watchdog: BUG: soft lockup - CPU#1 stuck for 21s! [syz.7.802:8180] Modules linked in: irq event stamp: 37146 hardirqs last enabled at (37145): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (37145): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (37146): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (37146): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (37132): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (37132): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (37132): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1793 softirqs last disabled at (37130): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (37130): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (37130): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1786 CPU: 1 UID: 0 PID: 8180 Comm: syz.7.802 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : find_stack+0x30/0x150 lib/stackdepot.c:609 lr : stack_depot_save_flags+0x1ac/0x6d8 lib/stackdepot.c:676 sp : ffff800092bc7560 x29: ffff800092bc7560 x28: 0000000000000c00 x27: ffff0000c4771d00 x26: 0000000000000008 x25: ffff0000c4771d00 x24: ffff0001a45d5570 x23: 0000000000000001 x22: 000000002653d557 x21: 0000000000000dc0 x20: ffff800092bc7620 x19: ffff0001a45d5570 x18: 00000000b2517732 x17: 00000000db7a62ae x16: 00000000308d308e x15: 0000000000000000 x14: 000000008682e534 x13: 00000000ccdb7cdf x12: 00000000e0dc7468 x11: 000000006445fccb x10: 00000000c81f8601 x9 : ffff0001a4200000 x8 : 0000000000000001 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000001 x3 : 000000002653d557 x2 : 0000000000000010 x1 : ffff800092bc7620 x0 : ffff0001a45d5570 Call trace: find_stack+0x30/0x150 lib/stackdepot.c:609 (P) stack_depot_save_flags+0x1ac/0x6d8 lib/stackdepot.c:676 kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x54/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_node_noprof+0x32c/0x6ac mm/slub.c:5432 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5427 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT 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 : ffff800096a377e0 x29: ffff800096a378d0 x28: 0000000000000011 x27: 0000000000000001 x26: ffff0001adf72780 x25: ffff800088a0f680 x24: ffffffffffffffff x23: 1fffe00035bee4f0 x22: dfff800000000000 x21: 1fffe00035bee4f1 x20: ffff0001adf72788 x19: ffff0001adf9c0a8 x18: 1fffe00035beb820 x17: 0000000000000003 x16: ffff800088a0b000 x15: ffff800088abda60 x14: 000000008037e198 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600035bf3816 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a8f60 x2 : 0000000000000000 x1 : ffff0000cdd7ba00 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 watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u8:10:5427] Modules linked in: irq event stamp: 472658 hardirqs last enabled at (472657): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (472657): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (472658): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (472658): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (472656): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (472656): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (472599): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 0 UID: 0 PID: 5427 Comm: kworker/u8:10 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 : ffff800096a377e0 x29: ffff800096a378d0 x28: 0000000000000011 x27: 0000000000000001 x26: ffff0001adf72780 x25: ffff800088a0f680 x24: ffffffffffffffff x23: 1fffe00035bee4f0 x22: dfff800000000000 x21: 1fffe00035bee4f1 x20: ffff0001adf72788 x19: ffff0001adf9c0a8 x18: 1fffe00035beb820 x17: 0000000000000003 x16: ffff800088a0b000 x15: ffff800088abda60 x14: 000000008037e198 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600035bf3816 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a8f60 x2 : 0000000000000000 x1 : ffff0000cdd7ba00 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 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8180 Comm: syz.7.802 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 : __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:606 lr : handle_softirqs+0x1c8/0xd98 kernel/softirq.c:606 sp : ffff80008ea27ef0 x29: ffff80008ea27f80 x28: ffff0000c4771d08 x27: ffff0000c4771d10 x26: 0000000000000008 x25: 0000000000000386 x24: dfff800000000000 x23: ffff0001adf95480 x22: ffff0000c4771d00 x21: 000000000000000a x20: ffff8000889c4480 x19: ffff0001adf95480 x18: 00000000b2517732 x17: ffff8001255d1000 x16: ffff80008ea20000 x15: 0000000000000000 x14: 0000000000000001 x13: 0000000000000001 x12: f5ff800081b32cb0 x11: ffff800080156354 x10: 0000000000000003 x9 : 0000000000000000 x8 : 000000000000911c x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000801563fc x2 : 0000000000000000 x1 : ffff0000c4771d00 x0 : ffff8001255d1000 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:606 (P) __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:510 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:522 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:527 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:590 find_stack+0x30/0x150 lib/stackdepot.c:609 (P) stack_depot_save_flags+0x1ac/0x6d8 lib/stackdepot.c:676 kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x54/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_node_noprof+0x32c/0x6ac mm/slub.c:5432 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