watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:9:24664] Modules linked in: irq event stamp: 1114793 hardirqs last enabled at (1114792): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (1114792): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (1114793): [] __el1_irq arch/arm64/kernel/entry-common.c:470 [inline] hardirqs last disabled at (1114793): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:488 softirqs last enabled at (1109974): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1109978): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 PID: 24664 Comm: kworker/0:9 Not tainted 6.4.0-rc7-syzkaller-ge40939bbfc68 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 Workqueue: mld mld_ifc_work pstate: 80400005 (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:173 [inline] pc : write_comp_data kernel/kcov.c:236 [inline] pc : __sanitizer_cov_trace_cmp8+0x14/0x90 kernel/kcov.c:284 lr : find_entry_to_transmit+0x3d0/0x6d0 net/sched/sch_taprio.c:354 sp : ffff8000a4296fd0 x29: ffff8000a42970a0 x28: 0539babd6322a0ed x27: ffff0000cf32d540 x26: ffff0000cf32d568 x25: 1fffe00019e65aad x24: 0000000000000000 x23: 0539babde322a001 x22: 0539babde322a040 x21: 000000000000003f x20: dfff800000000000 x19: 000000000000002c x18: ffff8000a42977e0 x17: 0000000000000000 x16: ffff80008050b4cc x15: 0000000000000000 x14: 1ffff00011bde0ac x13: ffffffff80000040 x12: 0000000080000040 x11: 0000000000000201 x10: 0000000000000000 x9 : 0000000000000201 x8 : ffff0000d19e8000 x7 : 0000000000000000 x6 : ffff8000a42971f0 x5 : ffff8000a4297210 x4 : 0539babd6322a0ed x3 : ffff80008898bde8 x2 : 0000000000000000 x1 : 000000000000003f x0 : 000000000000002c Call trace: preempt_count arch/arm64/include/asm/preempt.h:13 [inline] check_kcov_mode kernel/kcov.c:173 [inline] write_comp_data kernel/kcov.c:236 [inline] __sanitizer_cov_trace_cmp8+0x14/0x90 kernel/kcov.c:284 get_packet_txtime net/sched/sch_taprio.c:505 [inline] taprio_enqueue_one+0xdb0/0x146c net/sched/sch_taprio.c:574 taprio_enqueue+0x328/0x544 net/sched/sch_taprio.c:655 dev_qdisc_enqueue+0x60/0x35c net/core/dev.c:3773 __dev_xmit_skb net/core/dev.c:3862 [inline] __dev_queue_xmit+0xb24/0x3318 net/core/dev.c:4210 dev_queue_xmit include/linux/netdevice.h:3088 [inline] neigh_hh_output include/net/neighbour.h:528 [inline] neigh_output include/net/neighbour.h:542 [inline] ip6_finish_output2+0xd2c/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+0x160/0x4f0 include/linux/netfilter.h:303 mld_sendpack+0x904/0x1358 net/ipv6/mcast.c:1820 mld_send_cr net/ipv6/mcast.c:2121 [inline] mld_ifc_work+0x848/0xc20 net/ipv6/mcast.c:2653 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552 kthread+0x288/0x310 kernel/kthread.c:379 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853