john wrote:

Got a line number?

Oops, it is on line 1122.

On the FAQ page the following wikitext crash the parser:

{{msg-mw|Edittoolbar-help-content-heading1-syntax}}

With the additional parameter 'notext=Yes' it is fine:

{{msg-mw|Edittoolbar-help-content-heading1-syntax|notext=Yes}}

I have uploaded the test cases as subpages of http://translatewiki.net/wiki/User:Hashar/bug32057 . Clicking the /crash results in a blank page.

But this works: https://translatewiki.net/wiki/User:Hashar/bug32057/crash?uselang=en
This doesn't: https://translatewiki.net/wiki/User:Hashar/bug32057/crash?uselang=it

Importing User:Hashar/bug32057{,/crash,/nocrash} into trunk, it doesn't fail.
Seems dependant of {{UILANGCODE}}, which I'm told it's a propietary modification by translatewiki. :)

I've offered access for debugging, I have identified the revision which causes it. UILANGCODE is involved, but like with the previous bug it is not mandatory for causing the bug. What more can I do?

Just {{int:Edittoolbar-help-content-heading1-syntax}} was crashing translatewiki.
Fixed in r102440.