[Bug 42723] EXT4-fs error: ext4_mb_generate_buddy

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42723


Robert Trace <bugzilla-kernel@farcaster.org> changed:

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--- Comment #3 from Robert Trace <bugzilla-kernel@farcaster.org>  2012-04-16 00:21:40 ---
I have a filesystem that exhibits the problem in the original mailing-list
post:

EXT4-fs (dm-3): mounted filesystem with ordered data mode. Opts: (null)
  <copy data into the filesystem>
EXT4-fs error (device dm-3): ext4_mb_generate_buddy:738: group 186, 32764
blocks in bitmap, 32766 in gd
Aborting journal on device dm-3-8.
EXT4-fs (dm-3): Remounting filesystem read-only
EXT4-fs (dm-3): ext4_da_writepages: jbd2_start: 9223372036854775807 pages, ino
452; err -30

fsck'ing the filesystem will repair it.  Performing the exact same copy again
will reproduce the exact error.

I can reproduce this 100% of the time and have bisected it back to 

commit d5b8f31007a93777cfb0603b665858fb7aebebfc
Author: Theodore Ts'o <tytso@mit.edu>
Date:   Fri Sep 9 18:44:51 2011 -0400

    ext4: bigalloc changes to block bitmap initialization functions

    Add bigalloc support to ext4_init_block_bitmap() and
    ext4_free_blocks_after_init().

It's still present in Linus' tree as of
a9e1e53bcfb29b3b503a5e75ce498d9a64f32c1e (10-Apr).

I'm more than happy to help out with more information or testing patches since
I've got it 100% reproducible.

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