watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u4:1:136] Modules linked in: irq event stamp: 2911161 hardirqs last enabled at (2911160): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:81 [inline] hardirqs last enabled at (2911160): [] exit_to_kernel_mode+0x100/0x178 arch/arm64/kernel/entry-common.c:91 hardirqs last disabled at (2911161): [] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227 softirqs last enabled at (2906600): [] spin_unlock_bh include/linux/spinlock.h:408 [inline] softirqs last enabled at (2906600): [] __batadv_dat_purge+0x2d4/0x374 net/batman-adv/distributed-arp-table.c:187 softirqs last disabled at (2906605): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (2906605): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (2906605): [] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:636 CPU: 0 PID: 136 Comm: kworker/u4:1 Not tainted 5.15.116-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: bat_events batadv_dat_purge pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : fq_pie_qdisc_dequeue+0x10c/0x874 net/sched/sch_fq_pie.c:246 lr : fq_pie_qdisc_dequeue+0xe4/0x874 net/sched/sch_fq_pie.c:240 sp : ffff800008007130 x29: ffff8000080071a0 x28: ffff00011588c6f0 x27: 1fffe00022b118dc x26: dfff800000000000 x25: ffff0000c8d902e8 x24: ffff0000c8d902f0 x23: ffff00011588c6e0 x22: ffff0000c8d902e0 x21: ffff0000c8d902e0 x20: ffff0000c8d902e0 x19: ffff0000c8d902e0 x18: 0000000000000502 x17: ff8080000ff527ac x16: 0000000000000000 x15: ffff80000ff527ac x14: 0000000000000001 x13: ffffffffffffffff x12: 0000000000000100 x11: ff80800010098adc x10: 0000000000000000 x9 : ffff800010098adc x8 : 0000000000000000 x7 : ffff80000fd8c024 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000c8d902e0 x1 : ffff0000c8d902e0 x0 : 0000000000000001 Call trace: fq_pie_qdisc_dequeue+0x10c/0x874 net/sched/sch_fq_pie.c:246 dequeue_skb net/sched/sch_generic.c:292 [inline] qdisc_restart net/sched/sch_generic.c:397 [inline] __qdisc_run+0x1ec/0x1fc0 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3879 [inline] __dev_queue_xmit+0x1068/0x2a6c net/core/dev.c:4190 dev_queue_xmit+0x24/0x34 net/core/dev.c:4258 neigh_connected_output+0x334/0x378 net/core/neighbour.c:1553 neigh_output include/net/neighbour.h:516 [inline] ip6_finish_output2+0x1344/0x1c48 net/ipv6/ip6_output.c:126 __ip6_finish_output+0x518/0x67c net/ipv6/ip6_output.c:191 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:201 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x270/0x594 net/ipv6/ip6_output.c:224 dst_output include/net/dst.h:449 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0xbf8/0x1788 net/ipv6/ndisc.c:508 ndisc_send_rs+0x494/0x5fc net/ipv6/ndisc.c:702 addrconf_rs_timer+0x308/0x5a8 net/ipv6/addrconf.c:3932 call_timer_fn+0x19c/0x8f0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x554/0x718 kernel/time/timer.c:1737 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1750 __do_softirq+0x344/0xe20 kernel/softirq.c:558 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:439 [inline] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:636 irq_exit+0x14/0x88 kernel/softirq.c:660 handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:757 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:442 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:458 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline] finish_lock_switch+0xc4/0x1e8 kernel/sched/core.c:4780 finish_task_switch+0x120/0x6b4 kernel/sched/core.c:4898 context_switch kernel/sched/core.c:5029 [inline] __schedule+0xf14/0x1e38 kernel/sched/core.c:6372 preempt_schedule_common+0x140/0x260 kernel/sched/core.c:6548 preempt_schedule+0x64/0x84 kernel/sched/core.c:6573 __local_bh_enable_ip+0x27c/0x4d0 kernel/softirq.c:390 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0xf8/0x180 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:408 [inline] __batadv_dat_purge+0x2d4/0x374 net/batman-adv/distributed-arp-table.c:187 batadv_dat_purge+0x34/0x154 net/batman-adv/distributed-arp-table.c:206 process_one_work+0x790/0x11b8 kernel/workqueue.c:2307 worker_thread+0x910/0x1034 kernel/workqueue.c:2454 kthread+0x37c/0x45c kernel/kthread.c:319 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870