pgsql: Fix memory leak in SnapBuildSerialize.

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pgsql: Fix memory leak in SnapBuildSerialize.

Amit Kapila-3
Fix memory leak in SnapBuildSerialize.

The memory for the snapshot was leaked while serializing it to disk during
logical decoding. This memory will be freed only once walsender stops
streaming the changes. This can lead to a huge memory increase when master
logs Standby Snapshot too frequently say when the user is trying to create
many replication slots.

Reported-by: [hidden email]
Diagnosed-by: [hidden email]
Author: Amit Kapila
Backpatch-through: 9.5
Discussion: https://postgr.es/m/033ab54c-6393-42ee-8ec9-2b399b5d8cde.funnyxj.fxj@...

Branch
------
REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/f2b268ee0626286d15a1eaa78fe1704811d51cd4

Modified Files
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src/backend/replication/logical/snapbuild.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)