watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.1:6826] Modules linked in: irq event stamp: 87707 hardirqs last enabled at (87706): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (87706): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (87707): [] __el1_irq arch/arm64/kernel/entry-common.c:470 [inline] hardirqs last disabled at (87707): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:488 softirqs last enabled at (77852): [] softirq_handle_end kernel/softirq.c:414 [inline] softirqs last enabled at (77852): [] __do_softirq+0xac0/0xd54 kernel/softirq.c:600 softirqs last disabled at (83317): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 CPU: 1 PID: 6826 Comm: syz-executor.1 Not tainted 6.4.0-rc5-syzkaller-g177239177378 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __list_add_valid+0x94/0x110 lib/list_debug.c:39 lr : __list_add include/linux/list.h:69 [inline] lr : list_add_tail include/linux/list.h:102 [inline] lr : list_move_tail include/linux/list.h:230 [inline] lr : fq_pie_qdisc_dequeue+0x3cc/0x8ac net/sched/sch_fq_pie.c:248 sp : ffff8000800171d0 x29: ffff8000800171d0 x28: ffff000129e15280 x27: ffff0000da9902e8 x26: ffff0000da9902f0 x25: dfff800000000000 x24: ffff0000da9902e0 x23: dfff800000000000 x22: 0000000000000040 x21: ffff0000da9902e0 x20: ffff0000da9902e8 x19: ffff0000da9902e0 x18: ffff800080016e40 x17: 0000000000000000 x16: ffff80008050c16c x15: 0000000000000302 x14: 0000000000000100 x13: 0000000000000000 x12: 0000000000000001 x11: 0000000000000302 x10: 0000000000000100 x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff80008041c668 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000da9902e0 x1 : ffff0000da9902e0 x0 : 0000000000000001 Call trace: __list_add_valid+0x94/0x110 lib/list_debug.c:39 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] list_move_tail include/linux/list.h:230 [inline] fq_pie_qdisc_dequeue+0x3cc/0x8ac net/sched/sch_fq_pie.c:248 dequeue_skb net/sched/sch_generic.c:292 [inline] qdisc_restart net/sched/sch_generic.c:397 [inline] __qdisc_run+0x1fc/0x231c net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3868 [inline] __dev_queue_xmit+0xc80/0x3318 net/core/dev.c:4210 dev_queue_xmit include/linux/netdevice.h:3085 [inline] neigh_connected_output+0x2f8/0x38c net/core/neighbour.c:1581 neigh_output include/net/neighbour.h:544 [inline] ip6_finish_output2+0xd60/0x1a1c net/ipv6/ip6_output.c:134 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] ip6_finish_output+0x538/0x8c8 net/ipv6/ip6_output.c:206 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip6_output+0x270/0x594 net/ipv6/ip6_output.c:227 dst_output include/net/dst.h:458 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] ndisc_send_skb+0xc30/0x1790 net/ipv6/ndisc.c:508 ndisc_send_rs+0x47c/0x5d4 net/ipv6/ndisc.c:718 addrconf_rs_timer+0x300/0x58c net/ipv6/addrconf.c:3936 call_timer_fn+0x19c/0x8cc kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x55c/0x734 kernel/time/timer.c:2022 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2035 __do_softirq+0x2d0/0xd54 kernel/softirq.c:571 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:882 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:650 irq_exit_rcu+0x14/0x84 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:474 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:488 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:493 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:587 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:33 [inline] arch_local_irq_enable arch/arm64/include/asm/irqflags.h:55 [inline] raw_spin_rq_unlock_irq kernel/sched/sched.h:1378 [inline] finish_lock_switch+0xc0/0x1e4 kernel/sched/core.c:5095 finish_task_switch+0x120/0x618 kernel/sched/core.c:5213 context_switch kernel/sched/core.c:5346 [inline] __schedule+0x136c/0x23b8 kernel/sched/core.c:6669 schedule+0xc4/0x170 kernel/sched/core.c:6745 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2143 unix_wait_for_peer+0x1d8/0x2a8 net/unix/af_unix.c:1450 unix_dgram_sendmsg+0xd90/0x16c0 net/unix/af_unix.c:2048 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0x568/0x81c net/socket.c:2503 ___sys_sendmsg net/socket.c:2557 [inline] __sys_sendmmsg+0x318/0x7d8 net/socket.c:2643 __do_sys_sendmmsg net/socket.c:2672 [inline] __se_sys_sendmmsg net/socket.c:2669 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2669 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591