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On 09/15/2014, 04:46 AM, Ben Hutchings wrote:
> On Wed, 2014-09-03 at 11:26 +0200, Jiri Slaby wrote:
>> From: Theodore Ts'o <tytso@xxxxxxx>
>>
>> 3.12-stable review patch. If anyone has any objections, please
>> let me know.
>>
>> ===============
>>
>> commit 86f0afd463215fc3e58020493482faa4ac3a4d69 upstream.
>>
>> If there is a failure while allocating the preallocation
>> structure, a number of blocks can end up getting marked in the
>> in-memory buddy bitmap, and then not getting released. This can
>> result in the following corruption getting reported by the
>> kernel:
>>
>> EXT4-fs error (device sda3): ext4_mb_generate_buddy:758: group
>> 1126, 12793 clusters in bitmap, 12729 in gd
>>
>> In that case, we need to release the blocks using
>> mb_free_blocks().
>>
>> Tested: fs smoke test; also demonstrated that with injected
>> errors, the file system is no longer getting corrupted
>>
>> Google-Bug-Id: 16657874
>>
>> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx> Signed-off-by:
>> Jiri Slaby <jslaby@xxxxxxx>
> [...]
>
> It's a bit late now, but Ted said this introduced a regression
> that's fixed by commit c99d1e6e83b0 ("ext4: fix BUG_ON in
> mb_free_blocks()").
Oh, now queued for 3.12. Thanks!
- --
js
suse labs
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