ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! INFO: task syz-executor.4:22191 blocked for more than 140 seconds. Not tainted 4.9.186+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25016 22191 1 0x00000004 0000000000000087 ffff8801a4b1df00 ffff8801cf112100 ffff8801db621000 ffff8801d1e78000 ffff8801db621018 ffff8801aa7ef598 ffffffff8280c5ee ffff8801aa7ef4d8 ffffffff81bc08fc 00ff8801aa7ef5d0 ffff8801db6218f0 Call Trace: [<00000000bc9a4cde>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000358f33e7>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000ce6fd74f>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000ce6fd74f>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<0000000037c79c4d>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 [<000000000871d258>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406 [<000000008d64641f>] lookup_slow+0x24b/0x480 fs/namei.c:1709 [<00000000a88aa014>] walk_component+0x71e/0xce0 fs/namei.c:1825 [<00000000b0029fa7>] link_path_walk+0x897/0x1200 fs/namei.c:2161 [<00000000316690ca>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737 [<0000000070a26942>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758 [<000000006954b6be>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788 [<0000000037e36bab>] SYSC_umount fs/namespace.c:1722 [inline] [<0000000037e36bab>] SyS_umount+0x136/0xd30 fs/namespace.c:1706 [<00000000a153113d>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000755771c5>] 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: [<00000000ac814e81>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000ac814e81>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000df8a35c8>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by getty/2025: #0: (&tty->ldisc_sem){++++++}, at: [<000000004f27cbb6>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000097592375>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.4/22191: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000008768ca5a>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000008768ca5a>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<0000000037c79c4d>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 2 locks held by syz-executor.4/24076: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000008768ca5a>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<000000008768ca5a>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<0000000037c79c4d>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.186+ #10 ffff8801d98d7cc8 ffffffff81b5a0b1 0000000000000000 0000000000000000 0000000000000000 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6534c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<00000000f5f4bbfd>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000f5f4bbfd>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000f8671ac2>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000663ace69>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000045e655a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000009d8bd63e>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000009d8bd63e>] check_hung_task kernel/hung_task.c:126 [inline] [<000000009d8bd63e>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000009d8bd63e>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<0000000092def7ec>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000006fdf743a>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3686 Comm: syz-executor.0 Not tainted 4.9.186+ #10 task: 000000004f95f8dd task.stack: 000000005620e944 RIP: 0033:[<000000000040199b>] c [<00000000371f1dab>] 0x40199b RSP: 002b:00007f93eaffb690 EFLAGS: 00000286 RAX: 00000000ec5f87db RBX: 000000000000000b RCX: 0000000000459829 RDX: 0000000000000000 RSI: 00007f93eaffb6c0 RDI: 000000000000000b RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f93eaffc700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000007141b4 CR3: 00000001c80ba000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600