watchdog: BUG: soft lockup - CPU#0 stuck for 24s! [syz.4.128:5360] Modules linked in: irq event stamp: 236 hardirqs last enabled at (235): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (235): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (236): [] __el1_irq arch/arm64/kernel/entry-common.c:510 [inline] hardirqs last disabled at (236): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:526 softirqs last enabled at (226): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (226): [] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650 softirqs last disabled at (221): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 0 UID: 0 PID: 5360 Comm: syz.4.128 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_acquire+0x16c/0x368 arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_acquire+0x14c/0x368 kernel/locking/lockdep.c:5870 sp : ffff80009b1477a0 x29: ffff80009b1477f0 x28: 0000000000000000 x27: 0000000000000000 x26: ffff800088920230 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: ffff800088c65840 x21: ffff800080acabcc x20: 0000000000000000 x19: 0000000000000000 x18: 00000000a7feb9ad x17: 00000000c423ef2e x16: 000000007a63865f x15: 0000000000000000 x14: 00005017e7987c00 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a3fcd08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800080acabcc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000008 x1 : ffff0000d56c5700 x0 : 0000000000000000 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) lock_acquire+0x16c/0x368 kernel/locking/lockdep.c:5871 (P) __fs_reclaim_acquire mm/page_alloc.c:4325 [inline] fs_reclaim_acquire+0x90/0x110 mm/page_alloc.c:4339 might_alloc include/linux/sched/mm.h:317 [inline] slab_pre_alloc_hook mm/slub.c:4520 [inline] slab_alloc_node mm/slub.c:4875 [inline] __kmalloc_cache_node_noprof+0x5c/0x6ac mm/slub.c:5427 kmalloc_node_noprof include/linux/slab.h:1077 [inline] alloc_cpumask_var_node+0x90/0x138 lib/cpumask.c:30 alloc_cpumask_var include/linux/cpumask.h:1052 [inline] zalloc_cpumask_var include/linux/cpumask.h:1058 [inline] clock_was_set+0xa4/0x6b0 kernel/time/hrtimer.c:982 do_adjtimex+0x208/0x2f0 kernel/time/timekeeping.c:2924 posix_clock_realtime_adj+0x20/0x30 kernel/time/posix-timers.c:207 do_clock_adjtime+0x120/0x140 kernel/time/posix-timers.c:1154 __do_sys_clock_adjtime kernel/time/posix-timers.c:1166 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1157 [inline] __arm64_sys_clock_adjtime+0x17c/0x2ac kernel/time/posix-timers.c:1157 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4806 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events jump_label_update_timeout 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+0xfa4/0x1614 kernel/smp.c:892 lr : csd_lock_wait kernel/smp.c:342 [inline] lr : smp_call_function_many_cond+0xfbc/0x1614 kernel/smp.c:892 sp : ffff800094da7880 x29: ffff800094da7980 x28: dfff800000000000 x27: ffff0001ae07c5c0 x26: 0000000000000011 x25: 0000000000000000 x24: ffff80008897f680 x23: ffffffffffffffff x22: 1fffe00035c0f8b8 x21: 1fffe00035c0f8b9 x20: ffff0001ae05d9a8 x19: ffff0001ae07c5c8 x18: 1fffe00035c0cc20 x17: ffff80008897b000 x16: ffff800088a2dba0 x15: ffff0001ae06610c x14: ffff0001ae066108 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a3760 x2 : 0000000000000000 x1 : ffff0000d9128000 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+0xfa4/0x1614 kernel/smp.c:892 (P) smp_call_function_many kernel/smp.c:915 [inline] smp_call_function+0x58/0xbc kernel/smp.c:935 kick_all_cpus_sync+0x28/0x34 kernel/smp.c:1081 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34 __jump_label_update+0x314/0x33c kernel/jump_label.c:521 jump_label_update+0x41c/0x4a8 kernel/jump_label.c:910 __static_key_slow_dec_cpuslocked+0xc4/0x138 kernel/jump_label.c:315 __static_key_slow_dec kernel/jump_label.c:321 [inline] jump_label_update_timeout+0x28/0x3c kernel/jump_label.c:329 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842