Experimental Physics and
Industrial Control System

Hello,

I have a strange problem in a areaDetector plugin I currently writing. I want
to fill a mbbo record with the strings from an std::vector I get from a
library function. I copy the elements of the std::vestor to a pre allocated
char** array and fill values and severities arrays. In my writeInt32 function
I do a call to

doCallbacksEnum(strings, values, severities, nEntries, function, 0)

This leads to a crash with SIGSEGV. After recompiling my code and the asyn
module with debug symbols I managed to track down the problem to an
uninitialized variable in asynManager:

#0  0x00007ffff7f33417 in interruptStart (pasynPvt=0x0, plist=0x7fffc37f9568)
    at ../../asyn/asynDriver/asynManager.c:2438
2438        port *pport = pinterruptBase->pport;

looking at pinterruptBase it returns 0x0.
The backtrace leading to this crash is:

#0  0x00007ffff7f33417 in interruptStart (pasynPvt=0x0, plist=0x7fffc37f9568)
    at ../../asyn/asynDriver/asynManager.c:2438
#1  0x00007ffff7f56b57 in asynPortDriver::doCallbacksEnum(char**, int*, int*,
unsigned long, int, int)
    (this=0x745a90, strings=0x73f4b0, values=0x744000, severities=0x744060,
nElements=7, reason=80, address=0)
    at ../../asyn/asynPortDriver/asynPortDriver.cpp:3363
#2  0x00007ffff7df1e4b in NDFileOpenPMD::writeInt32(asynUser*, int)
    (this=<optimized out>, pasynUser=<optimized out>, value=<optimized out>)
at ../NDFileOpenPMD.cpp:192

My driver is derived from NDFilePlugin as:

NDPluginFile(portName, queueSize, blockingCallbacks,
                 NDArrayPort, NDArrayAddr, 1,
                 0, 0, asynGenericPointerMask | asynEnumMask,
asynGenericPointerMask | asynEnumMask,
                 ASYN_CANBLOCK, 1, priority, stackSize, 1, true)

So in my understanding it should be configured to be able to use enum
functions.

Can anybody help me to figure out what I'm doing wrong?  I did a crosscheck
with other areaDetector plugin drivers if there is a special setting missing
and also looked at the examples from asy, but could not figur out whjat is
wrong in my code.

Regards,

Jörn Dreyer