Обсуждение: pgsql: Avoid using a fake relcache entry to own an SmgrRelation.
Avoid using a fake relcache entry to own an SmgrRelation. If an error occurs before we close the fake relcache entry, the the fake relcache entry will be destroyed by the SmgrRelation will survive until end of transaction. Its smgr_owner pointer ends up pointing to already-freed memory. The original reason for using a fake relcache entry here was to try to avoid reusing an SMgrRelation across a relevant invalidation. To avoid that problem, just call smgropen() again each time we need a reference to it. Hopefully someday we will come up with a more elegant approach, but accessing uninitialized memory is bad so let's do this for now. Dilip Kumar, reviewed by Andres Freund and Tom Lane. Report by Justin Pryzby. Discussion: http://postgr.es/m/20220802175043.GA13682@telsasoft.com Discussion: http://postgr.es/m/CAFiTN-vSFeE6_W9z698XNtFROOA_nSqUXWqLcG0emob_kJ+dEQ@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/76733b399c490885564a560718de23d98bb5e66d Modified Files -------------- src/backend/commands/dbcommands.c | 15 +++-------- src/backend/storage/buffer/bufmgr.c | 51 +++++++++++++++++-------------------- 2 files changed, 28 insertions(+), 38 deletions(-)