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Commitbed5eac

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Unset MyBEEntry, making elog.c's call to pgstat_get_my_query_id() safe.
Previously log messages late during shutdown could end up using either anotherbackend's PgBackendStatus (multi user) or segfault (single user) becausepgstat_get_my_query_id()'s check for !MyBEEntry didn't filter out use afterpgstat_beshutdown_hook().This became a bug in4f0b096, but was a bit fishy before. But giventhere's no known problematic cases before 14, it doesn't seem worthbackpatching further.Also fixes a wrong filename in a comment, introduced ine102504.Reported-By: Andres Freund <andres@anarazel.de>Reviewed-By: Julien Rouhaud <rjuju123@gmail.com>Discussion:https://postgr.es/m/Julien Rouhaud <rjuju123@gmail.com>Backpatch: 14-
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‎src/backend/utils/activity/backend_status.c

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -46,7 +46,7 @@ boolpgstat_track_activities = false;
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intpgstat_track_activity_query_size=1024;
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/* exposed so thatprogress.c can access it */
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/* exposed so thatbackend_progress.c can access it */
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PgBackendStatus*MyBEEntry=NULL;
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@@ -469,6 +469,9 @@ pgstat_beshutdown_hook(int code, Datum arg)
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beentry->st_procpid=0;/* mark invalid */
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PGSTAT_END_WRITE_ACTIVITY(beentry);
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/* so that functions can check if backend_status.c is up via MyBEEntry */
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MyBEEntry=NULL;
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}
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/*

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