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SubjectRe: Apparent serious progressive ext4 data corruption bug in 3.6.3 (and other stable branches?)
On 10/27/12 7:45 AM, Nix wrote:
> [nfs people purged from Cc]
>
> On 27 Oct 2012, Theodore Ts'o verbalised:
>
>> Huh? It's not turned on by default. If you mount with no mount
>> options, journal checksums are *not* turned on.
>
> ?! it's turned on for me, and though I use weird mount options I don't
> use that one:

journal_async_commit implies journal_checksum:

{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},

journal_checksum seems to have broken, at least for me, between 3.3 & 3.4, I think I've narrowed down the commit but not sure yet what the flaw is, will investigate & report back later. Busy Saturday.

So anyway, turning on journal_async_commit (notionally unsafe) enables journal_checksum (apparently broken).

-Eric

> /dev/main/var /var ext4 defaults,nobarrier,usrquota,grpquota,nosuid,nodev,relatime,journal_async_commit,commit=30,user_xattr,acl 1 2
> Default mount options: (none)
> /dev/mapper/main-var /var ext4 rw,nosuid,nodev,relatime,journal_checksum,journal_async_commit,nobarrier,quota,usrquota,grpquota,commit=30,stripe=16,data=ordered,usrquota,grpquota 0 0
>
> ...
>
> Ah! it's turned on by journal_async_commit. OK, that alone argues
> against use of journal_async_commit, tested or not, and I'd not have
> turned it on if I'd noticed that.
>
> (So, the combinations I'll be trying for effect on this bug are:
>
> journal_async_commit (as now)
> journal_checksum
> none
>
> Technically to investigate all possibilities we should try
> journal_async_commit,no_journal_checksum, but this seems so unlikely to
> have ever been tested by anyone that it's not worth looking into...)
>



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