ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [kworker/u8:16:4578] Modules linked in: irq event stamp: 6352974 hardirqs last enabled at (6352973): [] irqentry_exit+0x1dd/0x8c0 kernel/entry/common.c:219 hardirqs last disabled at (6352974): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (6352966): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (6352966): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (6352966): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 softirqs last disabled at (6352897): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (6352897): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (6352897): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 4578 Comm: kworker/u8:16 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xe02/0x15e0 kernel/smp.c:877 Code: 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 e5 5d 0c 00 f3 90 41 0f b6 45 00 <40> 38 c5 7c 08 84 c0 0f 85 b6 05 00 00 8b 43 08 31 ff 83 e0 01 41 RSP: 0018:ffffc9000d287808 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8443020 RCX: ffffffff81b28a91 RDX: ffff888033dd3d00 RSI: ffffffff81b28a6b RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: ffff888033dd4830 R12: dffffc0000000000 R13: ffffed1017088605 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881249f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc1383156c0 CR3: 000000000e184000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2921 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:874 [inline] toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:866 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31413 Comm: syz.8.8100 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline] RIP: 0010:mm_get_cid kernel/sched/sched.h:3759 [inline] RIP: 0010:sched_mm_cid_fork+0x4f6/0xcc0 kernel/sched/core.c:10578 Code: 00 00 00 00 00 fc ff df 49 c1 ef 03 4c 01 f8 48 89 04 24 eb 5d 49 c7 c4 74 96 d7 8d 41 83 e4 07 41 83 c4 03 f3 90 48 8b 04 24 <0f> b6 00 41 38 c4 7c 08 84 c0 0f 85 60 06 00 00 8b 35 b8 2f 4b 0c RSP: 0018:ffffc90004b0fd50 EFLAGS: 00000046 RAX: fffffbfff1baf2ce RBX: ffff888020f448d0 RCX: 1ffff110041e87c9 RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff888020f448d0 RBP: ffff8880589ddb80 R08: 0000000000000000 R09: fffff52000961f9c R10: 0000000000000003 R11: ffff8880589de6b0 R12: 0000000000000007 R13: ffff888020f43ec0 R14: 0000000000000002 R15: 0000000000000002 FS: 00007f6bcccc96c0(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d505ff8 CR3: 000000007a433000 CR4: 0000000000350ef0 Call Trace: bprm_execve fs/exec.c:1776 [inline] bprm_execve+0x4ff/0x1620 fs/exec.c:1729 do_execveat_common.isra.0+0x4a5/0x610 fs/exec.c:1859 do_execveat fs/exec.c:1944 [inline] __do_sys_execveat fs/exec.c:2018 [inline] __se_sys_execveat fs/exec.c:2012 [inline] __x64_sys_execveat+0xda/0x120 fs/exec.c:2012 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6bcbd8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6bcccc9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 00007f6bcbfe5fa0 RCX: 00007f6bcbd8f749 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f6bcbe13f91 R08: 0000000000001000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6bcbfe6038 R14: 00007f6bcbfe5fa0 R15: 00007ffe4df38528