Hi Bastian, Wow that was quick, I haven't announced the release yet ;-) We haven't changed the implementation of XrdSys::LinuxSemaphore since February 2016, did something change on your side? compiler version? Could you run the same test with 4.5.0, so we can confirm that it is 100% 4.6.0 specific? How are you building xrootd? using the spec file, plain cmake? What version of gcc do you use? Could you try to build with -fno-omit-frame-pointer and see if that helps? Thanks, Michal -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/458#issuecomment-278035248 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1