Hi, Andrew! On Jun 02, Andrew McDonnell wrote: > Hi all > > (Cross-posted to oqgraph-developers, maria-developers) > > I am trying to track down a segfault apparently triggered by concurrent > execution of queries through OQGraph - for context, see: > > https://mariadb.atlassian.net/browse/MDEV-6282 > > I am however a bit confused as to what is going on, because at least some of > the information leads me to suspect that there could be more going on here > than just a simple race condition. > > --Immediate Cause-- > > On the surface, a segfault appears to be caused in a method in sql_class.h, > Statement::check_limit_rows_examined() dereferencing a NULL pointer, `lex`. > The method check_limit_rows_examined() was called from sql_class.h method > handler::increment_statistics() .
I don't see how thd->lex could be NULL there. It shouldn't be changed concurrently on anything. Can you actually repeat the crash? Regards, Sergei _______________________________________________ Mailing list: https://launchpad.net/~maria-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~maria-developers More help : https://help.launchpad.net/ListHelp
