watchdog: BUG: soft lockup - CPU#1 stuck for 21s! [kworker/u4:0:9]
Modules linked in:
irq event stamp: 476983
hardirqs last  enabled at (476982): [<ffff8000111a1ed8>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:81 [inline]
hardirqs last  enabled at (476982): [<ffff8000111a1ed8>] exit_to_kernel_mode+0xe0/0x168 arch/arm64/kernel/entry-common.c:91
hardirqs last disabled at (476983): [<ffff8000111a2130>] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227
softirqs last  enabled at (472582): [<ffff80000c41b254>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (472590): [<ffff80000c425d48>] wg_socket_send_skb_to_peer+0x60/0x1a4 drivers/net/wireguard/socket.c:173
CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 5.15.181-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __sanitizer_cov_trace_pc+0xa0/0xac kernel/kcov.c:216
lr : fq_flow_add_tail net/sched/sch_fq.c:167 [inline]
lr : fq_dequeue+0xa2c/0x1978 net/sched/sch_fq.c:564
sp : ffff80001b2b6f90
x29: ffff80001b2b70e0 x28: ffff0000eb88b2e8 x27: 1fffe00018291a39
x26: ffff0000eb88b000 x25: ffff0000c148d180 x24: 00000000f765a32c
x23: ffff0000c148d1c8 x22: ffff0000eb88b2d0 x21: 0000000000000008
x20: 0000000000000010 x19: dfff800000000000 x18: 0000000000000802
x17: 0000000000000000 x16: ffff8000082bf2a4 x15: 0000000000000001
x14: 0000000000ff0100 x13: 1ffff0000282a06b x12: 0000000000ff0100
x11: 0000000000000802 x10: 0000000000000000 x9 : ffff80000f9a1334
x8 : ffff0000c0950000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff800008044e7c
x2 : 0000000000000002 x1 : 00000000f765a32c x0 : 0000000000000001
Call trace:
 __sanitizer_cov_trace_pc+0xa0/0xac kernel/kcov.c:214
 dequeue_skb net/sched/sch_generic.c:292 [inline]
 qdisc_restart net/sched/sch_generic.c:397 [inline]
 __qdisc_run+0x1bc/0x1170 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3942 [inline]
 __dev_queue_xmit+0xfe0/0x2800 net/core/dev.c:4253
 dev_queue_xmit+0x24/0x34 net/core/dev.c:4321
 neigh_hh_output include/net/neighbour.h:493 [inline]
 neigh_output include/net/neighbour.h:507 [inline]
 ip_finish_output2+0xdac/0x1228 net/ipv4/ip_output.c:228
 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1
 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x314/0x414 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:452 [inline]
 ip_local_out+0x120/0x15c net/ipv4/ip_output.c:126
 iptunnel_xmit+0x3f8/0x8dc net/ipv4/ip_tunnel_core.c:82
 udp_tunnel_xmit_skb+0x168/0x250 net/ipv4/udp_tunnel_core.c:175
 send4+0x7f4/0xbc4 drivers/net/wireguard/socket.c:85
 wg_socket_send_skb_to_peer+0xc4/0x1a4 drivers/net/wireguard/socket.c:175
 wg_socket_send_buffer_to_peer+0xec/0x144 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x1a4/0x2a0 drivers/net/wireguard/send.c:51
 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310
 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457
 kthread+0x374/0x454 kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870