watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.1.2686:15874] Modules linked in: irq event stamp: 4501197 hardirqs last enabled at (4501196): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (4501197): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (3076): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (3076): [] rcu_read_lock_bh include/linux/rcupdate.h:918 [inline] softirqs last enabled at (3076): [] __dev_queue_xmit+0x289/0x3140 net/core/dev.c:4742 softirqs last disabled at (3329): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (3329): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (3329): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 15874 Comm: syz.1.2686 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:NF_HOOK_COND include/linux/netfilter.h:-1 [inline] RIP: 0010:ip6_output+0x343/0x550 net/ipv6/ip6_output.c:247 Code: e8 32 2f cb f7 41 83 fe 01 75 21 e8 e7 2a cb f7 eb 05 e8 e0 2a cb f7 4c 89 ff 48 8b 74 24 08 48 89 da e8 b0 03 00 00 41 89 c6 05 e8 c6 2a cb f7 e8 61 28 53 01 89 c3 31 ff 89 c6 e8 f6 2e cb RSP: 0018:ffffc90000a08888 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888031389000 RCX: b127b9fe9f85b600 RDX: 0000000000000002 RSI: ffffffff8d76bea1 RDI: ffffffff8bbfc660 RBP: 0000000000000000 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: ffffffff89f61d76 R13: ffff88806d634000 R14: 0000000000000000 R15: ffff88802ee625c0 FS: 00007f0ddfc4e6c0(0000) GS:ffff8881261b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 000000005f424000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbce/0x1510 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 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:generic_exec_single+0x481/0x500 kernel/smp.c:453 Code: 75 11 e8 02 a0 0b 00 48 85 db 75 16 e8 f8 9f 0b 00 eb 15 e8 f1 9f 0b 00 e8 3c 97 93 09 48 85 db 74 ea e8 e2 9f 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c RSP: 0018:ffffc900158a79e0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000 RDX: ffffc9001ce53000 RSI: 00000000000010bd RDI: 00000000000010be RBP: ffffc900158a7ab0 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: 1ffff92002b14f40 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92002b14f61 smp_call_function_single+0x351/0x590 kernel/smp.c:684 task_function_call kernel/events/core.c:122 [inline] perf_install_in_context+0x593/0x8f0 kernel/events/core.c:3108 __do_sys_perf_event_open kernel/events/core.c:13816 [inline] __se_sys_perf_event_open+0x1966/0x1d90 kernel/events/core.c:13458 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: 0033:0x7f0dded8f749 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:00007f0ddfc4e038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f0ddefe5fa0 RCX: 00007f0dded8f749 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0 RBP: 00007f0ddee13f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0ddefe6038 R14: 00007f0ddefe5fa0 R15: 00007ffedd80e2f8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 4480 Comm: kworker/u8:14 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker RIP: 0010:__find_rr_leaf+0x32c/0x6d0 net/ipv6/route.c:833 Code: 00 00 00 00 00 fc ff df 4c 8b 7c 24 30 49 83 c6 08 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 b7 af 29 f8 4d 8b 36 0f be 4b 01 89 c3 31 ff 89 c6 e8 a4 c4 c3 f7 85 db 74 1b e8 7b RSP: 0018:ffffc90000007240 EFLAGS: 00000246 RAX: 1ffff1100ac09581 RBX: 0000000000000001 RCX: ffff88803278db80 RDX: 0000000000000100 RSI: 00000000fffffffd RDI: 00000000fffffffd RBP: ffffc90000007398 R08: ffffc900000074c0 R09: ffffc900000074d0 R10: ffffc90000007320 R11: fffff52000000e66 R12: 1ffff1100ac0958c R13: dffffc0000000000 R14: ffff88803025f400 R15: ffffc90000007498 FS: 0000000000000000(0000) GS:ffff8881260b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555b4455c8 CR3: 000000000dd3a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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+0xec/0x180 kernel/softirq.c:523 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline] kernel_fpu_end+0xd2/0x120 arch/x86/kernel/fpu/core.c:480 blake2s_compress+0xe9/0x1b80 lib/crypto/x86/blake2s.h:42 blake2s_update+0x14b/0x450 lib/crypto/blake2s.c:125 hmac+0x1b6/0x330 drivers/net/wireguard/noise.c:324 kdf+0x182/0x270 drivers/net/wireguard/noise.c:375 mix_dh drivers/net/wireguard/noise.c:413 [inline] wg_noise_handshake_create_initiation+0x278/0x750 drivers/net/wireguard/noise.c:550 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:34 [inline] wg_packet_handshake_send_worker+0x163/0x320 drivers/net/wireguard/send.c:51 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246