FAT-fs (loop2): error, fat_free_clusters: deleting FAT entry beyond EOF
FAT-fs (loop2): Filesystem has been set read-only
IPVS: stopping master sync thread 8735 ...
INFO: task syz-executor3:11263 blocked for more than 120 seconds.
      Not tainted 4.9.105-gd7e64f8 #40
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D26288 11263   3896 0x00000004
 ffff8801d3ac6000 ffff8801bbd70540 ffff8801be08af40 ffff8801bd20e000
 ffff8801db321c18 ffff88018edd7c10 ffffffff839e8c1d ffffffff81235b37
 0000000000000000 ffff8801d3ac68c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea21f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f4644>] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81ee8458>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff839f3572>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff839f3572>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<ffffffff8157d021>] iterate_supers+0xe1/0x260 fs/super.c:591
 [<ffffffff8161b062>] sys_sync+0xa2/0x170 fs/sync.c:112
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] 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: [<ffffffff81366b9c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b9c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426180>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3772:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cc2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82120062>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor3/11263:
 #0:  (&type->s_umount_key#56){.+.+..}, at: [<ffffffff8157d021>] iterate_supers+0xe1/0x260 fs/super.c:591

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.105-gd7e64f8 #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d872fd08 ffffffff81eb41a9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b96a0 ffff8801d872fd40
 ffffffff81ebf4a7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf4a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf43a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b97a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81367134>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81367134>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367134>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367134>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] 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: 11261 Comm: syz-executor0 Not tainted 4.9.105-gd7e64f8 #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801bfaa8000 task.stack: ffff88018edc0000
RIP: 0010:[<ffffffff81235b66>] 
c [<ffffffff81235b66>] mark_held_locks+0xf6/0x130 kernel/locking/lockdep.c:2665
RSP: 0018:ffff88018edc7870  EFLAGS: 00000086
RAX: 0000000000000001 RBX: ffff8801bfaa8000 RCX: 1ffff10037f5511d
RDX: 1ffffffff0ac4ff0 RSI: ffff8801bfaa88c8 RDI: ffffffff85627f80
RBP: ffff88018edc7870 R08: ffff8801bfaa88e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff816246e3
R13: dffffc0000000000 R14: ffff8801b9186bd0 R15: 000000000000000f
FS:  00007f8e091aa700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c42eaff000 CR3: 00000001c2d5f000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff88018edc7890
c ffffffff81235f2b
c 0000000000000010
c 0000000000000000
c
 ffff88018edc78a0
c ffffffff8123613d
c ffff88018edc78f0
c ffffffff816246e3
c
 00000400064f4bc0
c 0000000000000066
c ffff8801d9c15080
c 0000000000000001
c
Call Trace:
 [<ffffffff81235f2b>] __trace_hardirqs_on_caller kernel/locking/lockdep.c:2689 [inline]
 [<ffffffff81235f2b>] trace_hardirqs_on_caller+0x38b/0x590 kernel/locking/lockdep.c:2736
 [<ffffffff8123613d>] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
 [<ffffffff816246e3>] lookup_bh_lru fs/buffer.c:1344 [inline]
 [<ffffffff816246e3>] __find_get_block+0x183/0x4c0 fs/buffer.c:1356
 [<ffffffff816255a9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff816255a9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628f4d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818e7646>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818e7646>] isofs_fill_super+0x8a6/0x2480 fs/isofs/inode.c:617
 [<ffffffff8157c797>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff818e3854>] isofs_mount+0x34/0x40 fs/isofs/inode.c:1509
 [<ffffffff8157e51c>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815ddce1>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e5609>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e5609>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e5609>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff815e835e>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e835e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c18 
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c41 
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c<5d> 
cc3 
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c89 
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cd4 
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c30 
c00 
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c34 
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cff 
c