FAT-fs (loop4): bogus number of reserved sectors
FAT-fs (loop1): bogus number of reserved sectors
FAT-fs (loop1): Can't find a valid FAT filesystem
FAT-fs (loop4): Can't find a valid FAT filesystem
------------[ cut here ]------------
kernel BUG at fs/buffer.c:3111!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
kobject: 'loop3' (ffff8880a4136e60): kobject_uevent_env
CPU: 0 PID: 12381 Comm: syz-executor.0 Not tainted 4.14.159-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888078aa04c0 task.stack: ffff88807c980000
RIP: 0010:submit_bh_wbc+0x5a0/0x720 fs/buffer.c:3111
RSP: 0018:ffff88807c987a78 EFLAGS: 00010297
kobject: 'loop3' (ffff8880a4136e60): fill_kobj_path: path = '/devices/virtual/block/loop3'
RAX: ffff888078aa04c0 RBX: ffff88809487ddc8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807c987ac0 R08: 0000000000000000 R09: ffff888078aa0d60
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809487ddc8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f174f68b700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
FAT-fs (loop3): bogus number of reserved sectors
CR2: 00007f5d5cbeef44 CR3: 00000000a06a9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bh fs/buffer.c:3158 [inline]
 __bread_slow fs/buffer.c:1238 [inline]
 __bread_gfp+0x106/0x290 fs/buffer.c:1420
FAT-fs (loop3): Can't find a valid FAT filesystem
 sb_bread include/linux/buffer_head.h:307 [inline]
 fat_fill_super+0x303/0x3560 fs/fat/inode.c:1634
 vfat_fill_super+0x32/0x40 fs/fat/namei_vfat.c:1059
 mount_bdev+0x2be/0x370 fs/super.c:1134
 vfat_mount+0x35/0x40 fs/fat/namei_vfat.c:1066
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45d36a
RSP: 002b:00007f174f68aa68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 000000000045d36a
RDX: 00007f174f68aae0 RSI: 00000000200004c0 RDI: 00007f174f68ab00
RBP: 000000000075bf20 R08: 00007f174f68ab40 R09: 00007f174f68aae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f174f68b6d4
R13: 00000000004cae58 R14: 00000000004e4478 R15: 00000000ffffffff
Code: f0 80 63 01 f7 e9 3d fb ff ff 48 8d 43 20 48 89 45 d0 48 8d 43 10 48 89 45 c0 e9 34 fc ff ff e8 87 3a c1 ff 0f 0b e8 80 3a c1 ff <0f> 0b e8 79 3a c1 ff 0f 0b e8 72 3a c1 ff 0f 0b e8 6b 3a c1 ff 
RIP: submit_bh_wbc+0x5a0/0x720 fs/buffer.c:3111 RSP: ffff88807c987a78
---[ end trace 28efdfe3662a9b25 ]---