ip6_tunnel: 6tnl0 xmit: Local address not yet configured! ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! ip6_tunnel: 6tnl0 xmit: Local address not yet configured! ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! INFO: task kworker/u4:2:368 blocked for more than 140 seconds. Not tainted 4.14.91+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:2 D25936 368 2 0x80000000 Workqueue: netns cleanup_net Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 cleanup_net+0x136/0x860 net/core/net_namespace.c:449 process_one_work+0x7c6/0x14e0 kernel/workqueue.c:2114 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2248 kthread+0x310/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 INFO: task syz-executor3:18662 blocked for more than 140 seconds. Not tainted 4.14.91+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D27960 18662 17703 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3490 _synchronize_rcu_expedited+0x5ab/0x850 kernel/rcu/tree_exp.h:615 synchronize_net+0x2b/0x40 net/core/dev.c:8214 nf_register_net_hook+0x5e6/0x8c0 net/netfilter/core.c:294 nf_register_net_hooks+0x47/0xa0 net/netfilter/core.c:382 ops_init+0xad/0x3e0 net/core/net_namespace.c:118 setup_net+0x22b/0x520 net/core/net_namespace.c:294 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:418 create_new_namespaces+0x366/0x750 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xa5/0x1e0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2377 [inline] SyS_unshare+0x300/0x690 kernel/fork.c:2327 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 INFO: task syz-executor2:18765 blocked for more than 140 seconds. Not tainted 4.14.91+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D28848 18765 1842 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3490 schedule_timeout+0x736/0xe80 kernel/time/timer.c:1721 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:123 flush_work+0x3d2/0x710 kernel/workqueue.c:2885 lru_add_drain_all_cpuslocked mm/swap.c:722 [inline] lru_add_drain_all_cpuslocked+0x2d5/0x420 mm/swap.c:691 lru_add_drain_all+0xf/0x20 mm/swap.c:730 invalidate_bdev+0x8a/0xc0 fs/block_dev.c:109 loop_clr_fd+0x3d1/0xac0 drivers/block/loop.c:1052 lo_ioctl+0x6e3/0x17e0 drivers/block/loop.c:1383 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x4d9/0x1810 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1873 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/0x4b0 arch/x86/entry/common.c:289 INFO: task syz-executor2:18769 blocked for more than 140 seconds. Not tainted 4.14.91+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D29400 18769 1842 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 lo_ioctl+0x87/0x17e0 drivers/block/loop.c:1373 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x4d9/0x1810 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1873 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/0x4b0 arch/x86/entry/common.c:289 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 3 locks held by kworker/u4:2/368: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x136/0x860 net/core/net_namespace.c:449 2 locks held by getty/1742: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-executor3/18662: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:409 #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [] exp_funnel_lock kernel/rcu/tree_exp.h:272 [inline] #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [] _synchronize_rcu_expedited+0x307/0x850 kernel/rcu/tree_exp.h:596 3 locks held by syz-executor2/18765: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x17e0 drivers/block/loop.c:1373 #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:138 [inline] #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] lru_add_drain_all+0xa/0x20 mm/swap.c:729 #2: (lock#4){+.+.}, at: [] lru_add_drain_all_cpuslocked+0x6c/0x420 mm/swap.c:704 1 lock held by syz-executor2/18769: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x17e0 drivers/block/loop.c:1373 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.91+ #1 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3523 Comm: kworker/1:5 Not tainted 4.14.91+ #1 Workqueue: events rtc_timer_do_work task: ffff8881c590c680 task.stack: ffff88819a3c8000 RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline] RIP: 0010:do_raw_spin_unlock+0x2e/0x210 kernel/locking/spinlock_debug.c:134 RSP: 0018:ffff88819a3cfb20 EFLAGS: 00000002 RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffff11038b219d4 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8881d5c685cc RBP: ffff8881d5c685c8 R08: 0000000000000001 R09: 0000000000000003 R10: ffff8881c590cf28 R11: 0000000000000001 R12: 0000000000000286 R13: ffff8881d5c685c8 R14: ffff8881d5c68690 R15: ffffffff9567c080 FS: 0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000019ee26006 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irqrestore+0x23/0x70 kernel/locking/spinlock.c:192 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] rtc_handle_legacy_irq+0x10b/0x180 drivers/rtc/interface.c:521 rtc_timer_do_work+0x21d/0x610 drivers/rtc/interface.c:881 process_one_work+0x7c6/0x14e0 kernel/workqueue.c:2114 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2248 kthread+0x310/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Code: 00 00 00 00 fc ff df 41 55 41 54 55 48 89 fd 48 83 c7 04 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 <84> d2 0f 85 a2 01 00 00 81 7d 04 ad 4e ad de 0f 85 5a 01 00 00