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Commit9553d0f

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Ignore interrupts during quickdie().
Once the administrator has called for an immediate shutdown or a backendcrash has triggered a reinitialization, no mere SIGINT or SIGTERM shouldchange that course. Such derailment remains possible when the signalarrives before quickdie() blocks signals. That being a narrow raceaffecting most PostgreSQL signal handlers in some way, leave it foranother patch. Back-patch this to all supported versions.
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‎src/backend/tcop/postgres.c

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@@ -2610,6 +2610,13 @@ quickdie(SIGNAL_ARGS)
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sigaddset(&BlockSig,SIGQUIT);/* prevent nested calls */
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PG_SETMASK(&BlockSig);
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/*
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* Prevent interrupts while exiting; though we just blocked signals that
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* would queue new interrupts, one may have been pending. We don't want a
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* quickdie() downgraded to a mere query cancel.
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*/
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HOLD_INTERRUPTS();
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/*
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* If we're aborting out of client auth, don't risk trying to send
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* anything to the client; we will likely violate the protocol, not to

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