Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Fri, 31 Oct 2003 08:42:44 -0600

Marty wrote:

> Nothing obvious. The failure occurs on the statement
> 
> epicsMutexMustLock(pca->lock);
> 
> Other than memory corruption it is hard to explain why this fails.
> 
> Does this happen the very first time $(P)AbortScansSEQ is processed?

Yes.

> Before it is processed issue the instruction
> 
> dbcar "$(P)AbortScansSEQ",3
> 
> Does it show everything connected?

Here's the output, everything is connected.

ioc13lab> dbcar "13LAB:AbortScansSEQ",3
    connected ioc13lab 13LAB:AbortScansSEQ.LNK1 13LAB:scanH.EXSC
    connected ioc13lab 13LAB:AbortScansSEQ.LNK2 13LAB:scan1.EXSC
    connected ioc13lab 13LAB:AbortScansSEQ.LNK3 13LAB:scan2.EXSC
    connected ioc13lab 13LAB:AbortScansSEQ.LNK4 13LAB:scan3.EXSC
    connected ioc13lab 13LAB:AbortScansSEQ.LNK5 13LAB:scan4.EXSC
ncalinks 5 not connected 0 no_read_access 0 no_write_access 0
 nDisconnect 0 nNoWrite 0
ca_client_context at 0x15baf50 pndRecvCnt=0 ioSeqNo=0
epicsMutexId 0x15bad58 source ../../../src/libCom/osi/epicsMutex.cpp line 196
Channel Access Client Context at 0x15a3cf0 for user iocboot
        revision "@(#) EPICS 3.14.4, CA Portable Server Library Oct  6 2003"
        preemptive callback is enabled
        there are 0 unsatisfied IO operations blocking ca_pend_io()
        the current io sequence number is 0
IO done event:

Semaphore Id        : 0x15a6c90   
Semaphore Type      : BINARY    
Task Queuing        : FIFO      
Pended Tasks        : 0         
State               : EMPTY     

Is the message about the epicsMutexId with the source code line number normal?

Memory corruption is certainly possible, but if I don't process that one record then the IOC runs for many weeks with no other symptoms of problems.  The same record causes the same problem in multiple IOCs with very different configurations (records loaded, SNL programs running, etc.).

Mark

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System