The cause is https://gerrit.wikimedia.org/r/#/c/113038/

On Tue, Mar 11, 2014 at 3:29 PM, Thomas Gries mail@tgries.de wrote:

RE: https://bugzilla.wikimedia.org/show_bug.cgi?id=62233

There's a problem is somewhere in the core which causes warnings. Can anyone confirm who runs a recent core version younger than 2014-02-28 ?

Logfiles in my recently upgraded (git pull) installations are filling up with warnings

    "Cannot modify header information - headers already sent in

/includes/WebResponse.php on line 38" (No. My PHP files do not have spooky blank lines.)

With "bisect" I determined that the problem appears to be introduced by a certain commit and seems to be caused by the ***MERGE*** of9e66a63af83427a01d66795ac64b793ff4473218 https://gerrit.wikimedia.org/r/#q,9e66a63af83427a01d66795ac64b79 3ff4473218,n,z

commit830eb262fe76ef3ad49f91daad5e152af8ce9bc4 < https://gerrit.wikimedia.org/r/#q,830eb262fe76ef3ad49f91daad5e15 2af8ce9bc4,n,z> ==> NOT OKAY (triggers warning) Merge: 25466a0 9e66a63 Author: jenkins-bot Date: Fri Feb 28 02:19:02 2014 +0000

Merge "Use inContentLanguage for dropdown messages in HTMLFormField"

commit9e66a63af83427a01d66795ac64b793ff4473218 < https://gerrit.wikimedia.org/r/#q,9e66a63af83427a01d66795ac64b79 3ff4473218,n,z> ==> OKAY (does not trigger warnings) Author: Marius Date: Fri Feb 28 03:12:10 2014 +0100

Use inContentLanguage for dropdown messages in HTMLFormField
to restore b/c for now.

Bug: 61942
Change-Id:I2741ef940d83eeb564e89e20378fb4004cfe5b83  <

https://gerrit.wikimedia.org/r/#q,I2741ef940d83eeb564e89e20378fb 4004cfe5b83,n,z>

Therefore I think, that the problem is caused by something messed up in this diff:

http://git.wikimedia.org/compare/mediawiki%2Fcore.git/ 830eb262fe76ef3ad49f91daad5e152af8ce9bc4..9e66a63af83427a01d66795ac64b79 3ff4473218

I kindly ask anyone who can to help to look into that problem.

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