@osschar : I was able to reproduce the problem you've spotted with valgrind and here's the respective fix: d0eca52 It's great that you've been able to trigger it, it was definitely a dangerous corner case! The long story short, due to this memory realloc: https://github.com/xrootd/xrootd/blob/d0eca522e849a5f56d5e5a77f423e5d7b1b5dd1e/src/XrdCl/XrdClXRootDTransport.cc#L712 a pointer to ClientRequestHdr that is being used to release SID became invalid (this could only happen in case of connection problem, and only for read requests). I ported both commits to the _stable-4.9.x_ branch, maybe you could test and then we can close this issue? -- 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/943#issuecomment-476676591 ######################################################################## 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