watchdog: BUG: soft lockup - CPU#1 stuck for 21s! [syz-executor:4712] Modules linked in: irq event stamp: 463306 hardirqs last enabled at (463305): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (463305): [] __arm64_exit_to_kernel_mode+0x64/0x78 arch/arm64/kernel/entry-common.c:60 hardirqs last disabled at (463306): [] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (463306): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (463304): [] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (463304): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:673 softirqs last disabled at (463155): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 CPU: 1 UID: 0 PID: 4712 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 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 : csd_lock kernel/smp.c:396 [inline] pc : smp_call_function_many_cond+0x73c/0x1590 kernel/smp.c:944 lr : csd_lock_wait kernel/smp.c:363 [inline] lr : csd_lock kernel/smp.c:396 [inline] lr : smp_call_function_many_cond+0x754/0x1590 kernel/smp.c:944 sp : ffff800097c27900 x29: ffff800097c27a40 x28: ffff800088bfa960 x27: 0000000000000011 x26: dfff800000000000 x25: 1ffff0001117f52c x24: 0000000000000000 x23: ffff800088bfa960 x22: ffff0001add13648 x21: ffff0001add13640 x20: ffff0000d3c75038 x19: 0000000000000000 x18: 1fffe00035ba3828 x17: 0000000000000003 x16: ffff800088bf7000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600035ba26ca x9 : 0000000000000000 x8 : 0000000000000011 x7 : ffff80008094e390 x6 : 0000000000000000 x5 : 0000000000000000 x4 : ffff800080ddc9e4 x3 : ffff8000805ba728 x2 : 0000000000000000 x1 : ffff0000d3c73b00 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) csd_lock kernel/smp.c:396 [inline] (P) smp_call_function_many_cond+0x73c/0x1590 kernel/smp.c:944 (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 invalidate_bdev+0x74/0xa4 block/bdev.c:99 ext4_put_super+0x618/0x904 fs/ext4/super.c:1357 generic_shutdown_super+0x13c/0x2c0 fs/super.c:769 kill_block_super+0x48/0xa4 fs/super.c:1918 ext4_kill_sb+0x68/0xa8 fs/ext4/super.c:7527 deactivate_locked_super+0xcc/0x130 fs/super.c:603 deactivate_super+0xd8/0xf8 fs/super.c:632 cleanup_mnt+0x318/0x3a8 fs/namespace.c:1317 __cleanup_mnt+0x20/0x30 fs/namespace.c:1324 task_work_run+0x1cc/0x25c kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x10c/0x17c kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:108 [inline] el0_svc+0x18c/0x260 arch/arm64/kernel/entry-common.c:759 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: 5587 Comm: syz.5.135 Not tainted syzkaller #0 PREEMPT 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 : __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:629 lr : handle_softirqs+0x1c8/0xd98 kernel/softirq.c:629 sp : ffff80008ec37ef0 x29: ffff80008ec37f80 x28: ffff0000c5f01d88 x27: ffff0000c5f01d90 x26: 0000000000000001 x25: 0000000000000186 x24: dfff800000000000 x23: ffff0001add0b040 x22: ffff0000c5f01d80 x21: 000000000000000a x20: ffff800088bb7040 x19: ffff0001add0b040 x18: 00000000ffffffff x17: ffff800125154000 x16: ffff80008ec30000 x15: ffff800080552000 x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000003 x11: ffff80008a6a6e28 x10: 0000000000000003 x9 : 0000000000000000 x8 : 000000000000011a x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000801561b4 x2 : 0000000000000003 x1 : ffff0000c5f01d80 x0 : ffff800125154000 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:629 (P) __do_softirq+0x14/0x20 kernel/softirq.c:679 ____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:526 [inline] __irq_exit_rcu+0x1c0/0x458 kernel/softirq.c:767 irq_exit_rcu+0x14/0x84 kernel/softirq.c:784 __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) __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+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