Fix dangling smgr_owner pointer when a fake relcache entry is freed.
A fake relcache entry can "own" a SmgrRelation object, like a regular
relcache entry. But when it was free'd, the owner field in SmgrRelation
was not cleared, so it was left pointing to free'd memory.
Amazingly this apparently hasn't caused crashes in practice, or we would've
heard about it earlier. Andres found this with Valgrind.
Report and fix by Andres Freund, with minor modifications by me. Backpatch
to all supported versions.
Branch
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REL9_0_STABLE
Details
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http://git.postgresql.org/pg/commitdiff/0f714c602cd260cace1f8c2d61896d7851990021
Modified Files
--------------
src/backend/access/transam/xlogutils.c | 3 +++
src/backend/storage/smgr/smgr.c | 18 ++++++++++++++++++
src/include/storage/smgr.h | 1 +
3 files changed, 22 insertions(+)
