watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [kworker/u4:11:23858] Modules linked in: CPU: 0 PID: 23858 Comm: kworker/u4:11 Not tainted 5.10.186-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker RIP: 0010:pv_wait_node kernel/locking/qspinlock_paravirt.h:301 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x36e/0xc70 kernel/locking/qspinlock.c:473 Code: 80 00 00 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 06 84 c0 0f 85 b0 00 00 00 41 83 3f 00 0f 85 fb 00 00 00 84 db 74 08 f3 90 cb 75 d5 eb 24 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 28 0f RSP: 0018:ffffc900088df1a0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000001a51 RCX: 1ffff1103ee2ae4a RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881f7057254 RBP: ffffc900088df290 R08: dffffc0000000000 R09: ffffed103ee0ae4b R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881189e08ac R13: 1ffff1102313c115 R14: 1ffff1103ee0ae49 R15: ffff8881f7057248 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff2f410d00 CR3: 00000001579c6000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock include/linux/spinlock.h:183 [inline] __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x139/0x1b0 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] __dev_xmit_skb net/core/dev.c:3808 [inline] __dev_queue_xmit+0xbc0/0x28e0 net/core/dev.c:4147 dev_queue_xmit+0x17/0x20 net/core/dev.c:4215 neigh_hh_output include/net/neighbour.h:501 [inline] neigh_output include/net/neighbour.h:515 [inline] ip_finish_output2+0xb1d/0xfc0 net/ipv4/ip_output.c:237 __ip_finish_output+0x409/0x740 ip_finish_output+0x34/0x1e0 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:288 [inline] ip_output+0x1d6/0x420 net/ipv4/ip_output.c:439 dst_output include/net/dst.h:437 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x470/0x850 net/ipv4/ip_tunnel_core.c:82 udp_tunnel_xmit_skb+0x1bd/0x2d0 net/ipv4/udp_tunnel_core.c:190 send4+0x615/0xce0 drivers/net/wireguard/socket.c:85 wg_socket_send_skb_to_peer+0xd5/0x1d0 drivers/net/wireguard/socket.c:175 wg_socket_send_buffer_to_peer+0x11a/0x170 drivers/net/wireguard/socket.c:200 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x1d4/0x240 drivers/net/wireguard/send.c:51 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2298 worker_thread+0xaea/0x1510 kernel/workqueue.c:2444 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 25741 Comm: syz-executor.2 Not tainted 5.10.186-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x5a1/0xc70 kernel/locking/qspinlock.c:508 Code: 85 ba 01 00 00 c6 03 00 48 8b 44 24 28 42 0f b6 04 30 84 c0 0f 85 bf 01 00 00 48 8b 04 24 c6 00 01 bb 00 80 ff ff eb 06 f3 90 c3 74 50 43 0f b6 44 35 00 84 c0 75 32 41 80 3c 24 00 75 e9 4c RSP: 0018:ffffc9000858ebc0 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 00000000ffff87e3 RCX: ffffffff8150a3c4 RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffffc9000858eb40 RBP: ffffc9000858ecb0 R08: dffffc0000000000 R09: ffffed102313c116 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881189e08ac R13: 1ffff1102313c115 R14: dffffc0000000000 R15: ffff88823ff52500 FS: 00007f7d1f94a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020013030 CR3: 0000000119dac000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock include/linux/spinlock.h:183 [inline] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x139/0x1b0 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] get_dist_table+0x207/0x2e0 net/sched/sch_netem.c:798 netem_change+0x974/0x1fb0 net/sched/sch_netem.c:988 netem_init+0x5b/0xb0 net/sched/sch_netem.c:1075 qdisc_create+0x879/0x12d0 net/sched/sch_api.c:1264 tc_modify_qdisc+0x8a4/0x13f0 rtnetlink_rcv_msg+0x955/0xc50 net/core/rtnetlink.c:5571 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2496 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5589 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1348 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1915 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2357 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2411 __sys_sendmsg net/socket.c:2440 [inline] __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2447 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2447 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f7d20bc7b29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7d1f94a0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7d20ce6f80 RCX: 00007f7d20bc7b29 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000005 RBP: 00007f7d20c1347a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f7d20ce6f80 R15: 00007ffe457a66d8