EXT2-fs (loop0): error: ext2_check_descriptors: Block bitmap for group 0 not in group (block 0)!
Kernel panic - not syncing: EXT2-fs: panic from previous error

CPU: 1 PID: 15774 Comm: syz-executor0 Not tainted 4.9.105-gd7e64f8 #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d516f918 ffffffff81eb41a9 ffffffff83d0a940 00000000ffffffff
 ffff8801d4a41100 0000000000000001 ffffffff83d0b740 ffff8801d516f9d8
 ffffffff81421e15 0000000041b58ab3 ffffffff843b9990 ffffffff81421c56
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81421e15>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81cbd22d>] ext2_error.cold.10+0xc2/0x166 fs/ext2/super.c:74
 [<ffffffff8187baee>] ext2_check_descriptors fs/ext2/super.c:689 [inline]
 [<ffffffff8187baee>] ext2_fill_super+0x263e/0x2c90 fs/ext2/super.c:1066
 [<ffffffff8157c797>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff818758d4>] ext2_mount+0x34/0x40 fs/ext2/super.c:1445
 [<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
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..