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(parent: 82f8107) | patch

Fix possible crash reading pg_stat_activity.

Fix possible crash reading pg_stat_activity.

With the old code, a backend that read pg_stat_activity without ever
having executed a parallel query might see a backend in the midst of
executing one waiting on a DSA LWLock, resulting in a crash. The
solution is for backends to register the tranche at startup time, not
the first time a parallel query is executed.

Report by Andreas Seltenreich. Patch by me, reviewed by Thomas Munro.

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