While attempting to expand a 1.64T ext4 volume to 2.18T the F9 kernel
deadlocked. (I have photo of screen/oops if anybody's interested.)


Now after recovery, the filesystem won't mount

EXT4-fs: ext4_check_descriptors: Block bitmap for group 13413 not in
group (block 0)!<3>EXT4-fs: group descriptors corrupted!


and fsck won't run:

fsck.ext4: Group descriptors look bad... trying backup blocks...
inst: recovering journal
fsck.ext4: unable to set superblock flags on inst

I peeked at all backup superblocks, but they all appear the same--the
larger/newer 2.18T geometry. :-(


What is the best way to recover? I know exactly how the original
filesystem was created. Is there a way to just replay the old superblocks
and trick it into thinking it never resized?


../C

dumpe2fs 1.41.0 (10-Jul-2008)
Filesystem volume name: inst
Last mounted on: <not available>
Filesystem UUID: ddabbf0c-bf3f-495a-9777-e832cc14e9df
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent sparse_super large_file
Filesystem flags: signed_directory_hash test_filesystem
Default mount options: journal_data_writeback
Filesystem state: clean
Errors behavior: Remount read-only
Filesystem OS type: Linux
Inode count: 9080832
Block count: 581173248
Reserved block count: 5808792
Free blocks: 6282771
Free inodes: 4331111
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 885
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 512
Inode blocks per group: 16
RAID stride: 32
RAID stripe width: 64
Filesystem created: Sun Jul 27 21:02:11 2008
Last mount time: Wed Aug 13 18:28:35 2008
Last write time: Sat Oct 18 12:39:13 2008
Mount count: 2
Maximum mount count: -1
Last checked: Sun Jul 27 21:02:11 2008
Check interval: 0 (<none>)
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
Default directory hash: tea
Directory Hash Seed: c6e2cfa3-0545-46a4-8240-ccb987191b88
Journal backup: inode blocks
Journal size: 256M

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On Sat, Oct 18, 2008 at 12:55:56PM -0700, Curtis Doty wrote:
> While attempting to expand a 1.64T ext4 volume to 2.18T the F9 kernel
> deadlocked. (I have photo of screen/oops if anybody's interested.)

Yes, that would be useful, thanks.

> Now after recovery, the filesystem won't mount
>
> EXT4-fs: ext4_check_descriptors: Block bitmap for group 13413 not in
> group (block 0)!<3>EXT4-fs: group descriptors corrupted!
>
> and fsck won't run:
>
> fsck.ext4: Group descriptors look bad... trying backup blocks...
> inst: recovering journal
> fsck.ext4: unable to set superblock flags on inst

Hmm... This sounds like the needs recovery flag was set on the backup
superblock, which should never happen. Before we try something more
extreme, see if this helps you:

e2fsck -b 32768 -B 4096 /dev/where-inst-is-located

That forces the use of the backup superblock right away, and might
help you get past the initial error.

- Ted

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