watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u8:3:48] Modules linked in: irq event stamp: 13439480 hardirqs last enabled at (13439479): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (13439479): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline] hardirqs last enabled at (13439479): [] irqentry_exit+0x24d/0xa00 kernel/entry/common.c:167 hardirqs last disabled at (13439480): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (13439478): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13439478): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13439478): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (13439293): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13439293): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13439293): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 0 UID: 0 PID: 48 Comm: kworker/u8:3 Tainted: G L syzkaller #0 PREEMPT(lazy) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x58e/0x1870 kernel/smp.c:912 Code: b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 a4 9b 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 a8 10 00 00 8b 45 08 31 RSP: 0018:ffffc90000b97858 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fda842 RDX: ffff888023e9be00 RSI: ffffffff81fda81c RDI: ffff888023e9be00 RBP: ffff8880b8541380 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed10170a8271 R14: 0000000000000001 R15: ffff8880b843c9c0 FS: 0000000000000000(0000) GS:ffff888123dee000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2c657eb7c0 CR3: 000000000e994000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1077 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2773 [inline] smp_text_poke_batch_finish+0x337/0xc60 arch/x86/kernel/alternative.c:2983 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x37a/0x550 kernel/jump_label.c:910 static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:911 [inline] toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:903 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 1311 Comm: syz.6.8766 Tainted: G L syzkaller #0 PREEMPT(lazy) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:__lock_acquire+0x4be/0x1a40 kernel/locking/lockdep.c:5207 Code: 48 89 de 48 89 ef e8 f1 ee ff ff 85 c0 0f 84 e9 fe ff ff 44 8b 1d 62 d7 8c 19 45 85 db 75 11 4d 63 e4 4c 0f a3 25 32 2b 84 14 <0f> 83 69 0b 00 00 48 8b b5 90 0b 00 00 45 85 ed 0f 84 93 01 00 00 RSP: 0000:ffffc90005ebfb88 EFLAGS: 00000047 RAX: 0000000000000001 RBX: ffff888085a90bc8 RCX: 0000000000000100 RDX: 0000000000000000 RSI: ffff888085a90bc8 RDI: ffff888085a90000 RBP: ffff888085a90000 R08: 0000000000000001 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fda06d3a6c0(0000) GS:ffff888123eee000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd9fc400000 CR3: 00000000448b2000 CR4: 0000000000350ef0 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166 debug_object_deactivate+0x135/0x3b0 lib/debugobjects.c:936 debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline] __run_hrtimer kernel/time/hrtimer.c:2000 [inline] __hrtimer_run_queues+0x2e9/0x9c0 kernel/time/hrtimer.c:2096 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline] __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0033:0x7fda05c55096 Code: 48 3b 57 20 0f 84 91 00 00 00 48 8b 4f 18 48 8d 72 01 48 89 77 28 0f b6 34 11 ba 08 00 00 00 39 d0 0f 4f c2 89 f1 41 0f bf 11 <4d> 8d 71 02 d1 fe 83 e1 01 44 09 e9 41 89 c9 41 29 d1 45 39 d1 7c RSP: 002b:00007fda06d39440 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000010 RCX: 000000000000002a RDX: 0000000000000001 RSI: 000000000000002a RDI: 00007fda06d395d0 RBP: 0000000000000000 R08: 0000000000000001 R09: 00007fda06d39572 R10: 0000000000000000 R11: 00007fda06d39540 R12: 0000000000000006 R13: 0000000000000000 R14: 000000000000011d R15: 00007fda06d395d0