https://bugzilla.wikimedia.org/show_bug.cgi?id=14635


Roan Kattouw <[email protected]> changed:

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--- Comment #2 from Roan Kattouw <[email protected]>  2009-01-17 21:44:47 
UTC ---
(In reply to comment #1)
> Gmaxwell was kind enough to restore 4 of these images from backups he had, but
> these four images triggered another bug.
> 
> As talked about in #wikimedia-tech yesterday there were images that were
> sharing the sha1 hash of 'phoiac9h4m842xq45sp7s6u21eteeq1'  This was 
> attributed
> to them being 'old' from before images were sha1'd.
> 
> However, all 4 of the images Gmaxwell uploaded have the same hash of
> phoiac9h4m842xq45sp7s6u21eteeq1. Don't know if this is related or not, but
> action=purge doesnt seem to be fixing the problem as it did with the previous
> set of images.
> 

See also bug 17051. phoiac9h4m842xq45sp7s6u21eteeq1 is the hash of the empty
string, which suggests some breakage in the SHA-1 hashing code. This seems to
be fixed, however, as I just re-uploaded [[commons:File:5von10.jpg]] (which
previously had phoiac9h4m842xq45sp7s6u21eteeq1 as hash) over itself which
caused it to get the right hash (or at least a hash different from
phoiac9h4m842xq45sp7s6u21eteeq1). There are also images (and old revisions of
images) with img_sha1='' out there, which is probably a symptom of yet another
former bug.

Useful lists:
Last 5 revisions of [[commons:File:5von10.jpg]]:
http://commons.wikimedia.org/w/api.php?action=query&titles=File:5von10.png&gdflimit=max&prop=imageinfo&iiprop=sha1|user|comment|timestamp&iilimit=5
List of files with the same hash as [[commons:File:Amphipodredkils.jpg]]:
http://commons.wikimedia.org/w/api.php?action=query&titles=File:Amphipodredkils.jpg&generator=duplicatefiles&gdflimit=max&prop=imageinfo&iiprop=sha1


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