watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:5:6543] Modules linked in: irq event stamp: 60929947 hardirqs last enabled at (60929946): [] get_random_u16+0x2d4/0x540 drivers/char/random.c:552 hardirqs last disabled at (60929947): [] __el1_irq arch/arm64/kernel/entry-common.c:580 [inline] hardirqs last disabled at (60929947): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:598 softirqs last enabled at (41806704): [] wg_socket_send_skb_to_peer+0x154/0x1a4 drivers/net/wireguard/socket.c:184 softirqs last disabled at (41806705): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 CPU: 0 UID: 0 PID: 6543 Comm: kworker/0:5 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: wg-crypt-wg0 wg_packet_tx_worker pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : preempt_count arch/arm64/include/asm/preempt.h:13 [inline] pc : check_kcov_mode kernel/kcov.c:183 [inline] pc : __sanitizer_cov_trace_pc+0x14/0x84 kernel/kcov.c:217 lr : get_random_u16+0x88/0x540 drivers/char/random.c:552 sp : ffff800080006510 x29: ffff800080006600 x28: 00000000000198d0 x27: dfff800000000000 x26: 0000004033966518 x25: ffff700010000ca8 x24: 0000000000000000 x23: dfff800000000000 x22: 0000000000000006 x21: ffff800080006540 x20: 0000000000000001 x19: ffff800080006560 x18: 0000000018984413 x17: dfff800000000000 x16: ffff80008051cacc x15: 0000000000000008 x14: 1ffff00010000c80 x13: 0000000000000000 x12: 0000000000000000 x11: ffff0000e44010a0 x10: ffff80008ebcafd7 x9 : 0000000000000502 x8 : ffff0000c3da3d00 x7 : ffff800083df5028 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000007 x1 : 0000000000000001 x0 : 0000000000000401 Call trace: preempt_count arch/arm64/include/asm/preempt.h:13 [inline] (P) check_kcov_mode kernel/kcov.c:183 [inline] (P) __sanitizer_cov_trace_pc+0x14/0x84 kernel/kcov.c:217 (P) cake_get_flow_quantum+0x178/0x288 net/sched/sch_cake.c:687 cake_dequeue+0x20cc/0x3bf0 net/sched/sch_cake.c:2106 dequeue_skb net/sched/sch_generic.c:293 [inline] qdisc_restart net/sched/sch_generic.c:398 [inline] __qdisc_run+0x1c4/0x1300 net/sched/sch_generic.c:416 __dev_xmit_skb net/core/dev.c:4087 [inline] __dev_queue_xmit+0xc7c/0x31f0 net/core/dev.c:4595 dev_queue_xmit include/linux/netdevice.h:3350 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0xd80/0x1240 net/ipv4/ip_output.c:235 __ip_finish_output+0x1b0/0x44c net/ipv4/ip_output.c:-1 ip_finish_output+0x44/0x304 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x194/0x20c net/ipv4/ip_output.c:433 dst_output include/net/dst.h:459 [inline] ip_local_out+0x120/0x15c net/ipv4/ip_output.c:129 iptunnel_xmit+0x438/0x950 net/ipv4/ip_tunnel_core.c:82 udp_tunnel_xmit_skb+0x1c8/0x2e8 net/ipv4/udp_tunnel_core.c:173 geneve_xmit_skb drivers/net/geneve.c:921 [inline] geneve_xmit+0x1f70/0x2afc drivers/net/geneve.c:1046 __netdev_start_xmit include/linux/netdevice.h:5204 [inline] netdev_start_xmit include/linux/netdevice.h:5213 [inline] xmit_one net/core/dev.c:3776 [inline] dev_hard_start_xmit+0x2b0/0x8ac net/core/dev.c:3792 __dev_queue_xmit+0x15a4/0x31f0 net/core/dev.c:4629 dev_queue_xmit include/linux/netdevice.h:3350 [inline] neigh_resolve_output+0x550/0x654 net/core/neighbour.c:1512 neigh_output include/net/neighbour.h:539 [inline] ip6_finish_output2+0x1544/0x1c7c net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x418/0x7b4 net/ipv6/ip6_output.c:226 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip6_output+0x274/0x504 net/ipv6/ip6_output.c:247 dst_output include/net/dst.h:459 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] ndisc_send_skb+0xb48/0x1524 net/ipv6/ndisc.c:513 ndisc_send_rs+0x378/0x514 net/ipv6/ndisc.c:723 addrconf_rs_timer+0x2f4/0x580 net/ipv6/addrconf.c:4041 call_timer_fn+0x1b4/0x818 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x51c/0x76c kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xcc/0x194 kernel/time/timer.c:2445 handle_softirqs+0x328/0xc88 kernel/softirq.c:579 __do_softirq+0x14/0x20 kernel/softirq.c:613 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x30 arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 do_softirq+0x90/0xf8 kernel/softirq.c:480 __local_bh_enable_ip+0x240/0x35c kernel/softirq.c:407 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline] _raw_read_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:284 wg_socket_send_skb_to_peer+0x154/0x1a4 drivers/net/wireguard/socket.c:184 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x19c/0x6c8 drivers/net/wireguard/send.c:276 process_one_work+0x7e8/0x156c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 26 Comm: kworker/1:1 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: wg-crypt-wg0 wg_packet_tx_worker pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197 lr : queued_spin_lock_slowpath+0x144/0xaec kernel/locking/qspinlock.c:197 sp : ffff8000977470c0 x29: ffff800097747160 x28: 1fffe0001f6df01f x27: 1fffe000183737a2 x26: ffff0000c1b9bd00 x25: dfff800000000000 x24: ffff700012ee8e1c x23: 0000000000000000 x22: ffff0000c1b9bd10 x21: ffff0000fb6f80f8 x20: ffff0000fb6f8100 x19: ffff0000fb6f80f0 x18: 1fffe0003386f276 x17: ffff80008f31e000 x16: ffff800080528c04 x15: 0000000000000001 x14: 1fffe0001f6df01e x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001f6df01f x10: dfff800000000000 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff8000890c7180 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008ade0748 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P) queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197 (P) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2a8/0x2cc kernel/locking/spinlock_debug.c:116 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline] _raw_spin_lock+0x50/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __dev_xmit_skb net/core/dev.c:4054 [inline] __dev_queue_xmit+0xa50/0x31f0 net/core/dev.c:4595 dev_queue_xmit include/linux/netdevice.h:3350 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip6_finish_output2+0x1510/0x1c7c net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x418/0x7b4 net/ipv6/ip6_output.c:226 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip6_output+0x274/0x504 net/ipv6/ip6_output.c:247 dst_output include/net/dst.h:459 [inline] ip6_local_out+0x120/0x15c net/ipv6/output_core.c:155 ip6tunnel_xmit include/net/ip6_tunnel.h:161 [inline] udp_tunnel6_xmit_skb+0x4b0/0x9d0 net/ipv6/ip6_udp_tunnel.c:111 send6+0x4e8/0x774 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer+0xf8/0x1a4 drivers/net/wireguard/socket.c:178 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x19c/0x6c8 drivers/net/wireguard/send.c:276 process_one_work+0x7e8/0x156c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847