FAT-fs (loop4): Unrecognized mount option "ÿbp9;2" or missing value
FAT-fs (loop4): error, invalid access to FAT (entry 0x00000ff0)
FAT-fs (loop4): Filesystem has been set read-only
FAT-fs (loop4): error, invalid access to FAT (entry 0x00000ff0)
INFO: task syz-executor7:26350 blocked for more than 140 seconds.
      Not tainted 4.9.113-g9905591 #14
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D29496 26350   3881 0x00000004
 ffff88019925c800 ffff8801d00dea00 ffff8801d3d05a40 ffff880198020000
 ffff8801db321c18 ffff88019acdfac8 ffffffff839e929d ffffffff81235647
 0000000000000000 ffff88019925d0c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea89f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f5ed8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f5ed8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee7587>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122c270>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122c270>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff815aa01a>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff815aa01a>] filename_create+0x17a/0x490 fs/namei.c:3639
 [<ffffffff815ac49b>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815ac49b>] SYSC_mkdirat fs/namei.c:3841 [inline]
 [<ffffffff815ac49b>] SyS_mkdirat+0xbb/0x260 fs/namei.c:3833
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fa193>] 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 rs:main Q:Reg/3680:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572cce>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572cce>] vfs_write+0x3ae/0x530 fs/read_write.c:556
2 locks held by getty/3778:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8342>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211ee22>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor7/26350:
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e0a8f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e0a8f>] 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-executor7/26352:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff815890c3>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1370
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff815a56fc>] inode_lock_shared include/linux/fs.h:776 [inline]
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff815a56fc>] do_last fs/namei.c:3314 [inline]
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff815a56fc>] path_openat+0x17dc/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g9905591 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8447d08 ffffffff81eb32a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d8447d40
 ffffffff81ebe5a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe53a>] 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
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa35c>] 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: 26263 Comm: syz-executor7 Not tainted 4.9.113-g9905591 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff880198024800 task.stack: ffff88019a770000
RIP: 0010:[<ffffffff839fa089>] 
c [<ffffffff839fa089>] arch_local_irq_disable arch/x86/include/asm/paravirt.h:773 [inline]
RIP: 0010:[<ffffffff839fa089>] 
c [<ffffffff839fa089>] arch_local_irq_save arch/x86/include/asm/paravirt.h:786 [inline]
RIP: 0010:[<ffffffff839fa089>] 
c [<ffffffff839fa089>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
RIP: 0010:[<ffffffff839fa089>] 
c [<ffffffff839fa089>] _raw_spin_lock_irqsave+0x19/0x62 kernel/locking/spinlock.c:159
RSP: 0018:ffff88019a777388  EFLAGS: 00000096
RAX: 0000000000000296 RBX: ffff8801a86b59e8 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: ffff88019a7774a8 RDI: ffff8801a86b59e8
RBP: ffff88019a7773a0 R08: ffff880198025110 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000296
R13: ffff88019a7774a8 R14: ffff8801a86b59e8 R15: 0000000000000001
FS:  00007fd16ea27700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe78cf38140 CR3: 00000001c5bf9000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000246
c 1ffff100334eee79
c ffff88019a777428
c ffff88019a777450
c
 ffffffff812215bb
c ffff88019a7773d8
c 0000000000000246
c ffff880198024800
c
 0000000041b58ab3
c ffffffff843bbae3
c ffffffff81221550
c 0000000000000246
c
Call Trace:
 [<ffffffff812215bb>] prepare_to_wait_event+0x6b/0x450 kernel/sched/wait.c:213
 [<ffffffff81907bbe>] request_wait_answer+0x22e/0x6e0 fs/fuse/dev.c:459
 [<ffffffff819086c9>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:480
 [<ffffffff819087cd>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:493
 [<ffffffff81912a24>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:551
 [<ffffffff8191adc3>] fuse_lookup_name+0x253/0x5d0 fs/fuse/dir.c:369
 [<ffffffff8191b22d>] fuse_lookup+0xed/0x3a0 fs/fuse/dir.c:406
 [<ffffffff81594dae>] lookup_slow+0x23e/0x470 fs/namei.c:1668
 [<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
 [<ffffffff815e5164>] user_path include/linux/namei.h:60 [inline]
 [<ffffffff815e5164>] do_mount+0x134/0x2740 fs/namespace.c:2780
 [<ffffffff815e814e>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e814e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fa193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c<66> 
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c