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Commit51f9ea2

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Allow interrupting GetMultiXactIdMembers
This function has a loop which can lead to uninterruptible process"stalls" (actually infinite loops) when some bugs are triggered. Avoidthat unpleasant situation by adding a check for interrupts in a placethat shouldn't degrade performance in the normal case.Backpatch to 9.3. Older branches have an identical loop here, but theaforementioned bugs are only a problem starting in 9.3 so there doesn'tseem to be any point in backpatching any further.
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‎src/backend/access/transam/multixact.c

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@@ -1278,6 +1278,7 @@ GetMultiXactIdMembers(MultiXactId multi, MultiXactMember **members,
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{
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/* Corner case 2: next multixact is still being filled in */
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LWLockRelease(MultiXactOffsetControlLock);
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CHECK_FOR_INTERRUPTS();
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pg_usleep(1000L);
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gotoretry;
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}

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