syzbot

EXT4-fs warning (device loop0): ext4_update_dynamic_rev:864: updating to rev 1 because of new feature flag, running e2fsck is recommended
EXT4-fs error (device loop0): ext4_validate_block_bitmap:409: comm syz-executor242: bg 0: block 46: invalid block bitmap
Kernel panic - not syncing: EXT4-fs (device loop0): panic forced after error
CPU: 0 PID: 375 Comm: syz-executor242 Not tainted 5.4.249-syzkaller-00009-gfed9191809bc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 panic+0x309/0x896 kernel/panic.c:285
 ext4_handle_error+0x3c2/0x3d0 fs/ext4/super.c:486
 __ext4_error+0x1f9/0x490 fs/ext4/super.c:515
 ext4_validate_block_bitmap+0xa8c/0xcd0 fs/ext4/balloc.c:408
 ext4_read_block_bitmap+0x3a/0x80 fs/ext4/balloc.c:563
 ext4_free_blocks+0x960/0x2310 fs/ext4/mballoc.c:4869
 ext4_remove_blocks fs/ext4/extents.c:2726 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2879 [inline]
 ext4_ext_remove_space+0x2758/0x4ba0 fs/ext4/extents.c:3124
 ext4_truncate+0xb23/0x1290 fs/ext4/inode.c:4651
 ext4_orphan_cleanup+0x8bc/0xd40 fs/ext4/super.c:2808
 ext4_fill_super+0x8576/0x8d70 fs/ext4/super.c:4715
 mount_bdev+0x267/0x370 fs/super.c:1417
 legacy_get_tree+0xdf/0x170 fs/fs_context.c:647
 vfs_get_tree+0x85/0x260 fs/super.c:1547
 do_new_mount+0x292/0x570 fs/namespace.c:2843
 do_mount+0x688/0xe10 fs/namespace.c:3163
 ksys_mount+0xc2/0xf0 fs/namespace.c:3372
 __do_sys_mount fs/namespace.c:3386 [inline]
 __se_sys_mount fs/namespace.c:3383 [inline]
 __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3383
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Kernel Offset: disabled
Rebooting in 86400 seconds..