ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#1 stuck for 226s! [kworker/u8:3:49] Modules linked in: irq event stamp: 2355180 hardirqs last enabled at (2355179): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (2355179): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline] hardirqs last enabled at (2355179): [] irqentry_exit+0x24d/0xa00 kernel/entry/common.c:167 hardirqs last disabled at (2355180): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (2355172): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (2355172): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (2355172): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (2355167): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (2355167): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (2355167): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 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+0x593/0x1870 kernel/smp.c:912 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 54 99 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 ff 83 e0 01 41 RSP: 0018:ffffc90000ba7858 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fda5f2 RDX: ffff88801c36be00 RSI: ffffffff81fda5cc RDI: ffff88801c36be00 RBP: ffff8880b84434e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed101708869d R14: 0000000000000001 R15: ffff8880b853c9c0 FS: 0000000000000000(0000) GS:ffff888123ede000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f58663eb158 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7657 Comm: syz.0.526 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:114 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:128 [inline] RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline] RIP: 0010:_raw_spin_lock_irqsave+0xb/0x60 kernel/locking/spinlock.c:166 Code: 8b eb 55 f6 eb c9 66 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 55 53 48 89 fb 9c 5d f7 c5 00 02 00 00 75 39 bf 01 00 00 00 e8 a2 f2 18 f6 ff 74 24 RSP: 0018:ffffc90000007d58 EFLAGS: 00000016 RAX: ffffffff9b94e058 RBX: ffffffff9b94e058 RCX: 61c8864680b583eb RDX: 0000000000000120 RSI: ffffffff9b94e050 RDI: ffffffff9b94e058 RBP: 0000000000000016 R08: 0000000000000005 R09: ffffc90000007d90 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888029755300 R14: 0000000000000001 R15: 1ffff92000000fb2 FS: 00007f810b1cc6c0(0000) GS:ffff888123dde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000141030 CR3: 0000000054ed6000 CR4: 0000000000350ef0 Call Trace: debug_object_activate+0x144/0x4b0 lib/debugobjects.c:873 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline] debug_activate kernel/time/hrtimer.c:528 [inline] enqueue_hrtimer+0x75/0x2f0 kernel/time/hrtimer.c:1109 __run_hrtimer kernel/time/hrtimer.c:2048 [inline] __hrtimer_run_queues+0x6ed/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+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_is_held_type+0xf5/0x140 kernel/locking/lockdep.c:5945 Code: ff ff ff ff 65 0f c1 15 19 b5 aa 08 83 fa 01 8b 44 24 04 75 2d 9c 5a 80 e6 02 75 47 41 f7 c5 00 02 00 00 74 01 fb 48 83 c4 08 <5b> 5d 41 5c 41 5d 41 5e 41 5f e9 27 8f 56 f5 e9 22 8f 56 f5 31 c0 RSP: 0018:ffffc900082c7bf0 EFLAGS: 00000296 RAX: 0000000000000000 RBX: ffffffff8ebe80c0 RCX: 0000000000000001 RDX: 0000000000000046 RSI: ffffffff8e1840ee RDI: ffffffff8c400980 RBP: ffff888026738000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff R13: 0000000000000246 R14: 0000200000141180 R15: 0000000000010106 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0x29f/0x330 kernel/sched/core.c:9159 __might_fault+0x8b/0x140 mm/memory.c:7290 do_recvmmsg+0x31c/0x740 net/socket.c:3047 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3131 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f810a39de99 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:00007f810b1cc028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f810a626090 RCX: 00007f810a39de99 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f810a433eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f810a626128 R14: 00007f810a626090 R15: 00007ffcf0c1eba8