watchdog: BUG: soft lockup - CPU#0 stuck for 116s! [kworker/0:0:9] Modules linked in: irq event stamp: 211193 hardirqs last enabled at (211192): [] queue_work_on+0x117/0x1d0 kernel/workqueue.c:2505 hardirqs last disabled at (211193): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (211170): [] wg_socket_send_skb_to_peer+0x16b/0x1d0 drivers/net/wireguard/socket.c:183 softirqs last disabled at (211171): [] do_softirq+0x77/0xd0 kernel/softirq.c:546 CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Workqueue: wg-crypt-wg0 wg_packet_tx_worker RIP: 0010:queue_work_on+0x162/0x1d0 kernel/workqueue.c:2506 Code: 00 4d 85 ed 75 16 e8 bd b5 39 00 eb 15 e8 b6 b5 39 00 e8 e1 cb 58 0a 4d 85 ed 74 ea e8 a7 b5 39 00 fb 65 48 8b 05 76 36 07 12 <48> 3b 44 24 18 75 56 89 d8 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc900000075c8 EFLAGS: 00000246 RAX: d703c1b010d5f400 RBX: ffffe8ffffc6d901 RCX: ffff88801def5dc0 RDX: 8000000000000300 RSI: 0000000000000100 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000100 R09: 1ffffffff20f4c4f R10: dffffc0000000000 R11: fffffbfff20f4c50 R12: 0000000000000000 R13: 0000000000000200 R14: 0000000000000000 R15: 0000000000800001 FS: 0000000000000000(0000) GS:ffff888124cc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000f000 CR3: 000000005b7e2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:171 [inline] wg_packet_consume_data drivers/net/wireguard/receive.c:526 [inline] wg_packet_receive+0x1763/0x2350 drivers/net/wireguard/receive.c:576 wg_receive+0x75/0xa0 drivers/net/wireguard/socket.c:325 udpv6_queue_rcv_one_skb+0x1022/0x1140 net/ipv6/udp.c:855 udp6_unicast_rcv_skb+0x1ec/0x330 net/ipv6/udp.c:1042 ip6_protocol_deliver_rcu+0xd6e/0x1680 net/ipv6/ip6_input.c:479 ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:534 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:545 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325 __netif_receive_skb_one_core net/core/dev.c:6297 [inline] __netif_receive_skb net/core/dev.c:6410 [inline] process_backlog+0x795/0x18b0 net/core/dev.c:6761 __napi_poll+0xaa/0x330 net/core/dev.c:7830 napi_poll net/core/dev.c:7893 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8050 handle_softirqs+0x226/0x860 kernel/softirq.c:645 do_softirq+0x77/0xd0 kernel/softirq.c:546 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473 wg_socket_send_skb_to_peer+0x16b/0x1d0 drivers/net/wireguard/socket.c:183 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1c8/0x7e0 drivers/net/wireguard/send.c:276 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 15735 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:native_pause arch/x86/include/asm/vdso/processor.h:13 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline] RIP: 0010:csd_lock kernel/smp.c:396 [inline] RIP: 0010:smp_call_function_many_cond+0x61c/0x1500 kernel/smp.c:944 Code: 41 0f b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 01 59 0c 00 41 83 e7 01 75 07 e8 f6 53 0c 00 eb 3f 90 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 RSP: 0018:ffffc90003fc7320 EFLAGS: 00000293 RAX: ffffffff81bbbb7e RBX: ffff8880b8643708 RCX: ffff8880341f5dc0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003fc7470 R08: ffff8880341f735f R09: 1ffff1100683ee6b R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110170c86e1 R13: 0000000000000000 R14: ffff8880b8643700 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124dc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f12189f34b8 CR3: 000000007a3a4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x8ff/0x1090 arch/x86/mm/tlb.c:1435 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline] tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:423 tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:549 free_ldt_pgtables+0x192/0x360 arch/x86/kernel/ldt.c:411 arch_exit_mmap arch/x86/include/asm/mmu_context.h:229 [inline] exit_mmap+0x1bf/0x9f0 mm/mmap.c:1300 __mmput+0x118/0x420 kernel/fork.c:1193 exit_mm+0x18e/0x240 kernel/exit.c:592 do_exit+0x6cd/0x2360 kernel/exit.c:974 do_group_exit+0x22d/0x2f0 kernel/exit.c:1129 get_signal+0x121b/0x12c0 kernel/signal.c:3112 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9fc5359317 Code: Unable to access opcode bytes at 0x7f9fc53592ed. RSP: 002b:00007ffc9282f8f0 EFLAGS: 00000202 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000555581776500 RCX: 00007f9fc5359317 RDX: 0000000040000000 RSI: 00007ffc9282f94c RDI: ffffffffffffffff RBP: 00007ffc9282f94c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 R13: 0000000000000003 R14: 00007ffc9282fba8 R15: 0000000000000000