ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#1 stuck for 244s! [kworker/u8:22:9650] 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: 9650 Comm: kworker/u8:22 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+0x5b0/0x16c0 kernel/smp.c:892 Code: 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 89 c6 89 c6 e8 33 90 0c 00 45 85 f6 <75> d0 e8 79 95 0c 00 e8 74 95 0c 00 83 c3 01 bf 07 00 00 00 48 63 RSP: 0018:ffffc90004eff878 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fca87d RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff888032255d00 RBP: ffff8880b8443360 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed101708866d R14: 0000000000000001 R15: ffff8880b853c840 FS: 0000000000000000(0000) GS:ffff88812441a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f57c153c38e 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: 14337 Comm: syz.6.1727 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:debug_object_activate+0x5e/0x490 lib/debugobjects.c:860 Code: 48 c7 44 24 28 c8 dd f6 8d 4d 89 cf 48 c7 44 24 30 70 93 07 85 49 c1 ef 03 4b 8d 04 27 c7 00 f1 f1 f1 f1 c7 40 04 f1 f1 00 00 40 08 00 00 00 f3 c7 40 0c f3 f3 f3 f3 65 48 8b 05 24 cc 08 0f RSP: 0018:ffffc90000007d70 EFLAGS: 00000016 RAX: fffff52000000fb2 RBX: ffff8880b8428540 RCX: ffffffff81f4be58 RDX: ffff88802d67be00 RSI: ffffffff8bb2f940 RDI: ffff888022ea0300 RBP: ffffc90000007e58 R08: 0000000000000005 R09: ffffc90000007d90 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff92000000fb2 FS: 00007f8755c1e6c0(0000) GS:ffff88812431a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2c417ea540 CR3: 00000000622a6000 CR4: 0000000000350ef0 Call Trace: debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline] debug_activate kernel/time/hrtimer.c:528 [inline] enqueue_hrtimer+0x75/0x2f0 kernel/time/hrtimer.c:1109 __run_hrtimer kernel/time/hrtimer.c:2048 [inline] __hrtimer_run_queues+0x6ed/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:preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7552 Code: 00 00 00 fc ff df 48 89 eb 48 c1 eb 03 48 01 d3 f6 c4 02 75 47 bf 01 00 00 00 e8 d0 11 3e f6 e8 0b 06 7b f6 fb bf 01 00 00 00 d0 90 ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 be b1 3d RSP: 0018:ffffc900070d7688 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffffed1005acf7c0 RCX: ffffffff8211890f RDX: 0000000000000000 RSI: ffffffff8c1d2b80 RDI: 0000000000000001 RBP: ffff88802d67be00 R08: 0000000000000000 R09: fffffbfff21b4a52 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x205/0xa00 kernel/entry/common.c:167 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679 RIP: 0010:__skb_try_recv_datagram+0xde/0x500 net/core/datagram.c:254 Code: 00 31 ff 44 89 e6 e8 51 9e a4 f8 45 85 e4 0f 85 76 03 00 00 e8 93 a3 a4 f8 c7 44 24 68 00 00 00 00 e8 86 a3 a4 f8 8b 6c 24 0c <31> ff 83 e5 40 89 ee e8 26 9e a4 f8 85 ed b8 00 00 00 00 48 c7 c2 RSP: 0018:ffffc900070d7790 EFLAGS: 00000246 RAX: 0000000000080000 RBX: ffff888012c10880 RCX: ffffc90024806000 RDX: 0000000000080000 RSI: ffffffff89649a7a RDI: ffff88802d67be00 RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc900070d78e8 R14: ffff888012c10968 R15: ffffc900070d78f8 __unix_dgram_recvmsg+0x1bc/0xc30 net/unix/af_unix.c:2582 unix_dgram_recvmsg+0xcd/0x100 net/unix/af_unix.c:2681 sock_recvmsg_nosec net/socket.c:1126 [inline] ____sys_recvmsg+0x5eb/0x670 net/socket.c:2902 ___sys_recvmsg+0x16a/0x1a0 net/socket.c:2946 do_recvmmsg+0x2f3/0x740 net/socket.c:3041 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3131 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: 0033:0x7f8754d9ce59 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:00007f8755c1e028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f8755016090 RCX: 00007f8754d9ce59 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004 RBP: 00007f8754e32e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8755016128 R14: 00007f8755016090 R15: 00007fff054ae4d8