ip6_tunnel: J xmit: Local address not yet configured! ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! ip6_tunnel: q xmit: Local address not yet configured! INFO: task kworker/0:4:16474 blocked for more than 140 seconds. Not tainted 4.14.124+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:4 D27720 16474 2 0x80000000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431 process_one_work+0x7c6/0x1510 kernel/workqueue.c:2134 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2271 kthread+0x310/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 INFO: task syz-executor.4:17757 blocked for more than 140 seconds. Not tainted 4.14.124+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27112 17757 1863 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 register_netdev+0xf/0x30 net/core/dev.c:7784 loopback_net_init+0x71/0x13b drivers/net/loopback.c:214 INFO: task syz-executor.2:17817 blocked for more than 140 seconds. Not tainted 4.14.124+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28648 17817 17187 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421 sock_do_ioctl+0x92/0xb0 net/socket.c:981 sock_ioctl+0x253/0x440 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x510 arch/x86/entry/common.c:292 INFO: task syz-executor.2:17819 blocked for more than 140 seconds. Not tainted 4.14.124+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27976 17819 17187 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 __netlink_dump_start+0x100/0x750 net/netlink/af_netlink.c:2265 netlink_dump_start include/linux/netlink.h:217 [inline] rtnetlink_rcv_msg+0x5b0/0xb40 net/core/rtnetlink.c:4255 netlink_rcv_skb+0x137/0x3a0 net/netlink/af_netlink.c:2432 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x478/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x65d/0xbe0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb7/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1de/0x2f0 net/socket.c:1731 do_syscall_64+0x19b/0x510 arch/x86/entry/common.c:292 INFO: task syz-executor.3:17806 blocked for more than 140 seconds. Not tainted 4.14.124+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29584 17806 1847 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421 sock_do_ioctl+0x92/0xb0 net/socket.c:981 sock_ioctl+0x253/0x440 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x510 arch/x86/entry/common.c:292 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<00000000ee23b70d>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1750: #0: (&tty->ldisc_sem){++++}, at: [<000000006adc1667>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000001d04c130>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 3 locks held by kworker/u4:28/11667: #0: ("%s""netns"){+.+.}, at: [<00000000fb5c4e56>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105 #1: (net_cleanup_work){+.+.}, at: [<00000000d21ef058>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109 #2: (net_mutex){+.+.}, at: [<0000000074d3d986>] cleanup_net+0x136/0x860 net/core/net_namespace.c:450 3 locks held by kworker/0:4/16474: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [<00000000fb5c4e56>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105 #1: ((addr_chk_work).work){+.+.}, at: [<00000000d21ef058>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109 #2: (rtnl_mutex){+.+.}, at: [<00000000299ca982>] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431 1 lock held by syz-executor.2/26815: #0: (rtnl_mutex){+.+.}, at: [<0000000097db0a97>] tun_detach drivers/net/tun.c:585 [inline] #0: (rtnl_mutex){+.+.}, at: [<0000000097db0a97>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2663 1 lock held by syz-executor.2/26825: #0: (rtnl_mutex){+.+.}, at: [<0000000097db0a97>] tun_detach drivers/net/tun.c:585 [inline] #0: (rtnl_mutex){+.+.}, at: [<0000000097db0a97>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2663 2 locks held by syz-executor.4/17757: #0: (net_mutex){+.+.}, at: [<00000000e921db27>] copy_net_ns+0x156/0x440 net/core/net_namespace.c:410 #1: (rtnl_mutex){+.+.}, at: [<000000007beb89a0>] register_netdev+0xf/0x30 net/core/dev.c:7784 1 lock held by syz-executor.2/17817: #0: (rtnl_mutex){+.+.}, at: [<00000000d069ece9>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421 1 lock held by syz-executor.2/17819: #0: (rtnl_mutex){+.+.}, at: [<00000000cd9104fc>] __netlink_dump_start+0x100/0x750 net/netlink/af_netlink.c:2265 1 lock held by syz-executor.3/17806: #0: (rtnl_mutex){+.+.}, at: [<00000000d069ece9>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.124+ #3 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1620 Comm: rs:main Q:Reg Not tainted 4.14.124+ #3 task: 000000005a397ef5 task.stack: 00000000d42c1e79 RIP: 0010:__lock_release kernel/locking/lockdep.c:3797 [inline] RIP: 0010:lock_release+0x366/0x730 kernel/locking/lockdep.c:4010 RSP: 0018:ffff8881d481f5c0 EFLAGS: 00000806 RAX: 0000000000000000 RBX: 1ffff1103a903ebb RCX: 1ffff1103a9d9cc4 RDX: 1ffff1103a9d9cc5 RSI: 0000000000000003 RDI: ffff8881d4ecde00 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8881d4ece680 R11: 0000000000000001 R12: bbcdf539e191e184 R13: ffff8881d4ecde00 R14: 0000000000000003 R15: ffff8881d4ece628 FS: 00007f071ba61700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000f102d0 CR3: 00000001d6c52004 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: Code: 38 c5 7c 08 84 c0 0f 85 22 03 00 00 8b 15 93 fd 81 03 85 d2 75 32 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e 64 03 00 00 45 8d 4e ff 45 39 8d 28 08