watchdog: BUG: soft lockup - CPU#1 stuck for 25s! [kworker/u8:0:12] Modules linked in: irq event stamp: 3179579 hardirqs last enabled at (3179578): [] __local_bh_enable_ip+0x1ec/0x35c kernel/softirq.c:478 hardirqs last disabled at (3179579): [] seqcount_lockdep_reader_access+0x40/0xf8 include/linux/seqlock.h:72 softirqs last enabled at (3179570): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (3179572): [] wg_socket_send_skb_to_peer+0x5c/0x19c drivers/net/wireguard/socket.c:172 CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : seqcount_lockdep_reader_access+0xd8/0xf8 include/linux/seqlock.h:76 lr : seqcount_lockdep_reader_access+0xd4/0xf8 include/linux/seqlock.h:75 sp : ffff80008ed67090 x29: ffff80008ed67090 x28: ffff80008ed67320 x27: dfff800000000000 x26: ffff0000f099f2c8 x25: dfff800000000000 x24: ffff80008ed6723a x23: 000000001ca1b959 x22: ffffffffffffffe8 x21: 0000000000000000 x20: ffff8000853ab094 x19: 00000000000000c0 x18: 00000000bee4c219 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000003 x11: ffff80008015610c x10: ffff8000886f7ac5 x9 : 0000000000000400 x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff80008048e314 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000853aadb4 x2 : 0000000000000080 x1 : ffff0000c19f8000 x0 : 0000000000000000 dump_backtrace(regs = 000000005a07dfb6 tsk = 0000000000000000) Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) seqcount_lockdep_reader_access+0xd8/0xf8 include/linux/seqlock.h:75 (P) ip_vs_conn_out_get+0x2b4/0xdf0 net/netfilter/ipvs/ip_vs_conn.c:561 ip_vs_conn_out_get_proto+0xec/0x14c net/netfilter/ipvs/ip_vs_conn.c:613 ip_vs_out_hook+0x4a8/0xc3c net/netfilter/ipvs/ip_vs_core.c:1578 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline] nf_hook_slow+0xc8/0x224 net/netfilter/core.c:619 nf_hook+0x1f0/0x364 include/linux/netfilter.h:280 __ip_local_out+0x54c/0x660 net/ipv4/ip_output.c:120 ip_local_out+0x3c/0x148 net/ipv4/ip_output.c:129 iptunnel_xmit+0x590/0xdf0 net/ipv4/ip_tunnel_core.c:97 udp_tunnel_xmit_skb+0x220/0x348 net/ipv4/udp_tunnel_core.c:187 send4+0x8cc/0xcf4 drivers/net/wireguard/socket.c:85 wg_socket_send_skb_to_peer+0xc0/0x19c drivers/net/wireguard/socket.c:174 wg_socket_send_buffer_to_peer+0x108/0x174 drivers/net/wireguard/socket.c:199 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x1c0/0x2d8 drivers/net/wireguard/send.c:51 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3194 Comm: kworker/u8:9 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Workqueue: events_unbound toggle_allocation_gate pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:363 [inline] pc : smp_call_function_many_cond+0xfec/0x1590 kernel/smp.c:1002 lr : csd_lock_wait kernel/smp.c:363 [inline] lr : smp_call_function_many_cond+0x1004/0x1590 kernel/smp.c:1002 sp : ffff800099bb77e0 x29: ffff800099bb7920 x28: ffff800088bfa960 x27: 0000000000000011 x26: dfff800000000000 x25: 0000000000000001 x24: ffffffffffffffff x23: ffff800088bfa960 x22: 1fffe00035ba1a78 x21: ffff0001add37aa8 x20: ffff0000cf46b2b8 x19: ffff0001add0d3c0 x18: 1fffe00035b9ec28 x17: 0000000000000003 x16: ffff800088bf7000 x15: ffff800088ca7ee0 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600035ba6f56 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : ffff800080169dfc x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000805bafd8 x2 : 0000000000000000 x1 : ffff0000cf469d80 x0 : 0000000000000000 dump_backtrace(regs = 0000000022e5fbbb tsk = 0000000000000000) Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) csd_lock_wait kernel/smp.c:363 [inline] (P) smp_call_function_many_cond+0xfec/0x1590 kernel/smp.c:1002 (P) smp_call_function kernel/smp.c:1043 [inline] kick_all_cpus_sync+0x34/0x40 kernel/smp.c:1192 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34 __jump_label_update+0x31c/0x344 kernel/jump_label.c:521 jump_label_update+0x428/0x4b8 kernel/jump_label.c:910 static_key_enable_cpuslocked+0x11c/0x220 kernel/jump_label.c:210 static_key_enable+0x24/0x38 kernel/jump_label.c:223 toggle_allocation_gate+0xb8/0x28c mm/kfence/core.c:902 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470 worker_thread+0x798/0xbd0 kernel/workqueue.c:3551 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 virtqueue callback for 00000000dcc12b9e (000000005d9a25e1) wireguard: wg2: Handshake for peer 41 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 2) wireguard: wg2: Handshake for peer 17 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 10) geneve1: no route to fc00:0000:0000:0000:0000:0000:0000:0001 wireguard: wg1: Handshake for peer 15 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 13) wireguard: wg1: Handshake for peer 40 (127.0.0.1:20003) did not complete after 5 seconds, retrying (try 11) dlc 000000002de6b54d state 8 kobject: 'brport' (00000000f2e5b71a): kobject_cleanup, parent 0000000000000000 kobject: 'brport' (00000000f2e5b71a): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000006400e2e4): kobject_cleanup, parent 0000000000000000 kobject: 'brport' (000000006400e2e4): calling ktype release kobject: 'brport': free name net_ratelimit: 35 callbacks suppressed wireguard: wg0: Sending keepalive packet to peer 61 (127.0.0.1:20002)