ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [kworker/u8:4:57] Modules linked in: irq event stamp: 2225050 hardirqs last enabled at (2225049): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (2225049): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline] hardirqs last enabled at (2225049): [] irqentry_exit+0x24d/0xa00 kernel/entry/common.c:167 hardirqs last disabled at (2225050): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (2225048): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (2225048): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (2225048): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (2225043): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (2225043): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (2225043): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 57 Comm: kworker/u8:4 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 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 03 90 0c 00 45 85 f6 <75> d0 e8 89 95 0c 00 e8 84 95 0c 00 83 c3 01 bf 07 00 00 00 48 63 RSP: 0018:ffffc900015e7878 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fd25ed RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88801cbc1f00 RBP: ffff8880b84434e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed101708869d R14: 0000000000000001 R15: ffff8880b853c9c0 FS: 0000000000000000(0000) GS:ffff888123ee6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32e1cff8 CR3: 000000000e992000 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:911 [inline] toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:903 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: 12780 Comm: syz.2.1701 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 RIP: 0010:rcu_is_watching+0x0/0xc0 kernel/rcu/tree.c:748 Code: 3a ff ff ff 48 89 df e8 9e 86 8b 00 eb 81 e8 c7 86 8b 00 e9 49 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 53 65 ff 05 33 dc 75 12 e8 3e 37 cb 09 48 c7 c3 68 RSP: 0018:ffffc90000007e90 EFLAGS: 00000046 RAX: 0000000080010000 RBX: dffffc0000000000 RCX: ffffffff81f572d4 RDX: ffff88803412dd00 RSI: ffffffff81f5762b RDI: ffff88803412dd00 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888029b21300 R13: ffffffff89c62c90 R14: ffff8880b8428540 R15: ffff8880b8428590 FS: 00007fb0712fe6c0(0000) GS:ffff888123de6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8306f66b4c CR3: 000000007cb42000 CR4: 0000000000350ef0 Call Trace: trace_hrtimer_expire_entry include/trace/events/timer.h:261 [inline] __run_hrtimer kernel/time/hrtimer.c:2029 [inline] __hrtimer_run_queues+0x730/0x9c0 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:__skb_datagram_iter+0x641/0x900 net/core/datagram.c:419 Code: 48 8b 94 24 a0 00 00 00 48 8b 44 24 08 e8 57 91 35 02 48 89 c5 eb 9d e8 8d 37 83 f8 90 0f 0b 90 e9 c7 fd ff ff 44 8b 7c 24 5c 97 fb ff ff 44 8b 6c 24 04 49 89 ee e8 6d 37 83 f8 49 8d 7e 08 RSP: 0018:ffffc900039af790 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff89867e6e RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88803412dd00 RBP: ffff88802ea74140 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc900039afd98 R15: 0000000000000000 skb_copy_datagram_iter+0xa1/0x250 net/core/datagram.c:535 skb_copy_datagram_msg include/linux/skbuff.h:4244 [inline] __unix_dgram_recvmsg+0x44b/0xc30 net/unix/af_unix.c:2624 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: 0033:0x7fb07039de99 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:00007fb0712fe028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007fb070626090 RCX: 00007fb07039de99 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007fb070433eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb070626128 R14: 00007fb070626090 R15: 00007ffc97487ce8