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http://tracker.firebirdsql.org/browse/CORE-4680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vlad Khorsun reopened CORE-4680:
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I can confirm rare AV's in fbclient but i see no hung of server
> Possible deadlock in firebird connect.
> --------------------------------------
>
> Key: CORE-4680
> URL: http://tracker.firebirdsql.org/browse/CORE-4680
> Project: Firebird Core
> Issue Type: Bug
> Components: Engine
> Affects Versions: 3.0 Beta 2
> Environment: Linux / Windows
> Reporter: Sascha Michel
> Priority: Critical
>
> Approximately every month i see a "firebird superserver" that stalled.
> I must restart the server with the init script , every connect to the server
> is impossible.
> Firebird offers the following message in the log file:
> Koenig_DB_server (Server) Tue Oct 21 10:47:50 2014
> Shutting down the server with 26 active connection(s) to 1
> database(s), 0 active service(s)
> Koenig_DB_server (Server) Thu Nov 13 07:50:54 2014
> Shutting down the server with 16 active connection(s) to 1
> database(s), 0 active service(s)
> Koenig_DB_server (Server) Thu Jan 15 09:42:31 2015
> Shutting down the server with 30 active connection(s) to 1
> database(s), 0 active service(s)
> Koenig_DB_server (Server) Fri Jan 30 10:24:50 2015
> Shutting down the server with 27 active connection(s) to 1
> database(s), 0 active service(s)
> Since it was years long so goes, I have written a little program, with which
> I was able to replicate the problem.
> 1 .A connection is established to the database server
> 2. 9 events registered.
> 3. Waited a short time ( millisecond )
> 4. Unregister the events.
> 5. Connection closed.
> 6. Start all over again.
> If it is possible to kill the process that caused the deadlock, the server
> continues to run normal.
> If no events were registered it does not happen.
> I was able to reproduce the problem under "super server firebird 2.5 / 3beta2
> linux / windows".
> Here's a video that shows that problem.
> https://datiscum.com/FB_Test_x264.mp4
> The program can be downloaded here.
> https://datiscum.com/FirebirdTest.7z
> The downloads are available only for a few days.
> I hope this was helpful and the problem can be eliminated.
> Regards,
> Sascha Michel
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