postgresql - Socket receive hangs in .NET 4.5 under windows 2012 -


we have web application built around nhibernate , npgsql provider, has been working fine on server 2008 r2 , .net 4. have upgraded server 2012 , 4.5 stack, , experiencing weird hangs in database layer.

we have threads freeze forever on test server (virtual instance of server 2012), , hangs approx 7.5 or 15 minutes (450 sec or 900 sec, approx) on production servers (i know because tell in logs).

when manage reproduce on testservice, , attach debugger, see 1 thread in following state:

[managed native transition]    system.dll!system.net.sockets.socket.receive(byte[] buffer, int offset, int size, system.net.sockets.socketflags socketflags, out system.net.sockets.socketerror errorcode)   system.dll!system.net.sockets.networkstream.read(byte[] buffer, int offset, int size)     mscorlib.dll!system.io.bufferedstream.readbyte()      npgsql.dll!npgsql.npgsqlstate.processbackendresponses_ver_3.movenext()    npgsql.dll!npgsql.forwardsonlydatareader.getnextresponseobject()      npgsql.dll!npgsql.forwardsonlydatareader.getnextrowdescription()      npgsql.dll!npgsql.forwardsonlydatareader.nextresult()     npgsql.dll!npgsql.forwardsonlydatareader.forwardsonlydatareader(system.collections.generic.ienumerable<npgsql.iserverresponseobject> dataenumeration, system.data.commandbehavior behavior, npgsql.npgsqlcommand command, npgsql.npgsqlconnector.notificationthreadblock threadblock, bool synchonreaderror)      npgsql.dll!npgsql.npgsqlcommand.getreader(system.data.commandbehavior cb)     npgsql.dll!npgsql.npgsqlcommand.executeblind()    npgsql.dll!npgsql.npgsqltransaction.rollback()    nhibernate.dll!nhibernate.transaction.adotransaction.rollback()

in postgres end, see running query, guess because transaction never rollbacked. using npgsql v2.0.12 (the latest stable).

what cause hang, , extremely long timeout (or lack of timeout in test)? , why differ on different os?

we did run on server 2008 r2 .net 4.5 on 1 server before, , never saw behavior either. assume since native call, os dependent?

does has theory why happen?

things check in order:

  1. locks on server side.

  2. network interruption , timeout.

  3. responsiveness on server.

  4. long-running queries.


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