attempt to access beyond end of device
loop0: rw=0, want=18442984958116442986, limit=264192
INFO: task syz-executor0:17805 blocked for more than 140 seconds.
      Not tainted 4.9.123-g520d10d3 #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D26792 17805      1 0x00000004
 ffff8801ab494800 0000000000000000 ffff8801d4975500 ffff8801d9a6b000
 ffff8801db321c18 ffff8801aa3af4e0 ffffffff839f0ebd ffffffff81237907
 0000000000000000 ffff8801ab4950c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839f24bf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839fc8e4>] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81eed978>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff839fb812>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff839fb812>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<ffffffff815994e1>] inode_lock_shared include/linux/fs.h:776 [inline]
 [<ffffffff815994e1>] lookup_slow+0x141/0x470 fs/namei.c:1645
 [<ffffffff815a5b66>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a7889>] link_path_walk+0x889/0x1200 fs/namei.c:2120
 [<ffffffff815a88fd>] path_openat+0x1ad/0x3590 fs/namei.c:3533
 [<ffffffff815affa7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8157277d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff81572a5d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff81572a5d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a01d93>] 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: [<ffffffff81368a9c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81368a9c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81428308>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3762:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fff62>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff821253c2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/17805:
 #0:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff815994e1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff815994e1>] lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor0/26912:
 #0:  (sb_writers#17){.+.+.+}, at: [<ffffffff815e516f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#17){.+.+.+}, at: [<ffffffff815e516f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff815a9625>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff815a9625>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff815a9625>] path_openat+0xed5/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.123-g520d10d3 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d84bfd08 ffffffff81eb9689 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9fa0 ffff8801d84bfd40
 ffffffff81ec49c7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb9689>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb9689>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ec49c7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ec495a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810ba0a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81369034>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81369034>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81369034>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81369034>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a01f5c>] 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: 26861 Comm: syz-executor0 Not tainted 4.9.123-g520d10d3 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801a4b04800 task.stack: ffff8801da398000
RIP: 0010:[<ffffffff81360dd0>] 
c [<ffffffff81360dd0>] check_kcov_mode kernel/kcov.c:66 [inline]
RIP: 0010:[<ffffffff81360dd0>] 
c [<ffffffff81360dd0>] __sanitizer_cov_trace_pc+0x20/0x50 kernel/kcov.c:100
RSP: 0018:ffff8801da39f258  EFLAGS: 00000046
RAX: ffff8801a4b04800 RBX: 0000000000000004 RCX: ffffc9000011f000
RDX: 0000000000000000 RSI: ffffffff81628ba6 RDI: ffff8801b92476a8
RBP: ffff8801da39f258 R08: ffff8801a4b05160 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10034960a27 R12: ffff8801b9247690
R13: dffffc0000000000 R14: ffff8801b9247690 R15: 0000000000000003
FS:  00007f8fe835a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c423019000 CR3: 00000001cd471000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801da39f2a8
c ffffffff81628ba6
c 0000020006f080c0
c 0000000000000041
c
 ffff8801d5e605c0
c 0000000000000001
c ffffea0006f080dc
c ffffea0006f080c0
c
 0000000000000200
c dffffc0000000000
c ffff8801da39f348
c ffffffff81629b89
c
Call Trace:
 [<ffffffff81628ba6>] lookup_bh_lru fs/buffer.c:1327 [inline]
 [<ffffffff81628ba6>] __find_get_block+0x66/0x4c0 fs/buffer.c:1356
 [<ffffffff81629b89>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff81629b89>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff8162d52d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818bc718>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818bc718>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818c4517>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818c4517>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818dea84>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818df261>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff8159f9dd>] lookup_open+0x63d/0x1930 fs/namei.c:3203
 [<ffffffff815a9648>] do_last fs/namei.c:3315 [inline]
 [<ffffffff815a9648>] path_openat+0xef8/0x3590 fs/namei.c:3534
 [<ffffffff815affa7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8157277d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff81572aa0>] SYSC_openat fs/open.c:1099 [inline]
 [<ffffffff81572aa0>] SyS_openat+0x30/0x40 fs/open.c:1093
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a01d93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c