FAT-fs (loop4): Can't find a valid FAT filesystem
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
FAT-fs (loop2): Unrecognized mount option "Yfh!OÊû“4°Jœ\‚5ÁZ¹Ý™>gY.±v9¯a!Ñ€0°
¢dZ£îºÏÁ*O2^Å®" or missing value
FAT-fs (loop4): bogus number of reserved sectors
FAT-fs (loop4): Can't find a valid FAT filesystem
INFO: task syz-executor1:7828 blocked for more than 140 seconds.
      Not tainted 4.9.113-g47bbcd6 #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D28296  7828   3880 0x00000004
 ffff88019bd11800 ffff8801cedbea00 ffff8801c96ca4c0 ffff8801b8ad6000
 ffff8801db321c18 ffff8801c0dd7660 ffffffff839e909d 1ffff100337a2422
 0000000000000000 ffff88019bd120f0 00ff88019bd120c0 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea69f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff815c7d52>] d_wait_lookup fs/dcache.c:2455 [inline]
 [<ffffffff815c7d52>] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537
 [<ffffffff81594d0c>] lookup_slow+0x19c/0x470 fs/namei.c:1650
 [<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
 [<ffffffff8161bdbf>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff8161bdbf>] do_utimes+0x17f/0x2c0 fs/utimes.c:155
 [<ffffffff8161c49d>] SYSC_futimesat fs/utimes.c:214 [inline]
 [<ffffffff8161c49d>] SyS_futimesat fs/utimes.c:189 [inline]
 [<ffffffff8161c49d>] SYSC_utimes fs/utimes.c:220 [inline]
 [<ffffffff8161c49d>] SyS_utimes+0x13d/0x1b0 fs/utimes.c:217
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f93>] 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
1 lock held by rsyslogd/3673:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3769:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8142>] 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
1 lock held by syz-executor1/7801:
 #0:  (&sb->s_type->i_mutex_key#20){.+.+.+}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#20){.+.+.+}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor1/7828:
 #0:  (&sb->s_type->i_mutex_key#20){.+.+.+}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#20){.+.+.+}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8467d08 ffffffff81eb32a9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d8467d40
 ffffffff81ebe5a7 0000000000000001 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
 [<ffffffff839fa15c>] 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: 0 Comm: swapper/0 Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84629800 task.stack: ffffffff84600000
RIP: 0010:[<ffffffff810c312c>] 
c [<ffffffff810c312c>] native_apic_mem_write+0xc/0x10 arch/x86/include/asm/apic.h:98
RSP: 0018:ffff8801db207dc8  EFLAGS: 00000046
RAX: ffffffff810c3120 RBX: ffffffff84434860 RCX: 0000000000000020
RDX: 1ffffffff0886929 RSI: 0000000000098370 RDI: 0000000000000380
RBP: ffff8801db207dc8 R08: ffff88021fffd018 R09: 0000000000000006
R10: ffffed0043fffa01 R11: 0000000000000001 R12: 0000000000098370
R13: 1ffff1003b640fc0 R14: 0000000000000003 R15: ffff8801db207e60
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f232f532048 CR3: 00000001ca3f8000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db207de8
c ffffffff810b18f0
c 0000000000000003
c ffff8801db2180c0
c
 ffff8801db207e88
c ffffffff812c6ec4
c 00000000db207eb0
c 0000000041b58ab3
c
 ffffffff843bf9f0
c ffffffff812c6c10
c ffff8801db21c960
c 000000426148c300
c
Call Trace:
 <IRQ> 
d [<ffffffff810b18f0>] apic_write arch/x86/include/asm/apic.h:398 [inline]
 <IRQ> 
d [<ffffffff810b18f0>] lapic_next_event+0x60/0x90 arch/x86/kernel/apic/apic.c:468
 [<ffffffff812c6ec4>] clockevents_program_event+0x2b4/0x3e0 kernel/time/clockevents.c:339
 [<ffffffff812cbbe4>] tick_program_event+0x104/0x190 kernel/time/tick-oneshot.c:47
 [<ffffffff812a5ce1>] hrtimer_interrupt+0x1e1/0x430 kernel/time/hrtimer.c:1366
 [<ffffffff810b2384>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839ff75c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839fb8f0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff839f8ba6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f81e5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f81e5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:437
 [<ffffffff8106ae00>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428
 [<ffffffff839f9005>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff812231d5>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff812231d5>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff812231d5>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff839e5e6c>] rest_init+0x183/0x189 init/main.c:409
 [<ffffffff84c97943>] start_kernel+0x67e/0x6b2 init/main.c:664
 [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:177
Code: 
c00 
c0f 
c1f 
c40 
c00 
c66 
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c84 
c00 
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c55 
cbe 
c01 
c00 
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c48 
c89 
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c22 
c1b 
c00 
c5d 
cc3 
c55 
c89 
cff 
c48 
c89 
ce5 
c89 
cb7 
c00 
cc0 
c5f 
cff 
c<5d> 
cc3 
c66 
c90 
c48 
cb8 
c00 
c00 
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cfc 
cff 
cdf 
c55 
c48 
c89 
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c53 
c89 
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c