IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
FAT-fs (loop0): error, invalid access to FAT (entry 0x000006c0)
FAT-fs (loop0): Filesystem has been set read-only
INFO: task syz-executor5:28674 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-executor5   D28504 28674   3877 0x00000004
 ffff8801a2ad3000 ffff8801cfe81a40 ffff8801cfe81a40 ffff8801a8816000
 ffff8801db221c18 ffff8801c6c97690 ffffffff839e929d ffffffff81235647
 0000000000000000 ffff8801a2ad38c0 0000000600000007 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea89f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f4cc4>] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81ee7558>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff839f3bf2>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff839f3bf2>] 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
 [<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
 [<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 getty/3777:
 #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
1 lock held by syz-executor5/28588:
 #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-executor5/28674:
 #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-executor5/28688:
 #0:  (&sb->s_type->i_mutex_key#20){++++++}, at: [<ffffffff815e18ac>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#20){++++++}, at: [<ffffffff815e18ac>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077

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

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
 ffff8801d852fd08 ffffffff81eb32a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d852fd40
 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: 0 Comm: swapper/1 Not tainted 4.9.113-g9905591 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a6b000 task.stack: ffff8801d9a80000
RIP: 0010:[<ffffffff8135ea71>] 
c [<ffffffff8135ea71>] __sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:93
RSP: 0018:ffff8801db307eb8  EFLAGS: 00000002
RAX: 0000000000000007 RBX: ffff8801db31cf00 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff8801db31cf74 RDI: ffff8801db31cfe0
RBP: ffff8801db307f98 R08: ffff8801d9a6b8e8 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 00000085287e0d80
R13: 00000085287e0d80 R14: 00000085287e0d80 R15: 7fffffffffffffff
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f749dcc0000 CR3: 00000001cd921000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db307f98
c ffffffff812cda58
c ffffffff812ce384
c ffff8801d9a6b8c0
c
 ffff8801db31cfc8
c ffff8801db31cf74
c ffff8801db31cf60
c ffff8801db3180c0
c
 1ffff1003b660fe2
c 0000000100000001
c 000000852467677d
c 0000000041b58ab3
c
Call Trace:
 [<ffffffff812ce384>] tick_nohz_irq_exit+0x84/0xb0 kernel/time/tick-sched.c:995
 [<ffffffff8114b291>] tick_irq_exit kernel/softirq.c:386 [inline]
 [<ffffffff8114b291>] irq_exit+0x151/0x190 kernel/softirq.c:407
 [<ffffffff839fe921>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff839fc490>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f8da6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f83e5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f83e5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:437
 [<ffffffff8106ae00>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428
 [<ffffffff839f9205>] 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
 [<ffffffff810aefa8>] start_secondary+0x328/0x400 arch/x86/kernel/smpboot.c:257
Code: 
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c00 
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c<48> 
c89 
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c04 
c25 
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c