ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [kworker/u8:2:17734] Modules linked in: irq event stamp: 2067486 hardirqs last enabled at (2067485): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline] hardirqs last enabled at (2067485): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:550 [inline] hardirqs last enabled at (2067485): [] irqentry_exit+0x24d/0x7e0 kernel/entry/common.c:164 hardirqs last disabled at (2067486): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1061 softirqs last enabled at (2067484): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (2067484): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (2067484): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (2067451): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (2067451): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (2067451): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 17734 Comm: kworker/u8:2 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x58e/0x1700 kernel/smp.c:892 Code: 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 69 83 0c 00 f3 90 41 0f b6 45 00 <41> 38 c4 7c 08 84 c0 0f 85 63 0f 00 00 8b 45 08 31 ff 83 e0 01 41 RSP: 0018:ffffc9000c757870 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fc127d RDX: ffff888023ac8000 RSI: ffffffff81fc1257 RDI: ffff888023ac8000 RBP: ffff8880b8443180 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed1017088631 R14: 0000000000000001 R15: ffff8880b853c700 FS: 0000000000000000(0000) GS:ffff888124471000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe0d2fea540 CR3: 000000000e596000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057 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+0x976/0xc60 arch/x86/kernel/alternative.c:3045 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_disable_cpuslocked+0x162/0x1c0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate mm/kfence/core.c:913 [inline] toggle_allocation_gate+0x149/0x2d0 mm/kfence/core.c:898 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 19395 Comm: syz.9.3650 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:rol32 include/linux/bitops.h:126 [inline] RIP: 0010:iterate_chain_key kernel/locking/lockdep.c:451 [inline] RIP: 0010:__lock_acquire+0x551/0x2630 kernel/locking/lockdep.c:5225 Code: 66 41 81 e1 ff 1f c1 e0 0d 44 09 c8 98 44 29 c0 31 f8 89 f7 89 c6 29 c7 01 d0 c1 c6 06 31 fe 89 f7 29 f2 01 c6 c1 c7 08 31 d7 <89> fa 29 f8 01 f7 c1 c2 10 41 89 f8 31 c2 89 d0 29 d6 01 fa c1 c8 RSP: 0018:ffffc90000007d30 EFLAGS: 00000086 RAX: 00000000ffffff8c RBX: ffff888032620b90 RCX: 0000000000000000 RDX: 0000000000001c30 RSI: 00000000ffffe35a RDI: 00000000ffe3d2cf RBP: ffff888032620000 R08: 00000000ffffffff R09: 0000000000000070 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000070 R14: 0000000000000000 R15: 0000000000000002 FS: 00007fe0d3da96c0(0000) GS:ffff888124371000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe0d3da8ff8 CR3: 0000000022361000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:174 __run_hrtimer kernel/time/hrtimer.c:1934 [inline] __hrtimer_run_queues+0x1bd/0xa00 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:do_futex+0x4/0x350 kernel/futex/syscalls.c:114 Code: ff e8 80 54 7a 00 e9 0f ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> b8 00 00 00 00 00 fc ff df 41 57 41 56 49 89 ce 41 55 49 89 fd RSP: 0018:ffffc90007b37e18 EFLAGS: 00000287 RAX: 0000000000000178 RBX: 1ffff92000f66fca RCX: 0000000000000000 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe0d321609c RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000081 R14: ffffc90007b37e90 R15: 0000000000000000 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex kernel/futex/syscalls.c:188 [inline] __x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe0d2f9ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe0d3da90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fe0d3216098 RCX: 00007fe0d2f9ce59 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe0d321609c RBP: 00007fe0d3216090 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe0d3216128 R14: 00007ffdf768d390 R15: 00007ffdf768d478