Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Tue, 15 Feb 2011 09:43:08 -0700

Hello Carsten,

> "caput.exe" runs sometimes into exception! This exception 
> is very hard to catch (1% of calls in my case).
> The exception occurs in the connectNotify function in "src/ca/tcpiiu.cpp":

My hypothesis is that this 1% corresponds with situations where caput.exe
times out waiting for the connect, and in this situation occasionally the ca
client context is being destroyed a very close to the same time that another
thread is processing a channel connect response message.

It appears that your issue might be fixed by prior revision 12173 (occurring
on 2011-01-15) to ca/tcpiiu.cpp. Unfortunately, I am having trouble finding
the relevant bug report to link to at launch-pad.

If this does not resolve your issue let me know and I will look more
carefully at the source.

C:\hill\epicsInBazaar\R3.14\trunk\src\ca>bzr diff -c12173 tcpiiu.cpp
=== modified file 'src/ca/tcpiiu.cpp'

--- src/ca/tcpiiu.cpp 2010-09-20 21:21:50 +0000
+++ src/ca/tcpiiu.cpp 2011-01-15 00:53:33 +0000
@@ -1866,10 +1866,14 @@
     guard.assertIdenticalMutex ( this->mutex );

     while ( nciu * pChan = this->createReqPend.get () ) {
+ pChan->channelNode::listMember =
+ channelNode::cs_none;
         pChan->serviceShutdownNotify ( cbGuard, guard );
     }

     while ( nciu * pChan = this->createRespPend.get () ) {
+ pChan->channelNode::listMember =
+ channelNode::cs_none;
         // we dont yet know the server's id so we cant
         // send a channel delete request and will instead
         // trust that the server can do the proper cleanup
@@ -1878,12 +1882,16 @@
     }

     while ( nciu * pChan = this->v42ConnCallbackPend.get () ) {
+ pChan->channelNode::listMember =
+ channelNode::cs_none;
         this->clearChannelRequest ( guard,
             pChan->getSID(guard), pChan->getCID(guard) );
         pChan->serviceShutdownNotify ( cbGuard, guard );
     }

     while ( nciu * pChan = this->subscripReqPend.get () ) {
+ pChan->channelNode::listMember =
+ channelNode::cs_none;
         pChan->disconnectAllIO ( cbGuard, guard );
         this->clearChannelRequest ( guard,
             pChan->getSID(guard), pChan->getCID(guard) );
@@ -1891,6 +1899,8 @@
     }

     while ( nciu * pChan = this->connectedList.get () ) {
+ pChan->channelNode::listMember =
+ channelNode::cs_none;
         pChan->disconnectAllIO ( cbGuard, guard );
         this->clearChannelRequest ( guard,
             pChan->getSID(guard), pChan->getCID(guard) );
@@ -1898,6 +1908,8 @@
     }

     while ( nciu * pChan = this->unrespCircuit.get () ) {
+ pChan->channelNode::listMember =
+ channelNode::cs_none;
         pChan->disconnectAllIO ( cbGuard, guard );
         // if we know that the circuit is unresponsive
         // then we dont send a channel delete request and
@@ -1907,6 +1919,8 @@
     }

      while ( nciu * pChan = this->subscripUpdateReqPend.get () ) {
+ pChan->channelNode::listMember =
+ channelNode::cs_none;
         pChan->disconnectAllIO ( cbGuard, guard );
         this->clearChannelRequest ( guard,
             pChan->getSID(guard), pChan->getCID(guard) );

Jeff
______________________________________________________
Jeffrey O. Hill           Email        [email protected]
LANL MS H820              Voice        505 665 1831
Los Alamos NM 87545 USA   FAX          505 665 5107

Message content: TSPA

With sufficient thrust, pigs fly just fine. However, this is
not necessarily a good idea. It is hard to be sure where they
are going to land, and it could be dangerous sitting under them
as they fly overhead. -- RFC 1925


> -----Original Message-----
> From: Carsten Winkler [mailto:[email protected]]
> Sent: Tuesday, February 15, 2011 2:33 AM
> To: Jeff Hill
> Subject: Re: soft ioc runs into fatal exception (base-3.14.12)
> 
> Hello Jeff,
> 
> here is the call stack of exception case:
> 
>      ca.dll!tsDLList<nciu>::remove(nciu & item={...})  line 230 + 0x9
> Bytes    C++
>       ca.dll!tcpiiu::connectNotify(epicsGuard<epicsMutex> & guard={...},
> nciu & chan={...})  line
> 1945    C++
>       ca.dll!cac::createChannelRespAction(callbackManager & mgr={...},
> tcpiiu & iiu={...}, const
> epicsTime & __formal={...}, const caHdrLargeArray & hdr={...}, const
> epicsTime & __formal={...})
> line 1126 + 0x10 Bytes    C++
>       ca.dll!cac::executeResponse(callbackManager & mgr={...}, tcpiiu &
> iiu={...}, const epicsTime &
> currentTime={...}, caHdrLargeArray & hdr={...}, char *
> pMshBody=0x0097f7f8)  line 1193 + 0x1f
> Bytes    C++
>       ca.dll!tcpiiu::processIncoming(const epicsTime & currentTime={...},
> callbackManager &
> mgr={...})  line 1252 + 0x2e Bytes    C++
>       ca.dll!tcpRecvThread::run()  line 519 + 0x13 Bytes    C++
>       Com.dll!epicsThreadCallEntryPoint(void * pPvt=0x003db0b8)  line 85 +
> 0x13 Bytes    C++
>       Com.dll!epicsWin32ThreadEntry(void * lpParameter=0x003da098)  line
> 499 + 0x11 Bytes    C
>       msvcr100d.dll!_callthreadstartex()  line 314 + 0xf Bytes    C
>       msvcr100d.dll!_threadstartex(void * ptd=0x003dfd68)  line 297    C
>       kernel32.dll!_BaseThreadStart@8()  + 0x37 Bytes
> 
> 
> Hope you can fix this problem because we have same problem in our
> OpcIocShell since many month. A
> fairy long time we thought this problem comes from OPC extension. But
> couldn't find the bug. Now we
> hope your fix for ca.dll will solve our problem in OpcIocShell too.
> 
> Greetings from Berlin
> Carsten
> 
> ________________________________
> 
> Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
> 
> Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher
> Forschungszentren e.V
> 
> Aufsichtsrat: Vorsitzender Prof. Dr. Dr. h.c. mult. Joachim Treusch, stv.
> Vorsitzende Dr. Beatrix Vierkorn- Rudolph
> Geschäftsführer: Prof. Dr. Anke Rita Kaysser-Pyzalla, Prof. Dr. Dr. h.c.
> Wolfgang Eberhardt, Dr. Ulrich Breuer
> 
> Sitz Berlin, AG Charlottenburg, 89 HRB 5583
> 
> Postadresse:
> Hahn-Meitner-Platz 1
> D-14109 Berlin
> 
> http://www.helmholtz-berlin.de




Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System