watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.6.701:8898] Modules linked in: irq event stamp: 14889559 hardirqs last enabled at (14889558): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (14889559): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (14713514): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (14713514): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (14713514): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (14713517): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (14713517): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (14713517): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 8898 Comm: syz.6.701 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lock_release+0x33b/0x3b0 kernel/locking/lockdep.c:-1 Code: 48 8d 3d b8 bd e6 0d 67 48 0f b9 3a e9 1f fe ff ff e8 f9 06 bd 09 48 c7 c7 f0 1b e1 8d 4c 89 ee e8 4a 68 29 03 e9 c8 fd ff ff 0f 1e fa 4d 89 f7 4c 89 eb 65 8b 05 28 06 e0 10 83 f8 08 73 55 RSP: 0018:ffffc900000070f0 EFLAGS: 00000286 RAX: 18dc19efdc26e800 RBX: ffffffff9022c401 RCX: 18dc19efdc26e800 RDX: ffffc90000007201 RSI: ffffffff81743f85 RDI: ffffffff8df41a20 RBP: dffffc0000000000 R08: ffffc900000075a0 R09: 0000000000000000 R10: ffffc90000007278 R11: fffff52000000e51 R12: ffffc900000075b0 R13: ffffffff81743f85 R14: ffffffff8df41a20 R15: ffffffff81743f85 FS: 00007f637b7d56c0(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000c2c0 CR3: 0000000028498000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695 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 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_mempool_unpoison_object+0x9f/0x130 mm/kasan/common.c:563 kasan_mempool_unpoison_object include/linux/kasan.h:390 [inline] napi_skb_cache_get+0x3c9/0x780 net/core/skbuff.c:305 __alloc_skb+0x1a7/0x430 net/core/skbuff.c:668 napi_alloc_skb+0x84/0x7c0 net/core/skbuff.c:832 page_to_skb+0x2ce/0x870 drivers/net/virtio_net.c:904 receive_mergeable drivers/net/virtio_net.c:2514 [inline] receive_buf+0x527/0x1900 drivers/net/virtio_net.c:2660 virtnet_receive_packets drivers/net/virtio_net.c:3023 [inline] virtnet_receive drivers/net/virtio_net.c:3047 [inline] virtnet_poll+0x20f6/0x2ee0 drivers/net/virtio_net.c:3136 __napi_poll+0xae/0x320 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x672/0xe50 net/core/dev.c:7881 handle_softirqs+0x27d/0x850 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:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__schedule+0x8e/0x5000 kernel/sched/core.c:6719 Code: 8b 48 8d 8c 24 20 01 00 00 48 c1 e9 03 48 b8 f1 f1 f1 f1 00 00 00 f2 4a 89 04 31 48 b8 f2 f2 f2 f2 00 f2 f2 f2 4a 89 44 31 08 <48> 89 8c 24 f8 00 00 00 66 42 c7 44 31 12 f3 f3 ba 10 00 00 00 31 RSP: 0018:ffffc900052c7460 EFLAGS: 00000a02 RAX: f2f2f200f2f2f2f2 RBX: ffff88802ecb3d00 RCX: 1ffff92000a58eb0 RDX: 0000000000000000 RSI: ffffffff8d7922ac RDI: ffffc900052c7600 RBP: ffffc900052c7670 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000000 R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff92000a58ed0 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 d4 38 e0 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc900052c7838 EFLAGS: 00000206 RAX: 18dc19efdc26e800 RBX: 0000000000000000 RCX: 18dc19efdc26e800 RDX: 000000005a44979c RSI: ffffffff8d978ff2 RDI: ffffffff8bc08360 RBP: ffffffff81743f85 R08: ffffffff81743f85 R09: ffffffff8df41a20 R10: ffffc900052c79f8 R11: ffffffff81ada120 R12: 0000000000000002 R13: ffffffff8df41a20 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 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 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_lru_noprof+0x36c/0x6e0 mm/slub.c:5282 sock_alloc_inode+0x28/0xc0 net/socket.c:322 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:2964 [inline] sock_alloc net/socket.c:637 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1569 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/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f637a98f749 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:00007f637b7d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f637abe6180 RCX: 00007f637a98f749 RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f637aa13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f637abe6218 R14: 00007f637abe6180 R15: 00007ffc54622848 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8888 Comm: syz.8.700 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline] RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline] RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline] RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:212 Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc f3 0f 1e fa 89 f6 31 d2 e9 f2 fd 55 03 66 RSP: 0018:ffffc90000a07f38 EFLAGS: 00000046 RAX: 0000000000000188 RBX: ffff8880b8723e40 RCX: 0000000000000838 RDX: 0000000000000000 RSI: 0000000000000188 RDI: 0000000000000838 RBP: 0000000000000000 R08: ffffffff81af68b5 R09: ffffffff998e3508 R10: 0000000000000003 R11: ffffffff81718b10 R12: 0000000010009551 R13: dffffc0000000000 R14: 0000000000000188 R15: 0000000000000020 FS: 00007f086d5626c0(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f74f0492e80 CR3: 0000000032e5a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: apic_write arch/x86/include/asm/apic.h:409 [inline] lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:418 clockevents_program_event+0x1c9/0x350 kernel/time/clockevents.c:334 hrtimer_interrupt+0x620/0xaa0 kernel/time/hrtimer.c:1916 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__find_rr_leaf+0x12d/0x6d0 net/ipv6/route.c:837 Code: 44 24 68 4c 89 7c 24 30 4d 85 ff 74 3c 49 8d 9e 90 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 7e 03 00 00 8b 1b <89> df 44 8b 64 24 44 44 89 e6 e8 74 a6 b3 f7 44 39 e3 0f 85 07 04 RSP: 0018:ffffc90000a081a0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000100 RCX: ffff88802fb48000 RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000a082f8 R08: ffffc90000a08420 R09: ffffc90000a08430 R10: ffffc90000a08280 R11: fffff52000141052 R12: 1ffff1100d7b758c R13: dffffc0000000000 R14: ffff88805562cc00 R15: ffffc90000a083f8 find_rr_leaf net/ipv6/route.c:889 [inline] rt6_select net/ipv6/route.c:933 [inline] fib6_table_lookup+0x39f/0xa80 net/ipv6/route.c:2233 ip6_pol_route+0x222/0x1180 net/ipv6/route.c:2269 pol_lookup_func include/net/ip6_fib.h:617 [inline] fib6_rule_lookup+0x52f/0x6f0 net/ipv6/fib6_rules.c:120 ip6_route_input_lookup net/ipv6/route.c:2338 [inline] ip6_route_input+0x6de/0xad0 net/ipv6/route.c:2641 ip6_rcv_finish+0x141/0x2e0 net/ipv6/ip6_input.c:77 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6137 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6250 process_backlog+0x622/0x1500 net/core/dev.c:6602 __napi_poll+0xae/0x320 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x672/0xe50 net/core/dev.c:7881 handle_softirqs+0x27d/0x850 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:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194 Code: 74 05 e8 7b 3a 6b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 53 be 32 f6 65 8b 05 ec 60 20 07 85 c0 74 40 48 c7 04 24 0e 36 RSP: 0018:ffffc900046feba0 EFLAGS: 00000206 RAX: 36fad395a0927700 RBX: 0000000000000246 RCX: 36fad395a0927700 RDX: 0000000000000006 RSI: ffffffff8d7922ac RDI: 0000000000000001 RBP: ffffc900046fec38 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: dffffc0000000000 R13: 0000000000000000 R14: ffffffff8e6a8370 R15: 1ffff920008dfd74 stack_depot_save_flags+0x422/0x850 lib/stackdepot.c:720 kasan_save_stack+0x4d/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14c4/0x5000 kernel/sched/core.c:6863 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7047 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7071 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2414 [inline] rcu_preempt_deferred_qs_irqrestore+0xa11/0xce0 kernel/rcu/tree_plugin.h:571 rcu_read_unlock_special+0x3d8/0x520 kernel/rcu/tree_plugin.h:769 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:899 [inline] pte_unmap include/linux/pgtable.h:136 [inline] __text_poke+0x88a/0x9f0 arch/x86/kernel/alternative.c:2586 text_poke arch/x86/kernel/alternative.c:2610 [inline] smp_text_poke_batch_finish+0x90a/0x1130 arch/x86/kernel/alternative.c:2943 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 tracepoint_add_func+0x994/0xa10 kernel/tracepoint.c:315 tracepoint_probe_register_prio kernel/tracepoint.c:464 [inline] tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:484 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x4e1/0x9d0 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x8d/0x120 kernel/events/core.c:10941 perf_try_init_event+0x17f/0x870 kernel/events/core.c:12684 perf_init_event kernel/events/core.c:12782 [inline] perf_event_alloc+0x1430/0x2d50 kernel/events/core.c:13057 __do_sys_perf_event_open kernel/events/core.c:13575 [inline] __se_sys_perf_event_open+0x756/0x1d90 kernel/events/core.c:13456 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f086c78f749 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:00007f086d562038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f086c9e5fa0 RCX: 00007f086c78f749 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000000c0 RBP: 00007f086c813f91 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f086c9e6038 R14: 00007f086c9e5fa0 R15: 00007ffc2148b088