watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [udevd:5591] Modules linked in: irq event stamp: 2173717 hardirqs last enabled at (2173716): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (2173716): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (2173717): [] __el1_irq arch/arm64/kernel/entry-common.c:470 [inline] hardirqs last disabled at (2173717): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:488 softirqs last enabled at (2167946): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (2168589): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 CPU: 0 PID: 5591 Comm: udevd Not tainted 6.4.0-rc5-syzkaller-gf86b85033b8c #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 : 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_const_cmp4+0x14/0x98 kernel/kcov.c:304 lr : fq_pie_qdisc_dequeue+0x120/0x8ac net/sched/sch_fq_pie.c:246 sp : ffff800080007200 x29: ffff800080007280 x28: ffff0001052019b0 x27: ffff0000c6f822e8 x26: ffff0000c6f822f0 x25: dfff800000000000 x24: ffff0000c6f822e0 x23: ffff0001052019a0 x22: 0000000000000040 x21: 1fffe00020a40334 x20: ffff0000c6f822e0 x19: 0000000000000000 x18: ffff800080006e40 x17: 0000000000000000 x16: ffff80008050c56c x15: 0000000000000302 x14: 0000000000000100 x13: 0000000000000000 x12: 0000000000000001 x11: 0000000000000302 x10: 0000000000000100 x9 : 0000000000000302 x8 : ffff0000c40f5340 x7 : ffff80008041c668 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000c6f822e0 x1 : 0000000000000000 x0 : 0000000000000001 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_const_cmp4+0x14/0x98 kernel/kcov.c:304 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_restore arch/arm64/include/asm/irqflags.h:182 [inline] arch_local_irq_restore arch/arm64/include/asm/irqflags.h:202 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:1033 [inline] debug_check_no_obj_freed+0x50c/0x528 lib/debugobjects.c:1054 slab_free_hook mm/slub.c:1756 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0x24c/0x49c mm/slub.c:3799 kfree+0xb8/0x19c mm/slab_common.c:1015 skb_kfree_head net/core/skbuff.c:906 [inline] skb_free_head+0xd0/0x198 net/core/skbuff.c:918 skb_release_data+0x444/0x5c8 net/core/skbuff.c:948 skb_release_all net/core/skbuff.c:1014 [inline] __kfree_skb net/core/skbuff.c:1028 [inline] consume_skb+0x14c/0x414 net/core/skbuff.c:1244 skb_free_datagram+0x20/0x30 net/core/datagram.c:322 __unix_dgram_recvmsg+0x98c/0xe2c net/unix/af_unix.c:2532 unix_dgram_recvmsg+0xd0/0xe8 net/unix/af_unix.c:2549 sock_recvmsg_nosec net/socket.c:1019 [inline] sock_recvmsg net/socket.c:1040 [inline] ____sys_recvmsg+0x230/0x6e8 net/socket.c:2722 ___sys_recvmsg net/socket.c:2764 [inline] __sys_recvmsg+0x27c/0x350 net/socket.c:2794 __do_sys_recvmsg net/socket.c:2804 [inline] __se_sys_recvmsg net/socket.c:2801 [inline] __arm64_sys_recvmsg+0x80/0x94 net/socket.c:2801 __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