mwalker wrote:

efRaiseAccountCreationThrottle is in wmf-config/throttle.php; but the line that's failing was last touched in late 2012 so this is a regression of some sort.

1. Allow extensions to improve our guess

		wfRunHooks( 'GetIP', array( &$ip ) );

		if ( !$ip ) {
			throw new MWException( "Unable to determine IP" );
		}

v> var_dump( $wgHooks['GetIP'] );
PHP Notice: Undefined index: GetIP in /a/common/php-1.22wmf16/maintenance/eval.php(72) : eval()'d code on line 1

Notice: Undefined index: GetIP in /a/common/php-1.22wmf16/maintenance/eval.php(72) : eval()'d code on line 1
NULL

There doesn't seem to be any subscribers to that hook. Not sure efRaiseAccountCreationThrottle is related either, it only calls wfGetIP();

reedy@fluorine:/a/mw-log$ grep "determine IP" -c exception.log
27401
reedy@fluorine:/a/mw-log$ grep -c "\[" exception.log
55579

So it accounts for a huge amount of the lines. I guess we need to stuff some more debugging in it

(In reply to comment #2)

I guess we need to stuff some more debugging in it

Reedy: Would you have time for that? If not, who else could do that? :-/

https://gerrit.wikimedia.org/r/#/c/84866/ was merged and deployed

(In reply to comment #4)

https://gerrit.wikimedia.org/r/#/c/84866/ was merged and deployed

Ah thanks, Nemo! Based on the commit message, I guess that fixes it.