IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready NOHZ: local_softirq_pending 08 watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/0:0:5] Modules linked in: irq event stamp: 176515 hardirqs last enabled at (176514): [] restore_regs_and_return_to_kernel+0x0/0x2e hardirqs last disabled at (176515): [] interrupt_entry+0xbf/0xc0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (171074): [] ipv6_chk_mcast_addr+0x21a/0x710 net/ipv6/mcast.c:1028 softirqs last disabled at (171076): [] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] softirqs last disabled at (171076): [] ip6_finish_output2+0x1f0/0x1ec0 net/ipv6/ip6_output.c:106 CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 4.18.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:fq_codel_dequeue+0x90/0x2260 net/sched/sch_fq_codel.c:304 Code: 48 c1 e8 03 80 3c 18 00 0f 85 81 19 00 00 48 8b 45 d0 4c 8b 30 49 8d 46 10 48 89 85 58 ff ff ff 48 c1 e8 03 0f b6 04 18 84 c0 <74> 08 3c 03 0f 8e 4a 19 00 00 45 8b 66 10 45 85 e4 0f 8e c8 09 00 RSP: 0018:ffff8800b4ad6c78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8800894b5080 RDX: ffff8800894b5078 RSI: ffff8800894b5068 RDI: ffff88008955e0d8 RBP: ffff8800b4ad6d40 R08: ffff8800b4bded78 R09: 000000000000000a R10: ffff8800b4bded58 R11: 0000000000000001 R12: ffff8800894b5078 R13: ffff8800894b5078 R14: ffff88008955e0d0 R15: ffff8800894b4d80 FS: 0000000000000000(0000) GS:ffff8800ba600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052f7f0 CR3: 000000000926a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dequeue_skb net/sched/sch_generic.c:277 [inline] qdisc_restart net/sched/sch_generic.c:380 [inline] __qdisc_run+0x163/0x15d0 net/sched/sch_generic.c:398 __dev_xmit_skb net/core/dev.c:3278 [inline] __dev_queue_xmit+0x119a/0x2960 net/core/dev.c:3537 dev_queue_xmit+0xb/0x10 net/core/dev.c:3602 neigh_hh_output include/net/neighbour.h:473 [inline] neigh_output include/net/neighbour.h:481 [inline] ip_finish_output2+0x944/0x1200 net/ipv4/ip_output.c:229 ip_finish_output+0x402/0xb50 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip_output+0x1c1/0x540 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0x78/0x130 net/ipv4/ip_output.c:124 iptunnel_xmit+0x4e2/0x880 net/ipv4/ip_tunnel_core.c:91 udp_tunnel_xmit_skb+0x230/0x3a0 net/ipv4/udp_tunnel.c:182 geneve_xmit_skb drivers/net/geneve.c:851 [inline] geneve_xmit+0xd9b/0x29e0 drivers/net/geneve.c:926 __netdev_start_xmit include/linux/netdevice.h:4148 [inline] netdev_start_xmit include/linux/netdevice.h:4157 [inline] xmit_one net/core/dev.c:3034 [inline] dev_hard_start_xmit+0x15e/0x780 net/core/dev.c:3050 __dev_queue_xmit+0x20a2/0x2960 net/core/dev.c:3569 dev_queue_xmit+0xb/0x10 net/core/dev.c:3602 neigh_hh_output include/net/neighbour.h:473 [inline] neigh_output include/net/neighbour.h:481 [inline] ip6_finish_output2+0xc2f/0x1ec0 net/ipv6/ip6_output.c:120 ip6_finish_output+0x43c/0xa50 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip6_output+0x1bb/0x630 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] mld_sendpack+0x63d/0xe60 net/ipv6/mcast.c:1683 mld_send_initial_cr.part.16+0xd7/0x110 net/ipv6/mcast.c:2100 mld_send_initial_cr net/ipv6/mcast.c:2113 [inline] ipv6_mc_dad_complete+0x14d/0x1a0 net/ipv6/mcast.c:2107 addrconf_dad_completed+0x861/0xba0 net/ipv6/addrconf.c:4118 addrconf_dad_work+0x63e/0xf70 net/ipv6/addrconf.c:4049 process_one_work+0x7b9/0x1580 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x316/0x3d0 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54