FAT-fs (loop2): Directory bread(block 7) failed
FAT-fs (loop2): Directory bread(block 8) failed
FAT-fs (loop2): Directory bread(block 9) failed
FAT-fs (loop2): Directory bread(block 10) failed
FAT-fs (loop2): Directory bread(block 11) failed
INFO: task syz-executor3:8790 blocked for more than 140 seconds.
      Not tainted 4.9.112-g9e79039 #7
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D28504  8790   3883 0x00000004
 ffff88019de4b000 0000000000000000 ffff8801d78f8000 ffff8801d9a6b000
 ffff8801db321c18 ffff8801d5667680 ffffffff839e907d ffffffff81235667
 0000000000000000 ffff88019de4b8c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea67f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f4aa4>] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81ee74f8>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff839f39d2>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff839f39d2>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
 [<ffffffff815a1336>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3c96>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff815a3c96>] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283
 [<ffffffff815a9747>] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317
 [<ffffffff815a9b03>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff815a9b03>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81580ae6>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81580ae6>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff81581d89>] vfs_lstat fs/stat.c:129 [inline]
 [<ffffffff81581d89>] SYSC_newlstat+0x89/0x100 fs/stat.c:283
 [<ffffffff815820cd>] SyS_newlstat+0x1d/0x30 fs/stat.c:277
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f53>] 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: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3769:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8122>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211edc2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor3/8790:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor3/8792:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor3/8793:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor3/8798:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a2f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a2f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#4/1){+.+.+.}, at: [<ffffffff815aa01a>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&type->i_mutex_dir_key#4/1){+.+.+.}, at: [<ffffffff815aa01a>] filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor3/8800:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a2f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a2f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#4/1){+.+.+.}, at: [<ffffffff815aa01a>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&type->i_mutex_dir_key#4/1){+.+.+.}, at: [<ffffffff815aa01a>] filename_create+0x17a/0x490 fs/namei.c:3639
1 lock held by syz-executor3/8803:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff815e184c>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff815e184c>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor3/8806:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor3/8807:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor3/8808:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor3/8810:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a2f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e0a2f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#4/1){+.+.+.}, at: [<ffffffff815aa01a>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&type->i_mutex_dir_key#4/1){+.+.+.}, at: [<ffffffff815aa01a>] filename_create+0x17a/0x490 fs/namei.c:3639

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.112-g9e79039 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8557d08 ffffffff81eb3249 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d8557d40
 ffffffff81ebe547 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81eb3249>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3249>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe547>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe4da>] 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
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0bd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa11c>] 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: 8723 Comm: syz-executor3 Not tainted 4.9.112-g9e79039 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019e920000 task.stack: ffff8801d5608000
RIP: 0010:[<ffffffff812309d6>] 
c [<ffffffff812309d6>] lock_is_held+0x16/0x140 kernel/locking/lockdep.c:3783
RSP: 0018:ffff8801d560f938  EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88019e920000 RCX: ffffc900058e5000
RDX: 0000000000000000 RSI: ffffffff846def60 RDI: ffffffff846def20
RBP: ffff8801d560f950 R08: ffff88019e920910 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff846def20 R14: 00000000000001cc R15: ffff8801b80fe950
FS:  00007f4a90cd4700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ef58ea140 CR3: 00000001be2a0000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff88019e920000
c 0000000000000000
c ffffffff83db4480
c ffff8801d560f988
c
 ffffffff811bb567
c ffff88019e920000
c ffffffff83db4480
c 00000000000001cc
c
 0000000000000000
c ffff8801b80fe950
c ffff8801d560f9c8
c ffffffff811bb695
c
Call Trace:
 [<ffffffff811bb567>] ___might_sleep+0x1c7/0x260 kernel/sched/core.c:7958
 [<ffffffff811bb695>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7949
 [<ffffffff81907a54>] request_wait_answer+0x124/0x6e0 fs/fuse/dev.c:459
 [<ffffffff81908669>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:480
 [<ffffffff8190876d>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:493
 [<ffffffff819129c4>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:551
 [<ffffffff81918742>] create_new_entry.constprop.31+0x1a2/0x490 fs/fuse/dir.c:600
 [<ffffffff819192de>] fuse_mkdir+0x21e/0x2c0 fs/fuse/dir.c:679
 [<ffffffff81599869>] vfs_mkdir2+0x3c9/0x630 fs/namei.c:3820
 [<ffffffff815ac5f3>] SYSC_mkdirat fs/namei.c:3849 [inline]
 [<ffffffff815ac5f3>] SyS_mkdirat+0x213/0x260 fs/namei.c:3833
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c