[#CORE-6371] Avoid server crash on shutdown in case of wrong reference counting in UDR

Firebird Core

CORE-6364

Created: 24/Jul/20 03:44 PM Updated: 24/Jul/20 03:48 PM

Component/s:

Engine

Affects Version/s:

4.0 Beta 2, 3.0.6

Fix Version/s:

3.0.7, 4.0 RC 1

QA Status:

No test

Description

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Wrong reference counting in UDR should not cause segfaults at shutdown, instead hanging attachments should be carefully closed.

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I commit this fix - though it keeps to have a lot of different IProvider interfaces per single provider, but it helps avoid segfault.