On Fri, Mar 28, 2025 at 09:00:00PM +0200, Alexander Lakhin wrote: > Please try the following query: > BEGIN; > SET LOCAL stats_fetch_consistency = snapshot; > SELECT * FROM pg_stat_get_backend_wal(pg_backend_pid()); > > with sanitizers (or under Valgrind). When I run it, I get: > 2025-03-28 18:38:08.259 UTC [3415399] LOG: statement: SELECT * FROM > pg_stat_get_backend_wal(pg_backend_pid()); > ================================================================= > ==3415399==ERROR: AddressSanitizer: heap-use-after-free on address > 0x53100003c83c at pc 0x556e3d2d9967 bp 0x7ffda3cd2350 sp 0x7ffda3cd2340 > READ of size 4 at 0x53100003c83c thread T0 > #0 0x556e3d2d9966 in pgstat_fetch_stat_backend_by_pid > .../src/backend/utils/activity/pgstat_backend.c:136 > #1 0x556e3d53b671 in pg_stat_get_backend_wal > .../src/backend/utils/adt/pgstatfuncs.c:1673 > #2 0x556e3cb14045 in ExecMakeTableFunctionResult > .../src/backend/executor/execSRF.c:234 > #3 0x556e3cb6c0fd in FunctionNext > .../src/backend/executor/nodeFunctionscan.c:94 > #4 0x556e3cb171d2 in ExecScanFetch > ../../../src/include/executor/execScan.h:126 > #5 0x556e3cb171d2 in ExecScanExtended > ../../../src/include/executor/execScan.h:170 > #6 0x556e3cb171d2 in ExecScan .../src/backend/executor/execScan.c:59 > #7 0x556e3cb6bbf7 in ExecFunctionScan > .../src/backend/executor/nodeFunctionscan.c:269 > #8 0x556e3cb0aba9 in ExecProcNodeFirst > .../src/backend/executor/execProcnode.c:469 > ... > > Reproduced starting from 76def4cdd.
Thanks for the report. I have added an open item to not lose track of this issue, and will get back to it when I can. -- Michael
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