RBP: 00007f83d0af606b R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83d0ce7128 R14: 00007f83d0ce7090 R15: 00007ffc53053f58
watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.1.20687:19971]
Modules linked in:
CPU: 0 PID: 19971 Comm: syz.1.20687 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:update_stack_state+0x24/0x490 arch/x86/kernel/unwind_frame.c:200
Code: 1f 80 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 81 ec 88 00 00 00 49 89 f6 49 89 fc 49 bd 00 00 00 00 00 fc ff df <48> 89 f8 48 c1 e8 03 48 89 45 c8 42 0f b6 04 28 84 c0 0f 85 0f 04
RSP: 0018:ffffc90000007688 EFLAGS: 00000296
RAX: 1ffff92000000faf RBX: ffffc900000077a8 RCX: ffffc90000007db0
RDX: dffffc0000000000 RSI: ffffc90000007db0 RDI: ffffc900000077a8
RBP: ffffc90000007738 R08: ffffc90000007870 R09: ffffc90000007868
R10: 000000000000000a R11: fffff52000000f01 R12: ffffc900000077a8
R13: dffffc0000000000 R14: ffffc90000007db0 R15: 0000000000000000
FS:  00007f83cf4976c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f83cf3f1ff8 CR3: 00000001324f1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x39e/0x670 arch/x86/kernel/unwind_frame.c:316
 arch_stack_walk+0x108/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:121
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kmem_cache_free+0x100/0x2d0 mm/slub.c:3224
 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1
 __kfree_skb net/core/skbuff.c:695 [inline]
 kfree_skb+0xc1/0x2f0 net/core/skbuff.c:713
 __skb_queue_purge include/linux/skbuff.h:2906 [inline]
 neigh_invalidate+0x409/0x4d0 net/core/neighbour.c:1005
 neigh_timer_handler+0x86f/0xe80 net/core/neighbour.c:1089
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450
 expire_timers kernel/time/timer.c:1495 [inline]
 __run_timers+0x637/0x9a0 kernel/time/timer.c:1789
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1802
 __do_softirq+0x255/0x563 kernel/softirq.c:309
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:405 [inline]
 __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447
 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
RIP: 0010:generic_exec_single+0x152/0x370 kernel/smp.c:296
Code: c7 44 24 40 00 00 00 00 9c 8f 44 24 40 48 8b 5c 24 40 43 c6 44 3d 04 f8 fa 4c 89 f7 ff 54 24 10 48 89 5c 24 18 ff 74 24 18 9d <31> c0 e9 38 01 00 00 44 8b 3d e0 4c 69 05 44 89 f7 44 89 fe e8 25
RSP: 0018:ffffc900018d7a60 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000246 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: ffffc900018d7b10 R08: ffffc900018d6c97 R09: ffffc900018d6c80
R10: dffffc0000000000 R11: fffff5200031ad93 R12: ffffc900018d7b68
R13: 1ffff9200031af50 R14: ffffc900018d7ca0 R15: dffffc0000000000
 smp_call_function_single+0x1d9/0x490 kernel/smp.c:514
 task_function_call kernel/events/core.c:116 [inline]
 perf_install_in_context+0x4c7/0x770 kernel/events/core.c:2969
 __do_sys_perf_event_open kernel/events/core.c:12286 [inline]
 __se_sys_perf_event_open+0x1246/0x1b40 kernel/events/core.c:11878
 __x64_sys_perf_event_open+0xbf/0xd0 kernel/events/core.c:11878
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f83d0a5f159
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:00007f83cf497028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f83d0ce7090 RCX: 00007f83d0a5f159
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007f83d0af606b R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83d0ce7128 R14: 00007f83d0ce7090 R15: 00007ffc53053f58
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
RIP: 0010:queued_write_lock_slowpath+0x137/0x240 kernel/locking/qrwlock.c:79
Code: 53 00 f0 81 03 00 01 00 00 43 0f b6 04 26 84 c0 74 35 89 d9 80 e1 07 80 c1 03 38 c1 7c 29 48 89 df e8 8d 08 53 00 eb 1f f3 90 <43> 0f b6 04 26 84 c0 74 14 89 d9 80 e1 07 80 c1 03 38 c1 7c 08 48
RSP: 0018:ffffc90000077240 EFLAGS: 00000206
RAX: 00000000000001ff RBX: ffff8881279d0028 RCX: ffffffff814c2caf
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8881279d0028
RBP: ffffc900000772d0 R08: ffff8881279d002b R09: 1ffff11024f3a005
R10: dffffc0000000000 R11: ffffed1024f3a006 R12: dffffc0000000000
R13: 1ffff9200000ee48 R14: 1ffff11024f3a005 R15: ffff8881279d002c
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa1d82c000 CR3: 000000000640f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 queued_write_lock include/asm-generic/qrwlock.h:95 [inline]
 __raw_write_lock_bh include/linux/rwlock_api_smp.h:204 [inline]
 _raw_write_lock_bh+0xe2/0xf0 kernel/locking/spinlock.c:319
 __neigh_event_send+0x34/0x1100 net/core/neighbour.c:1119
 neigh_event_send include/net/neighbour.h:446 [inline]
 neigh_resolve_output+0x1e1/0x770 net/core/neighbour.c:1489
 neigh_output include/net/neighbour.h:517 [inline]
 ip6_finish_output2+0xee2/0x1540 net/ipv6/ip6_output.c:132
 __ip6_finish_output+0x5fd/0x790 net/ipv6/ip6_output.c:203
 ip6_finish_output+0x33/0x1e0 net/ipv6/ip6_output.c:213
 NF_HOOK_COND include/linux/netfilter.h:288 [inline]
 ip6_output+0x1fa/0x420 net/ipv6/ip6_output.c:236
 dst_output include/net/dst.h:451 [inline]
 ip6_local_out+0x200/0x3c0 net/ipv6/output_core.c:161
 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline]
 udp_tunnel6_xmit_skb+0x3eb/0x7c0 net/ipv6/ip6_udp_tunnel.c:110
 send6+0x4a3/0x6a0 drivers/net/wireguard/socket.c:152
 wg_socket_send_skb_to_peer+0x114/0x1d0 drivers/net/wireguard/socket.c:178
 wg_socket_send_buffer_to_peer+0x118/0x170 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x200/0x290 drivers/net/wireguard/send.c:51
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298