ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [kworker/u8:38:21513] 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:2233 softirqs last enabled at (0): [] copy_process+0x28de/0x7ff0 kernel/fork.c:2234 softirqs last disabled at (0): [<0000000000000000>] 0x0 CPU: 1 UID: 0 PID: 21513 Comm: kworker/u8:38 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+0x58e/0x16c0 kernel/smp.c:892 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 a9 95 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 ff 83 e0 01 41 RSP: 0018:ffffc900038cf878 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fca87d RDX: ffff8880771add00 RSI: ffffffff81fca857 RDI: ffff8880771add00 RBP: ffff8880b8443360 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed101708866d R14: 0000000000000001 R15: ffff8880b853c840 FS: 0000000000000000(0000) GS:ffff88812441b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000080 CR3: 000000000e592000 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+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: 21897 Comm: syz.2.3808 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:base_update_next_timer kernel/time/hrtimer.c:1128 [inline] RIP: 0010:__remove_hrtimer+0x239/0x440 kernel/time/hrtimer.c:1162 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e1 01 00 00 49 8b 47 28 48 89 44 24 08 e8 a0 6c 14 00 48 8d 7d 48 48 8b 44 24 08 <48> ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 11 00 0f RSP: 0018:ffffc90000007e50 EFLAGS: 00000046 RAX: 7fffffffffffffff RBX: ffff88802db72300 RCX: 0000000000000001 RDX: ffff888028758000 RSI: ffffffff81f4d160 RDI: ffff8880b8428588 RBP: ffff8880b8428540 R08: 0000000000000005 R09: 000000000000001f R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8880b8428400 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1b33d896c0(0000) GS:ffff88812431b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005c9d6000 CR4: 0000000000350ef0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:2012 [inline] __hrtimer_run_queues+0x352/0x9c0 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 bd 4c f6 48 89 df e8 de 0c 4d f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 1e 3c f6 65 8b 05 ae 38 78 08 85 c0 74 16 5b RSP: 0018:ffffc900056d7b28 EFLAGS: 00000246 RAX: 0000000000000046 RBX: ffffffff9b2003d8 RCX: ffffffff8211890f RDX: 0000000000000000 RSI: ffffffff8c1d2a80 RDI: ffffffff8b981792 RBP: 0000000000000286 R08: 0000000000000000 R09: fffffbfff21b4932 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff9b200140 R13: 0000000000000000 R14: ffffc900056d7c80 R15: 7fffffffffffffff class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline] __do_adjtimex+0x892/0xe70 kernel/time/timekeeping.c:2952 do_adjtimex+0xa0/0x370 kernel/time/timekeeping.c:2995 do_clock_adjtime kernel/time/posix-timers.c:1169 [inline] __do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1181 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: 0033:0x7f1b35f9ce59 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:00007f1b33d89028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f1b36216270 RCX: 00007f1b35f9ce59 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000 RBP: 00007f1b36032e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1b36216308 R14: 00007f1b36216270 R15: 00007ffd2cc7fb98