I'm not sure that this is APC related. I removed it from php.ini and deleted its .so extension and I still get these errors, but for sure APC caused them since I got seg fails during its installation.
I've been on 2.4.4 for several months (and PHP 5.4) with no issues until I installed APC which screwed everything. No idea why these errors are still going when APC is gone, and I guess debugging these would be painful.