IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
INFO: task syz-executor0:9835 blocked for more than 120 seconds.
      Not tainted 4.9.102-g2e35bed #33
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D28712  9835   3887 0x00000004
 ffff8801d867b000 ffff8801b5d03480 ffff8801b5d03480 ffff8801b7813000
 ffff8801db321c18 ffff8801b5507ab8 ffffffff839e69ed ffff8801b5507ad8
 ffff8801cc2a9ba8 0000000000000000 0000000000000000 ffff8801db3224e8
Call Trace:
 [<ffffffff839e7fef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f3628>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f3628>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee7767>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122c590>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122c590>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff815a9afa>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff815a9afa>] filename_create+0x17a/0x490 fs/namei.c:3639
 [<ffffffff815abc2d>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815abc2d>] SYSC_mknodat fs/namei.c:3764 [inline]
 [<ffffffff815abc2d>] SyS_mknodat fs/namei.c:3752 [inline]
 [<ffffffff815abc2d>] SYSC_mknod fs/namei.c:3798 [inline]
 [<ffffffff815abc2d>] SyS_mknod+0x18d/0x420 fs/namei.c:3796
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f78d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/518:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136688c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136688c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425e10>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3776:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f5a92>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211f1b2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
2 locks held by syz-executor0/9835:
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e02ef>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e02ef>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#19/1){+.+.+.}, at: [<ffffffff815a9afa>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#19/1){+.+.+.}, at: [<ffffffff815a9afa>] filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor0/9847:
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e02ef>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e02ef>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#19/1){+.+.+.}, at: [<ffffffff815a9afa>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#19/1){+.+.+.}, at: [<ffffffff815a9afa>] filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor0/9866:
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e02ef>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e02ef>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#21){++++++}, at: [<ffffffff815a48d5>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#21){++++++}, at: [<ffffffff815a48d5>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#21){++++++}, at: [<ffffffff815a48d5>] path_openat+0xed5/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 1
CPU: 1 PID: 518 Comm: khungtaskd Not tainted 4.9.102-g2e35bed #33
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d93dfd08 ffffffff81eb3489 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9590 ffff8801d93dfd40
 ffffffff81ebe787 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb3489>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3489>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe787>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe71a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9694>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366e24>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366e24>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366e24>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366e24>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119cead>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f7a9c>] 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: 9789 Comm: syz-executor0 Not tainted 4.9.102-g2e35bed #33
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b7813000 task.stack: ffff8801d8b38000
RIP: 0010:[<ffffffff8123b913>] 
c [<ffffffff8123b913>] lock_release+0x6b3/0xb80 kernel/locking/lockdep.c:3779
RSP: 0018:ffff8801d8b3f1e8  EFLAGS: 00000283
RAX: 0000000000000007 RBX: ffffea0006757f00 RCX: ffff8801b7813000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000246
RBP: ffff8801d8b3f1f8 R08: ffff8801b7813960 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10036f02727 R12: ffff8801d62bf9f0
R13: dffffc0000000000 R14: 0000000000000004 R15: 0000000000000003
FS:  00007f1def9d1700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f744fa92140 CR3: 00000001c1344000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffea0006757f1c
c ffffea0006757f00
c ffff8801d8b3f260
c ffffffff81438d42
c
 ffffffff81438c00
c ffffea0006757f20
c ffffea0006757f00
c 0000000000000001
c
 ffff8801d6145f90
c ffffea0006757f00
c 0000000000000003
c 0000000000000007
c
Call Trace:
 [<ffffffff81438d42>] rcu_lock_release include/linux/rcupdate.h:498 [inline]
 [<ffffffff81438d42>] rcu_read_unlock include/linux/rcupdate.h:931 [inline]
 [<ffffffff81438d42>] find_get_entry+0x142/0x540 mm/filemap.c:1132
 [<ffffffff8143a07b>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1203
 [<ffffffff81624cb9>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff81624cb9>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff81624cb9>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff81624cb9>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff81624cb9>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff8162859d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b6408>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b6408>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818be207>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818be207>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818d8694>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818d8e71>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff8159ac8d>] lookup_open+0x63d/0x1930 fs/namei.c:3203
 [<ffffffff815a48f8>] do_last fs/namei.c:3315 [inline]
 [<ffffffff815a48f8>] path_openat+0xef8/0x3590 fs/namei.c:3534
 [<ffffffff815ab257>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156da2d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156dd87>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156dd87>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff8156dd87>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff8156dd87>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f78d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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cd0 
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c<41> 
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cb9 
c