Hi, (I fixed this problem, I'm posting it nevertheless because it might
be interesting to others)
I updated MediaWiki from 1.15.5 to 1.17alpha and got an interesting
error: thumbnails could not be generated anymore; there was an empty
error message (via thumb.php:147). I traced it back to the ImageMagick
call made by MediaWiki, see
http://pastebin.ca/2047146.
Two notable facts:
a) MediaWiki didn't return ulimit's error and instead displayed a
generic error. This should not be the case.
b) I have mostly default settings and enough RAM (>1gb on machine, 512MB
set in php.ini). This *should* work with default settings.
It turned out that the default setting of $wgMaxShellMemory = 102400;
was too low. Increasing it by *10 fixed all problems.
Is the default setting perhaps too low? Anyone else experience this problem?
Also: Were there any major changes on how images are handled between
1.15 and 1.17? Previously thumbnails worked just fine.
Regards,
Tobias / User:Church of emacs