IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
INFO: task syz-executor1:9389 blocked for more than 140 seconds.
      Not tainted 4.9.116-g0137ea2 #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D29256  9389   3885 0x00000004
 ffff8801b966b000 ffff8801ce9caa00 ffff8801d823c540 ffff88019adb3000
 ffff8801db221c18 ffff88019a2d7878 ffffffff839ead0d dffffc0000000000
 ffff8801cbcb1870 ffff88019a2d7838 00ff8801b966b8c0 ffff8801db2224e8
Call Trace:
 [<ffffffff839ec30f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff815c7ec2>] d_wait_lookup fs/dcache.c:2455 [inline]
 [<ffffffff815c7ec2>] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537
 [<ffffffff81594e7c>] lookup_slow+0x19c/0x470 fs/namei.c:1650
 [<ffffffff815a79aa>] mountpoint_last fs/namei.c:2657 [inline]
 [<ffffffff815a79aa>] path_mountpoint+0x38a/0x1360 fs/namei.c:2697
 [<ffffffff815a9deb>] filename_mountpoint.part.56+0x15b/0x310 fs/namei.c:2717
 [<ffffffff815ab649>] filename_mountpoint fs/namei.c:2714 [inline]
 [<ffffffff815ab649>] user_path_mountpoint_at+0x49/0x70 fs/namei.c:2747
 [<ffffffff815e2926>] SYSC_umount fs/namespace.c:1692 [inline]
 [<ffffffff815e2926>] SyS_umount+0x126/0x3f0 fs/namespace.c:1676
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fbc13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136677c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136677c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425e07>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3670:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d835c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572e3e>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572e3e>] vfs_write+0x3ae/0x530 fs/read_write.c:556
2 locks held by getty/3768:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f9db2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82120212>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor1/9389:
 #0:  (&type->i_mutex_dir_key#6){.+.+.+}, at: [<ffffffff81594e21>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#6){.+.+.+}, at: [<ffffffff81594e21>] lookup_slow+0x141/0x470 fs/namei.c:1645

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.116-g0137ea2 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8bffd08 ffffffff81eb46a9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d8bffd40
 ffffffff81ebf9a7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb46a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb46a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf9a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf93a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366d14>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d14>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d14>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d14>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fbddc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9382 Comm: syz-executor1 Not tainted 4.9.116-g0137ea2 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019adb6000 task.stack: ffff8801d4658000
RIP: 0010:[<ffffffff812369ce>] 
c [<ffffffff812369ce>] iterate_chain_key kernel/locking/lockdep.c:319 [inline]
RIP: 0010:[<ffffffff812369ce>] 
c [<ffffffff812369ce>] __lock_acquire+0x81e/0x4070 kernel/locking/lockdep.c:3340
RSP: 0018:ffff8801d465f140  EFLAGS: 00000086
RAX: e07c2de400000000 RBX: ffff88019adb6918 RCX: 0000000029eff09e
RDX: 000000000d4f3d00 RSI: ffff88019adb6918 RDI: 0000000000000000
RBP: ffff8801d465f2f0 R08: ffff88019adb6938 R09: 0000000000000000
R10: ffff88019adb6000 R11: 1ffff100335b6d22 R12: 000000009d4fd9a7
R13: 0000000000000000 R14: 0000000052ad879c R15: 00000000baa1b564
FS:  00007f4939c2b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000017b0b10 CR3: 00000001d97c1000 CR4: 00000000001606f0
DR0: 00000000200001c0 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 0000000000000046
c 0000000000000001
c ffff88019adb68c8
c ffffed00335b6d18
c
 ffff88019adb6000
c dffffc0000000000
c ffff8801d465f1c0
c ffffffff81235647
c
 0000000000000000
c ffff88019adb68c0
c ffffffff8560f5e0
c ffff88019adb6000
c
Call Trace:
 [<ffffffff8123ac90>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff839fbb2e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff839fbb2e>] _raw_spin_lock_irqsave+0x4e/0x62 kernel/locking/spinlock.c:159
 [<ffffffff812215bb>] prepare_to_wait_event+0x6b/0x450 kernel/sched/wait.c:213
 [<ffffffff81907a9e>] request_wait_answer+0x22e/0x6e0 fs/fuse/dev.c:459
 [<ffffffff819085a9>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:480
 [<ffffffff819086ad>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:493
 [<ffffffff81912904>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:551
 [<ffffffff8191aca3>] fuse_lookup_name+0x253/0x5d0 fs/fuse/dir.c:369
 [<ffffffff8191b10d>] fuse_lookup+0xed/0x3a0 fs/fuse/dir.c:406
 [<ffffffff81594f1e>] lookup_slow+0x23e/0x470 fs/namei.c:1668
 [<ffffffff815a14a6>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3e06>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff815a3e06>] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283
 [<ffffffff815a98b7>] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317
 [<ffffffff815a9c73>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff815a9c73>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81580c56>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81580c56>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff81581e06>] vfs_stat fs/stat.c:123 [inline]
 [<ffffffff81581e06>] SYSC_newstat+0x86/0xf0 fs/stat.c:270
 [<ffffffff8158220d>] SyS_newstat+0x1d/0x30 fs/stat.c:266
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fbc13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c31 
cfc 
c46 
c8d 
c3c 
c30 
c44 
c89 
ce0 
c45 
c29 
ce6 
cc1 
cc8 
c0d 
c44 
c89 
cfa 
c45 
c01 
ce7 
c41 
c31 
cc6 
c44 
c89 
cf0 
c44 
c29 
cf2 
cc1 
cc0 
c04 
c31 
cd0 
c43 
c8d 
c14 
c37 
c48 
cc1 
ce0 
c20 
c<48> 
c09 
cd0 
c48 
c85 
cff 
c49 
c89 
cc7 
c74 
c27 
c4c 
c89 
c54 
c24 
c60 
c44 
c89 
c8c 
c24 
c98 
c