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Here's a simplified case of a deadlock we saw in production in CMS (see https://github.com/bbockelm/cmssw/commit/ac0156350d2aa2539cf91ad2ec5f7318dd520807 for the full case, which involved a third mutex). Thread 1: - FileTimer::Run holds FileTimer::pMutex - FileStateHandler::Tick wants to take the FileStateHandler::pMutex Thread 2: - FileStateHandler::OnStateError holds the FileStateHandler::pMutex lock - User callback is invoked, deletes an XrdCl::File object - ~FileStateHandler calls FileTimer::UnRegisterFileObject which tries to get the FileTimer::pMutex. This hasn't been seen in production (yet) but seems plausible. --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/216 ######################################################################## 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