ip6_tunnel: Ò xmit: Local address not yet configured! ip6_tunnel: Ð xmit: Local address not yet configured! ip6_tunnel: ¢ xmit: Local address not yet configured! ip6_tunnel: 4 xmit: Local address not yet configured! INFO: task syz-executor.4:13176 blocked for more than 140 seconds. Not tainted 4.9.194+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27672 13176 8502 0x00000004 0000000000000083 ffff8801a0e8c740 ffff8801d19b5800 ffff8801db721000 ffff8801d11097c0 ffff8801db721018 ffff88015b4cfab8 ffffffff8281af8e 0000000002080020 ffff88015b4cfa30 00ffffff814fdb57 ffff8801db7218f0 Call Trace: [<000000002755d669>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000d700ec0a>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000985c0761>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000985c0761>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000004e605890>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 [<00000000ba22707e>] register_netdev+0x13/0x30 net/core/dev.c:7436 [<0000000022833f24>] loopback_net_init+0x78/0x150 drivers/net/loopback.c:202 [<000000003bcc1a12>] ops_init+0xb0/0x3a0 net/core/net_namespace.c:111 [<0000000003dbca3f>] setup_net+0x1c8/0x500 net/core/net_namespace.c:292 [<000000002bf46878>] copy_net_ns+0x191/0x340 net/core/net_namespace.c:409 [<0000000030b7ba09>] create_new_namespaces+0x37c/0x7a0 kernel/nsproxy.c:106 [<0000000033917cb8>] unshare_nsproxy_namespaces+0xab/0x1e0 kernel/nsproxy.c:205 [<00000000f91d4905>] SYSC_unshare kernel/fork.c:2402 [inline] [<00000000f91d4905>] SyS_unshare+0x305/0x6f0 kernel/fork.c:2352 [<000000006dce5157>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000d685fe19>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<0000000077df8be5>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<0000000077df8be5>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.?..}, at: [<00000000e8802415>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by getty/2023: #0: (&tty->ldisc_sem){++++++}, at: [<000000002fade671>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000072b5f224>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by kworker/1:10/10158: #0: ("events"){.+.+.+}, at: [<000000005efc0e7a>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 #1: ((&rew.rew_work)){+.+...}, at: [<00000000d7fff88d>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 2 locks held by syz-executor.4/13176: #0: (net_mutex){+.+.+.}, at: [<000000006856c809>] copy_net_ns+0x15b/0x340 net/core/net_namespace.c:407 #1: (rtnl_mutex){+.+.+.}, at: [<000000004e605890>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 2 locks held by syz-executor.0/13187: #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnl_lock net/core/rtnetlink.c:70 [inline] #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnetlink_rcv+0x1c/0x40 net/core/rtnetlink.c:4086 #1: (rcu_preempt_state.exp_mutex){+.+...}, at: [<00000000ed4ae391>] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline] #1: (rcu_preempt_state.exp_mutex){+.+...}, at: [<00000000ed4ae391>] _synchronize_rcu_expedited+0x339/0x850 kernel/rcu/tree_exp.h:569 1 lock held by syz-executor.0/13191: #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnl_lock net/core/rtnetlink.c:70 [inline] #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnetlink_rcv+0x1c/0x40 net/core/rtnetlink.c:4086 1 lock held by syz-executor.1/13190: #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnl_lock net/core/rtnetlink.c:70 [inline] #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnetlink_rcv+0x1c/0x40 net/core/rtnetlink.c:4086 1 lock held by syz-executor.1/13196: #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnl_lock net/core/rtnetlink.c:70 [inline] #0: (rtnl_mutex){+.+.+.}, at: [<000000003f65ae24>] rtnetlink_rcv+0x1c/0x40 net/core/rtnetlink.c:4086 3 locks held by kworker/0:13/13215: #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [<000000005efc0e7a>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 #1: ((addr_chk_work).work){+.+...}, at: [<00000000d7fff88d>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 #2: (rtnl_mutex){+.+.+.}, at: [<000000004e605890>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0 ffff8801d98d7cc8 ffffffff81b67001 0000000000000001 0000000000000000 0000000000000001 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b7229c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<0000000099d66d42>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000099d66d42>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<000000003c68196f>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<0000000092dcb54b>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000fcfb3b26>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000e1de0367>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000e1de0367>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000e1de0367>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000e1de0367>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000edaa46a3>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000fdade320>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8282a0e1