ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: À xmit: Local address not yet configured!
INFO: task syz-executor3:12725 blocked for more than 140 seconds.
      Not tainted 4.9.140+ #68
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D26872 12725   2109 0x00000004
 ffff8801ccf82f80 ffff8801d7e75280 ffff8801d7e73700 ffff88019ec997c0
 ffff8801db621018 ffff88019f3b7830 ffffffff82807402 ffff88019f3b7808
 ffffffff81206da7 0000000000000000 00ff8801ccf83828 ffff8801db6218f0
Call Trace:
 [<ffffffff8280892f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8281272a>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff8281272a>] rwsem_down_write_failed+0x39a/0x730 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81b75467>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8281154c>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8281154c>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff8153cf13>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff8153cf13>] do_last fs/namei.c:3312 [inline]
 [<ffffffff8153cf13>] path_openat+0xf13/0x2790 fs/namei.c:3534
 [<ffffffff81541617>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8150617d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8150645d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8150645d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff828176d3>] 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: [<ffffffff8131c0cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2021:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815792>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor3/12725:
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815755ef>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815755ef>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8153cf13>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8153cf13>] do_last fs/namei.c:3312 [inline]
 #1:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8153cf13>] path_openat+0xf13/0x2790 fs/namei.c:3534
1 lock held by syz-executor3/12741:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8157651c>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8157651c>] lock_mount+0x8c/0x2c0 fs/namespace.c:2113
1 lock held by syz-executor3/12744:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152a634>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152a634>] lookup_slow+0x154/0x470 fs/namei.c:1645
1 lock held by syz-executor3/12745:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152a634>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152a634>] lookup_slow+0x154/0x470 fs/namei.c:1645
2 locks held by syz-executor3/12746:
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815755ef>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815755ef>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff81585419>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff81585419>] vfs_removexattr+0x79/0x1b0 fs/xattr.c:392

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.140+ #68
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8281789c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12713 Comm: syz-executor3 Not tainted 4.9.140+ #68
task: ffff8801a0668000 task.stack: ffff88019fe08000
RIP: 0010:[<ffffffff81206f27>] 
c [<ffffffff81206f27>] arch_local_save_flags arch/x86/include/asm/paravirt.h:763 [inline]
RIP: 0010:[<ffffffff81206f27>] 
c [<ffffffff81206f27>] trace_hardirqs_on_caller+0x117/0x590 kernel/locking/lockdep.c:2719
RSP: 0000:ffff88019fe0f800  EFLAGS: 00000046
RAX: 0000000000000046 RBX: ffffffff841eb840 RCX: 0000000000000002
RDX: 0000000000000004 RSI: 0000000000000002 RDI: ffff8801a0668878
RBP: ffff88019fe0f810 R08: 1ffff10033fc1f2f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82816dfa
R13: ffff88019fe0f958 R14: ffff88019fe0f970 R15: ffff8801d0dba7a8
FS:  00007ff1e2c32700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000019af000 CR3: 00000001d98ee000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 0000000000000296
c ffff8801d0dba7a8
c ffff88019fe0f820
c ffffffff812073ad
c
 ffff88019fe0f840
c ffffffff82816dfa
c 1ffff10033fc1f0f
c fffffffffffffe00
c
 ffff88019fe0f900
c ffffffff811ee63c
c 00000000000001de
c ffff8801d0dba708
c
Call Trace:
 [<ffffffff812073ad>] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
 [<ffffffff82816dfa>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 [<ffffffff82816dfa>] _raw_spin_unlock_irqrestore+0x5a/0x70 kernel/locking/spinlock.c:191
 [<ffffffff811ee63c>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline]
 [<ffffffff811ee63c>] prepare_to_wait_event+0x26c/0x8c0 kernel/sched/wait.c:238
 [<ffffffff8185a47e>] request_wait_answer+0x22e/0x820 fs/fuse/dev.c:477
 [<ffffffff8185ee89>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:498
 [<ffffffff8185ef8d>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:511
 [<ffffffff81866bf4>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:569
 [<ffffffff81890416>] fuse_removexattr+0x186/0x2b0 fs/fuse/xattr.c:165
 [<ffffffff8189059d>] fuse_xattr_set+0x5d/0x70 fs/fuse/xattr.c:190
 [<ffffffff81584d24>] __vfs_removexattr+0x104/0x170 fs/xattr.c:378
 [<ffffffff8158543e>] vfs_removexattr+0x9e/0x1b0 fs/xattr.c:397
 [<ffffffff81585605>] removexattr+0xb5/0x110 fs/xattr.c:695
 [<ffffffff81585796>] path_removexattr+0x136/0x150 fs/xattr.c:709
 [<ffffffff81587502>] SYSC_removexattr fs/xattr.c:723 [inline]
 [<ffffffff81587502>] SyS_removexattr+0x22/0x30 fs/xattr.c:720
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff828176d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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