pgsql: Fix memory leak in pgstat_progress_parallel_incr_param()

Started by Michael Paquier16 days ago1 messagescomitters

michael@paquier.xyz

16 days ago

Fix memory leak in pgstat_progress_parallel_incr_param()

When called from a parallel worker, this function calls initStringInfo()
and pq_beginmessage(), causing a StringInfo allocation to happen twice.
pq_endmessage() frees only the second allocation, with each call leaking
~1 kB into the per-worker memory context. This could cause a few
hundred megabytes worth of memory to pile up until the worker exits (the
message allocations happen in the parallel worker context), with the
situation being worse the longer a parallel worker runs.

Oversight in f1889729dd3.

Author: Baji Shaik <baji.pgdev@gmail.com>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Reviewed-by: Tristan Partin <tristan@partin.io>
Discussion: /messages/by-id/CA+fm-RMopta1Dmq8udiU5sp+zwTvhUf4+xfbr3rZDfczH+p-xw@mail.gmail.com
Backpatch-through: 17

Branch
------
REL_17_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/8ad4148313d42a6d260c5c63f295bf3a22dae252

Modified Files
--------------
src/backend/utils/activity/backend_progress.c | 2 --
1 file changed, 2 deletions(-)