watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.3.64:6171] Modules linked in: irq event stamp: 13167633 hardirqs last enabled at (13167632): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (13167633): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (11739402): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (11739402): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (11739402): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (11739405): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (11739405): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (11739405): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 6171 Comm: syz.3.64 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:do_perf_trace_lock include/trace/events/lock.h:50 [inline] RIP: 0010:perf_trace_lock+0xec/0x3b0 include/trace/events/lock.h:50 Code: 49 89 c5 49 8d 5e 60 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 51 2b 89 00 48 8b 03 48 89 44 24 10 e8 34 9a a9 09 <89> c3 83 f8 08 0f 83 4a 02 00 00 48 8d 1c dd d0 bd 92 8d 48 89 d8 RSP: 0018:ffffc90000006c80 EFLAGS: 00000282 RAX: 0000000000000000 RBX: ffffffff8de0c160 RCX: 302b52e8c0c04000 RDX: ffffffff81738d25 RSI: ffffffff8bbf03c0 RDI: ffffffff8bbf0380 RBP: ffffc90000006d80 R08: 0000000000000018 R09: ffffffff81738d25 R10: ffffc900000069c8 R11: fffff52000000d3b R12: 1ffff92000000d98 R13: 000000000000000d R14: ffffffff8de0c100 R15: dffffc0000000000 FS: 00007fddbfa616c0(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c33ad97 CR3: 0000000023fa8000 CR4: 00000000003526f0 Call Trace: __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2530 [inline] slab_free mm/slub.c:6619 [inline] kmem_cache_free+0x19b/0x690 mm/slub.c:6729 arp_process+0xee8/0x17a0 net/ipv4/arp.c:941 NF_HOOK+0x310/0x3a0 include/linux/netfilter.h:-1 __netif_receive_skb_list_ptype net/core/dev.c:6127 [inline] __netif_receive_skb_list_core+0x439/0x800 net/core/dev.c:6159 __netif_receive_skb_list net/core/dev.c:6221 [inline] netif_receive_skb_list_internal+0x96f/0xcb0 net/core/dev.c:6312 gro_normal_list include/net/gro.h:524 [inline] gro_normal_one include/net/gro.h:544 [inline] gro_skb_finish net/core/gro.c:603 [inline] gro_receive_skb+0x642/0xce0 net/core/gro.c:633 receive_buf+0xa0e/0x15e0 drivers/net/virtio_net.c:2643 virtnet_receive_packets drivers/net/virtio_net.c:2991 [inline] virtnet_receive drivers/net/virtio_net.c:3015 [inline] virtnet_poll+0x1fbc/0x2d80 drivers/net/virtio_net.c:3109 __napi_poll+0xc7/0x360 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x5f7/0xdf0 net/core/dev.c:7784 handle_softirqs+0x286/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7256 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 ab a4 48 f6 e8 36 77 80 f6 fb bf 01 00 00 00 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc900058a7c40 EFLAGS: 00000286 RAX: 302b52e8c0c04000 RBX: ffff88802f3c0000 RCX: 302b52e8c0c04000 RDX: 0000000000000000 RSI: ffffffff8d70beba RDI: 0000000000000001 RBP: ffffc900058a7ce0 R08: ffffffff8f7cd177 R09: 1ffffffff1ef9a2e R10: dffffc0000000000 R11: fffffbfff1ef9a2f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000b14f88 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline] RIP: 0010:lock_is_held_type+0x65/0x190 kernel/locking/lockdep.c:5936 Code: 85 ef 00 00 00 65 4c 8b 2c 25 08 20 6e 92 41 83 bd 2c 0b 00 00 00 0f 85 d8 00 00 00 89 f5 49 89 fe 48 c7 04 24 00 00 00 00 9c <8f> 04 24 4c 8b 24 24 fa 48 c7 c7 43 02 72 8d e8 07 17 00 00 65 ff RSP: 0018:ffffc900058a7da0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 302b52e8c0c04000 RDX: ffff88802f3c0000 RSI: 00000000ffffffff RDI: ffffffff8df3d2e0 RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff891c480c R10: ffffc900058a79c8 R11: fffff52000b14f3b R12: ffffffff8c719da0 R13: ffff88802f3c0000 R14: ffffffff8df3d2e0 R15: 0000000000000003 __sock_create+0x416/0x9f0 net/socket.c:1590 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fddbeb8efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fddbfa61038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fddbede5fa0 RCX: 00007fddbeb8efc9 RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007fddbec11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fddbede6038 R14: 00007fddbede5fa0 R15: 00007ffe2f03da38 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6189 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd38/0x12d0 kernel/smp.c:877 Code: 89 ee 83 e6 01 31 ff e8 96 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 41 6f 0b 00 eb 38 f3 90 42 0f b6 04 2b <84> c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 25 6f 0b 00 eb e4 44 RSP: 0018:ffffc9000bacf640 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff11017108431 RCX: ffff88807b3bdac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000bacf7c0 R08: ffffffff8f7cd177 R09: 1ffffffff1ef9a2e R10: dffffc0000000000 R11: fffffbfff1ef9a2f R12: ffff8880b8842188 R13: dffffc0000000000 R14: ffff8880b893b1c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f453f99b000 CR3: 000000000dd38000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline] smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2923 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:852 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245