ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u8:3:49] Modules linked in: irq event stamp: 3202574 hardirqs last enabled at (3202573): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (3202573): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline] hardirqs last enabled at (3202573): [] irqentry_exit+0x24d/0x7e0 kernel/entry/common.c:164 hardirqs last disabled at (3202574): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1061 softirqs last enabled at (3202572): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (3202572): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (3202572): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (3202541): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (3202541): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (3202541): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 0 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 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+0x589/0x1700 kernel/smp.c:892 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 29 84 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 RSP: 0018:ffffc90000ba7870 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fc0c7d RDX: ffff88801bfbdc40 RSI: ffffffff81fc0c57 RDI: ffff88801bfbdc40 RBP: ffff8880b8541080 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed10170a8211 R14: 0000000000000001 R15: ffff8880b843c700 FS: 0000000000000000(0000) GS:ffff88812436b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd0fbd89000 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+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:906 [inline] toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:898 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314 process_scheduled_works kernel/workqueue.c:3397 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478 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: 12905 Comm: syz.4.2137 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline] RIP: 0010:mm_get_cid kernel/sched/sched.h:3880 [inline] RIP: 0010:sched_mm_cid_fork+0x4e8/0xef0 kernel/sched/core.c:10954 Code: 6c 24 20 48 b8 00 00 00 00 00 fc ff df 49 01 c6 4c 89 f5 eb 5a 49 c7 c6 ac 50 1d 8e 41 83 e6 07 41 83 c6 03 f3 90 0f b6 45 00 <41> 38 c6 7c 08 84 c0 0f 85 aa 07 00 00 8b 35 81 bf 47 0c 48 89 df RSP: 0018:ffffc90009f1fc50 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88802c6aa410 RCX: 0000000000000001 RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff88802c6aa410 RBP: fffffbfff1c3aa15 R08: 0000000000000000 R09: fffff520013e3f7c R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000002 R14: 0000000000000007 R15: ffff88802ded5c40 FS: 00007f2b4259d6c0(0000) GS:ffff88812446b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7a3f3ea540 CR3: 00000000673de000 CR4: 0000000000350ef0 Call Trace: bprm_execve fs/exec.c:1771 [inline] bprm_execve+0x53f/0x1740 fs/exec.c:1724 do_execveat_common.isra.0+0x4a5/0x580 fs/exec.c:1846 __do_sys_execveat fs/exec.c:1941 [inline] __se_sys_execveat fs/exec.c:1934 [inline] __x64_sys_execveat+0xdf/0x130 fs/exec.c:1934 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: 0033:0x7f2b4179ce59 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:00007f2b4259d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 00007f2b41a15fa0 RCX: 00007f2b4179ce59 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f2b41832d6f R08: 0000000000001000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2b41a16038 R14: 00007f2b41a15fa0 R15: 00007ffd106092e8