FAT-fs (loop7): bogus number of reserved sectors
BFS-fs: bfs_fill_super(): loop5 is unclean, continuing
WARNING: CPU: 1 PID: 18989 at mm/slab_common.c:1012 kmalloc_slab+0x5d/0x70 mm/slab_common.c:1012
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 18989 Comm: syz-executor5 Not tainted 4.16.0-rc7+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FAT-fs (loop7): Can't find a valid FAT filesystem
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x1f4/0x2b0 lib/bug.c:186
 fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:kmalloc_slab+0x5d/0x70 mm/slab_common.c:1012
RSP: 0018:ffff880184967908 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801c3c4d004 RCX: ffffffff820931da
RDX: 1ffff10035e0a3e4 RSI: 0000000000000000 RDI: 0000000000800000
RBP: ffff880184967908 R08: 1ffff1003092ceb0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000007fffff
R13: ffff8801c3c4d000 R14: 00000000014080c0 R15: ffff8801be4107c0
 __do_kmalloc mm/slab.c:3701 [inline]
 __kmalloc+0x25/0x760 mm/slab.c:3715
 kmalloc include/linux/slab.h:517 [inline]
 kzalloc include/linux/slab.h:701 [inline]
 bfs_fill_super+0x3d3/0xea0 fs/bfs/inode.c:362
 mount_bdev+0x2b7/0x370 fs/super.c:1119
 bfs_mount+0x34/0x40 fs/bfs/inode.c:465
 mount_fs+0x66/0x2d0 fs/super.c:1222
 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:2509 [inline]
 do_new_mount fs/namespace.c:2512 [inline]
 do_mount+0xea4/0x2bb0 fs/namespace.c:2842
 SYSC_mount fs/namespace.c:3058 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3035
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4578aa
RSP: 002b:00007fc57b587bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 00000000004578aa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fc57b587c00
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000020000000
R10: 00000000c0ed0000 R11: 0000000000000246 R12: 0000000000000014
R13: 0000000000000662 R14: 00000000006fb9d0 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..