------------[ cut here ]------------
kernel BUG at fs/buffer.c:3060!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 13380 Comm: syz-executor0 Not tainted 4.9.105-g61aafb6 #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d8650000 task.stack: ffff8801b83b0000
RIP: 0010:[<ffffffff81627f24>]  [<ffffffff81627f24>] submit_bh_wbc.isra.46+0x3e4/0x590 fs/buffer.c:3060
RSP: 0000:ffff8801b83b76d8  EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff8801be6ec690 RCX: ffffc900075a5000
RDX: 0000000000009ed2 RSI: ffffffff81627f24 RDI: 0000000000000000
RBP: ffff8801b83b7718 R08: ffff8801d86508e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000050
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fbc45ffd700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2aa3282f46 CR3: 00000001cf655000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801b83b7718 ffffffff811bb625 ffff8801d61a0b80 ffff8801be6ec690
 0000000000000050 0000000000000200 0000000000000008 ffff8801d94b8000
 ffff8801b83b7748 ffffffff81629019 ffff8801d94b8000 ffff8801d94b8018
Call Trace:
 [<ffffffff81629019>] submit_bh fs/buffer.c:3114 [inline]
 [<ffffffff81629019>] __bread_slow fs/buffer.c:1228 [inline]
 [<ffffffff81629019>] __bread_gfp+0xf9/0x270 fs/buffer.c:1423
 [<ffffffff818b7178>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b7178>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818b9e01>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818b9e01>] fat_get_short_entry+0x131/0x2a0 fs/fat/dir.c:876
 [<ffffffff818c1d67>] fat_subdirs+0xc7/0x190 fs/fat/dir.c:942
 [<ffffffff818d2079>] fat_read_root fs/fat/inode.c:1402 [inline]
 [<ffffffff818d2079>] fat_fill_super+0x1cf9/0x3550 fs/fat/inode.c:1832
 [<ffffffff818d8e31>] vfat_fill_super+0x31/0x40 fs/fat/namei_vfat.c:1070
 [<ffffffff8157c797>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff818d8df4>] vfat_mount+0x34/0x40 fs/fat/namei_vfat.c:1077
 [<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: c3 e8 b1 6f d3 ff 41 83 fe 01 0f 85 f0 fc ff ff e8 a2 6f d3 ff f0 80 63 01 f7 e9 e1 fc ff ff e8 93 6f d3 ff 0f 0b e8 8c 6f d3 ff <0f> 0b e8 85 6f d3 ff 0f 0b e8 7e 6f d3 ff 0f 0b e8 77 6f d3 ff 
RIP  [<ffffffff81627f24>] submit_bh_wbc.isra.46+0x3e4/0x590 fs/buffer.c:3060
 RSP <ffff8801b83b76d8>
---[ end trace 0b5c554c371b53ab ]---