linux-ext4 - inode/block bitmap checksum error

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Date:   Thu, 27 Sep 2018 18:54:02 +0530
From:   Vignesh Raman <vignesh.raman.in@...il.com>
To:     linux-ext4@...r.kernel.org
Subject: inode/block bitmap checksum error

Hi All,

We are seeing the below ext4 corruption messages when running linux
4.9 on debian,
[   13.694043] EXT4-fs error (device sda4):
ext4_validate_block_bitmap:384: comm plymouthd: bg 6: bad block bitmap
checksum
[   13.694359] EXT4-fs error (device sda4) in ext4_free_blocks:4916:
Filesystem failed CRC
[   13.694807] EXT4-fs error (device sda4):
ext4_validate_inode_bitmap:96: comm plymouthd: Corrupt inode bitmap -
block_group = 1, inode_bitmap = 331
[   13.695025] EXT4-fs error (device sda4) in ext4_free_inode:358:
Filesystem failed CRC
[   13.696127] EXT4-fs error (device sda4):
ext4_validate_block_bitmap:384: comm plymouthd: bg 7: bad block bitmap
checksum
[   13.715278] EXT4-fs error (device sda4):
ext4_validate_block_bitmap:384: comm systemd-tmpfile: bg 16: bad block
bitmap checksum
[   13.715736] EXT4-fs error (device sda4) in ext4_free_blocks:4916:
Filesystem failed CRC
[   13.716358] EXT4-fs error (device sda4):
ext4_validate_inode_bitmap:96: comm systemd-tmpfile: Corrupt inode
bitmap - block_group = 16, inode_bitmap = 524292
[   13.716639] EXT4-fs error (device sda4) in ext4_free_inode:358:
Filesystem failed CRC
[   13.717477] EXT4-fs error (device sda4) in ext4_free_inode:358:
Corrupt filesystem

fsck shows the below error,
systemd-fsck[193]: fsck failed with exit status 8.
systemd-fsck[193]: Ignoring error.
systemd-fsck[193]: fsck.ext4: Superblock checksum does not match
superblock while trying to open /dev/sda4
systemd-fsck[193]: /dev/sda4:
systemd-fsck[193]: The superblock could not be read or does not
describe a valid ext2/ext3/ext4
systemd-fsck[193]: filesystem.  If the device is valid and it really
contains an ext2/ext3/ext4
systemd-fsck[193]: filesystem (and not swap or ufs or something else),
then the superblock
systemd-fsck[193]: is corrupt, and you might try running e2fsck with
an alternate superblock:
systemd-fsck[193]:     e2fsck -b 8193 <device>
systemd-fsck[193]:  or
systemd-fsck[193]:     e2fsck -b 32768 <device>

Would the fsck failure cause the inode/block bitmap checksum issue?

Kernel version: [    0.000000] Linux version 4.9.0-8-amd64
(debian-kernel@...ts.debian.org) (gcc version 6.3.0 20170516 (Debian
6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.110-3+deb9u4 (2018-08-21)

Backported the below patch, but the issue was still seen.
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8d5a803c6a6ce4ec258e31f76059ea5153ba46ef

Any pointers will be helpful. Thanks.

Regards,
Vignesh