 0 PID: 6921 Comm: syz.6.407 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 : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 sp : ffff800098477940 x29: ffff800098477940 x28: dfff800000000000 x27: ffff70001308ef30 x26: ffff80008e853330 x25: 7fffffffffffffff x24: 0000000000000005 x23: ffff800098477a80 x22: 7fffffffffffffff x21: 0000000000000000 x20: ffff80008e853358 x19: 0000000000000000 x18: 000000003482dba6 x17: 00000000992296ca x16: 00000000d73861fe x15: 0000000000000000 x14: 00005019dbadb980 x13: 0000000000000001 x12: 0000000000000000 x11: ffff800080156070 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 00004c4b40000000 x5 : ffff80008e853228 x4 : 0000000000000008 x3 : ffff800080156118 x2 : 0000000000000000 x1 : ffff0000c80fd7c0 x0 : ffff80011d2fd000 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:178 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 (P) class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:573 [inline] __do_adjtimex+0x908/0xb8c kernel/time/timekeeping.c:2985 do_adjtimex+0xc0/0x2f0 kernel/time/timekeeping.c:2996 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+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: 6907 Comm: syz.7.403 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 63400005 (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 : ffff8000926b7900 x29: ffff8000926b7a20 x28: 0000000000000011 x27: 0000000000000001 x26: ffff0001a5dd0980 x25: ffff800088b3b6a0 x24: ffffffffffffffff x23: dfff800000000000 x22: 1fffe00034bba130 x21: 1fffe00034bba131 x20: ffff0001a5dd0988 x19: ffff0001a5dfa2e8 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000080000 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000805b6cd0 x2 : 0000000000000000 x1 : ffff0000c7b7ba80 x0 : 0000000000000001 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