Comment 1 for bug 541221

From Emma Shepherd:

I have come across a problem on an R3.14.8.2 IOC that is affecting channel access links - some records are in LINK ERROR and others have CP links that fail to update. When we started investigating we found that the CAC-TCP-recv task was in SUSPEND+I state, and the following messages had been printed to the console:

BL18I-MO-IOC-01.diamond.ac.uk:1 Wed Aug 15 16:37:26 2007 CAC-TCP-recv: A call to "assert (pca->pgetNative)" failed in ../dbCa.c at 629
BL18I-MO-IOC-01.diamond.ac.uk:1 Wed Aug 15 16:37:26 2007 Current time WED AUG 15 2007 15:37:23.708349950.
BL18I-MO-IOC-01.diamond.ac.uk:1 Wed Aug 15 16:37:26 2007 EPICS Release EPICS R3.14.8.2 $R3-14-8-2$ $2006/01/06 15:55:13$.
BL18I-MO-IOC-01.diamond.ac.uk:1 Wed Aug 15 16:37:26 2007 Please E-mail this message and the output from "tt (0x1e0ff9e0)"
BL18I-MO-IOC-01.diamond.ac.uk:1 Wed Aug 15 16:37:26 2007 to the author or to <email address hidden>

Here is the task trace:

BL18I-MO-IOC-01 -> tt 0x1e0ff9e0
231ff8 vxTaskEntry +68 : 1e8cb6e4 ()
1e8cb754 epicsThreadPrivateGet+f8 : epicsThreadCallEntryPoint ()
1e8bd048 epicsThreadCallEntryPoint+15c: 1e88b718 (1)
1e88b718 tcpRecvThread::run(void)+990: 1e88e78c () 1e88e78c tcpiiu::processIncoming(epicsTime const &, callbackManager
&)+408: cac::executeResponse(callbackManager &, tcpiiu &, epicsTime const &, caHdrLargeArray &, char *) ()
1e87a588 cac::executeResponse(callbackManager &, tcpiiu &, epicsTime const &, caHdrLargeArray &, char *)+bc : cac ::eventRespAction(callbackManager &, tcpiiu &, epicsTime const &, caHdrLargeArray const &, void *) ()
1e875fc8 cac::eventRespAction(callbackManager &, tcpiiu &, epicsTime const &, caHdrLargeArray const &, void *)+19 4:
netSubscription::completion(epicsGuard<epicsMutex> &, cacRecycle &, unsigned int, unsigned long, void const *) ()
1e89a364 netSubscription::completion(epicsGuard<epicsMutex> &, cacRecycle &, unsigned int, unsigned long, void co nst *)+84 :
oldSubscription::current(epicsGuard<epicsMutex> &, unsigned int, unsigned long, void const *) ()
1e855ff4 oldSubscription::current(epicsGuard<epicsMutex> &, unsigned int, unsigned long, void const *)+104: 1e815 434 ()
1e8156d0 dbCaGetUnits +790: epicsAssert ()
1e8c9a5c epicsAssert +154: epicsThreadSuspendSelf ()
1e8cb010 epicsThreadSuspendSelf+2c : taskSuspend () value = 0 = 0x0

Any ideas what could have caused this?