On Mon, Dec 5, 2016 at 3:07 PM, Andreas Seltenreich <seltenre...@gmx.de> wrote: > on master as of a0ae54d, there's a 1 in 10e6 chance sqlsmith catches > gather_readnext reading beyond the gatherstate->readers array with > readers[gatherstate->readnext]. Sample backtrace below. > > As readnext is never explicitly initialized, I think what happens is > that a rescan gets less workers than the initial scan, and the dangling > readnext points outside the array. I'm no longer seeing these crashes > when explicitly initializing readnext to 0 like in the attached patch.
Thanks, great catch! Committed and back-patched to 9.6. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers