Mount fails for EXT4 filesystem with error message "group descriptors corrupted!"

This document (7023462) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 12 Service Pack 3 (SLES 12 SP3)

Situation

When mounting a EXT4 filesystem, it fails with the following type of error messages:
For example:
 Sep 12 12:15:35 servername mount[3417]: mount: mount /dev/mapper/vg1-lv1 on /usr/dir1 failed: Structure needs cleaning
 Sep 12 12:15:35 servername kernel: EXT4-fs (dm-10): ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors
 Sep 12 12:15:35 servername kernel: EXT4-fs (dm-10): group descriptors corrupted!
 
However, running fsck to check this EXT4 filesystem does not complain of any error.
 
 

Resolution

This bug is fixed in the kernel version 4.4.155-94.50.1 or higher.

Cause

This error is due to a bug in the EXT4 filesystem introduced in kernel version 4.4.140-94.42.1.

Additional Information

The dumpe2fs output shows that "meta_bg" Filesystem feature is enabled.
For example:
# dumpe2fs /dev/mapper/vg1-lv1
...
Filesystem features:      has_journal ext_attr dir_index filetype meta_bg extent flex_bg sparse_super huge_file uninit_bg dir_nlink extra_isize
 

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7023462
  • Creation Date: 22-Oct-2018
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

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