watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [syz.3.364:6421] Modules linked in: irq event stamp: 7730 hardirqs last enabled at (7729): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (7729): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (7730): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (7730): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (7718): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (7718): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (7713): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 0 UID: 0 PID: 6421 Comm: syz.3.364 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __pi_memset_generic+0x28/0x188 arch/arm64/lib/memset.S:59 lr : slab_post_alloc_hook mm/slub.c:4573 [inline] lr : slab_alloc_node mm/slub.c:4899 [inline] lr : __kmalloc_cache_node_noprof+0x2ec/0x6ac mm/slub.c:5428 sp : ffff8000949278a0 x29: ffff8000949278c0 x28: ffff800088a0c000 x27: ffff0000d7481d00 x26: 0000000000000008 x25: 0000000000000001 x24: ffff0000d067e7c0 x23: ffff8000867b8fc8 x22: 00000000ffffffff x21: ffff0000c0001500 x20: 0000000000000dc0 x19: 0000000000000008 x18: 00000000b5a0177d x17: 0000000036d06501 x16: 0000000021ac24ec x15: 0000000000000000 x14: 00005017e7987c00 x13: 0000000000000001 x12: ffff0000d7481d00 x11: 00000000ccc5a908 x10: 0000000000000001 x9 : 2000800000000001 x8 : ffff0000d067e7c8 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000008 x1 : 0000000000000000 x0 : ffff0000d067e7c0 Call trace: __pi_memset_generic+0x28/0x188 arch/arm64/lib/memset.S:57 (P) 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+0xa0/0x690 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/0x2a8 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+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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 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: 5346 Comm: kworker/u8:9 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Workqueue: events_unbound toggle_allocation_gate 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+0xfd0/0x1640 kernel/smp.c:892 lr : csd_lock_wait kernel/smp.c:342 [inline] lr : smp_call_function_many_cond+0xfe8/0x1640 kernel/smp.c:892 sp : ffff8000965d77e0 x29: ffff8000965d78d0 x28: 0000000000000011 x27: 0000000000000000 x26: ffff0001adf97780 x25: ffff800088a0f680 x24: ffffffffffffffff x23: 1fffe00035bf2ef0 x22: dfff800000000000 x21: 1fffe00035bf2ef1 x20: ffff0001adf97788 x19: ffff0001adf78b68 x18: 1fffe00035bf0220 x17: 0000000000000003 x16: ffff800088a0b000 x15: ffff800088abda60 x14: ffff0001adf8110c x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600035bef16e x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a8f60 x2 : 0000000000000000 x1 : ffff0000d5919d00 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+0xfd0/0x1640 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+0x31c/0x344 kernel/jump_label.c:521 jump_label_update+0x428/0x4b8 kernel/jump_label.c:910 static_key_enable_cpuslocked+0x11c/0x220 kernel/jump_label.c:210 static_key_enable+0x24/0x38 kernel/jump_label.c:223 toggle_allocation_gate+0xb8/0x28c mm/kfence/core.c:906 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3397 worker_thread+0x798/0xbd0 kernel/workqueue.c:3478 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842