Re: "assert (!plink->value.pv_link.pvt)" failed

[Marty Kraimer <mrk@aps.anl.gov>]

Feng, Shuchen wrote:
> I am porting a device drvier for the Joerger scaler VSC16
> from vxWorks to RTEMS.  The EPICS release is R3.14.0beta2.
> The IOC ran the scaler_init routine sucessfully.  However,
> it failed somewhere before (? or in ?) the scaler_init_record
> routine. The erro message is :
>
> A call to "assert (!plink->value.pv_link.pvt)" failed in ../dbCa.c line 157.
> EPICS Release EPICS R3.14.0.beta.2 $R3-14-0-beta-2$ $2002/07/30 21:40:55$.
> Current time Wed Mar 26 2003 16:46:05.420000000.
> Please E-mail this message to the author or to tech-talk@aps.anl.gov
> Calling epicsThreadSuspendSelf()
>
>
> Here it is. I am reporting this error to the tech-talk. Any clue ?
> The problem is that the error did not mention which line of the database
> triggered the error.  I was able to load database for a bitIO device
> sucessfully with the same platform.
>
>
> Any pointer would be highly appreciated,
> Kate

I am not familiar with the Joerger VSC16 device support so it is hard to know 
where to start.

The error is because some DBF_XXXLINK has not been initialized properly.

Some suggestions.

If you know how to use a linux source level debugger it will make your task easier.

If not do the following:

Put printf statement in the init_record routines of both record and device 
support. Put the printf statement at entrace and exit and before/after any call 
to other routines.

Then send another Email message showing.

1) The output of the printfs
2) The source for the device support.
3) If any recordtype not coming from base is used, it's source.
3) The record definitions from the database that causes the problem.

Marty Kraimer