ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#1 stuck for 222s! [kworker/u8:1:13] Modules linked in: irq event stamp: 0 hardirqs last enabled at (0): [<0000000000000000>] 0x0 hardirqs last disabled at (0): [] copy_process+0x288a/0x7ff0 kernel/fork.c:2232 softirqs last enabled at (0): [] copy_process+0x28de/0x7ff0 kernel/fork.c:2233 softirqs last disabled at (0): [<0000000000000000>] 0x0 CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x589/0x16c0 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 b9 81 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 2c 0f 00 00 8b 45 08 31 RSP: 0018:ffffc90000127878 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fcebcd RDX: ffff88801e2cdd00 RSI: ffffffff81fceba7 RDI: ffff88801e2cdd00 RBP: ffff8880b8443320 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed1017088665 R14: 0000000000000001 R15: ffff8880b853c840 FS: 0000000000000000(0000) GS:ffff88812447d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000006ac0 CR3: 000000000e596000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 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+0xa23/0x1940 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 28861 Comm: syz.4.5710 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__mm_get_cid kernel/sched/sched.h:3921 [inline] RIP: 0010:mm_get_cid kernel/sched/sched.h:3934 [inline] RIP: 0010:sched_mm_cid_fork+0x544/0xeb0 kernel/sched/core.c:10987 Code: 83 c6 03 f3 90 0f b6 45 00 41 38 c6 7c 08 84 c0 0f 85 23 07 00 00 8b 35 56 c0 47 0c 48 89 df 49 89 f5 e8 8f 55 22 03 41 89 c4 <44> 39 e8 73 d4 41 89 c5 be 08 00 00 00 4c 89 e8 48 c1 f8 06 48 8d RSP: 0018:ffffc9000716fc50 EFLAGS: 00000082 RAX: 0000000000000002 RBX: ffff8880a29c7ed0 RCX: 0000000000000001 RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff8880a29c7ed0 RBP: fffffbfff1c3a615 R08: 0000000000000000 R09: fffff52000e2df7c R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000002 R14: 0000000000000007 R15: ffff8880273ebe00 FS: 00007f37371f66c0(0000) GS:ffff88812437d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c330c9c CR3: 000000008baa2000 CR4: 0000000000350ef0 Call Trace: bprm_execve fs/exec.c:1801 [inline] bprm_execve+0x53f/0x1730 fs/exec.c:1754 do_execveat_common.isra.0+0x4a5/0x580 fs/exec.c:1876 __do_sys_execveat fs/exec.c:1960 [inline] __se_sys_execveat fs/exec.c:1953 [inline] __x64_sys_execveat+0xdf/0x130 fs/exec.c:1953 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: 0033:0x7f3738f9ce59 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:00007f37371f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 00007f3739215fa0 RCX: 00007f3738f9ce59 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000006 RBP: 00007f3739032d6f R08: 0000000000001000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3739216038 R14: 00007f3739215fa0 R15: 00007ffd95951c68