watchdog: BUG: soft lockup - CPU#0 stuck for 263s! [kworker/u8:8:1088] Modules linked in: irq event stamp: 4477052 hardirqs last enabled at (4477051): [] irqentry_exit+0x180/0x670 kernel/entry/common.c:242 hardirqs last disabled at (4477052): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (4477024): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (4477024): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (4477024): [] __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723 softirqs last disabled at (4476999): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (4476999): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (4476999): [] __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 1088 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x57e/0x1500 kernel/smp.c:877 Code: b8 00 00 00 00 00 fc ff df 48 8b 54 24 10 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 34 5f 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 91 0d 00 00 8b 45 08 31 RSP: 0018:ffffc90004e1f878 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fc1e92 RDX: ffff888028d91e40 RSI: ffffffff81fc1e6c RDI: ffff888028d91e40 RBP: ffff8880b8540e60 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed10170a81cd R14: 0000000000000001 R15: ffff8880b843c500 FS: 0000000000000000(0000) GS:ffff888124348000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeb0ee81a8 CR3: 000000000e598000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2746 [inline] smp_text_poke_batch_finish+0x337/0xc60 arch/x86/kernel/alternative.c:2956 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x37a/0x550 kernel/jump_label.c:919 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:900 [inline] toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:892 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275 process_scheduled_works kernel/workqueue.c:3358 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3439 kthread+0x370/0x450 kernel/kthread.c:467 ret_from_fork+0x754/0xd80 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: 8248 Comm: syz.9.424 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline] RIP: 0010:mm_get_cid kernel/sched/sched.h:3839 [inline] RIP: 0010:sched_mm_cid_fork+0x52a/0xcd0 kernel/sched/core.c:10704 Code: 12 8e 48 b8 00 00 00 00 00 fc ff df 49 c1 ef 03 4c 01 f8 48 89 04 24 eb 5d 49 c7 c4 34 d0 12 8e 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 4f 06 00 00 8b 35 RSP: 0018:ffffc9000567fce8 EFLAGS: 00000046 RAX: 0000000000000002 RBX: ffff88802b1b5510 RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff88802b1b5510 RBP: ffff888012adbc80 R08: 0000000000000001 R09: fffff52000acff8f R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000007 R13: ffff88802b1b4af8 R14: 0000000000000002 R15: 0000000000000002 FS: 00007f5302a986c0(0000) GS:ffff888124448000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000153030 CR3: 000000002b51b000 CR4: 0000000000350ef0 Call Trace: bprm_execve fs/exec.c:1771 [inline] bprm_execve+0x53f/0x1680 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+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5301b9c799 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:00007f5302a98028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 00007f5301e15fa0 RCX: 00007f5301b9c799 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000005 RBP: 00007f5301c32bd9 R08: 0000000000001000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5301e16038 R14: 00007f5301e15fa0 R15: 00007ffdb915f6a8