On Tuesday 20 April 2010, Dirk Zimoch wrote:
> Tim Mooney wrote:
> > Dirk, I was seeing something similar (though in 3.14.11),
> > and "dbpr <recordname>,5" showed "DTYP: <nil>",
> > until I added the line
> > device(aao,CONSTANT,devAaoSoft,"Soft Channel")
> > to the .dbd file.
>
> Hi Tim.
>
> That is not the problem:
> DTYP: Soft Channel
>
> The ioc also crashes when the aao record is not processed! Thus DTYP
> cannot be the problem.
I believe the aao record support is at fault.
The problem is that it does not allocate bptr itself but leaves this to
device support. However, when device support's init_record method is called,
it is too late. Because by then links have already been initialized, thus
cvt_db_addr has been called, which sets the field address to bptr, i.e.
NULL.
This explains why regular puts work but puts via db links lead to a crash.
If you dbpf from the ioc shell or do caput, the cvt_db_addr gets called and
since this is after device support init, bptr will contain a valid pointer
to the array.
You could verify my theory by issuing a 'caput aao1.OUT aao2'. After this,
the IOC should not crash when processing aao1. It shoudl still crash when
processing ao1, until you re-initialize thits OUT link, too.
Solution: Fix aao (and probably aai) record support to either allocate bptr
itself or else call device support's init_record during the first pass of
record support initialization.
Cheers
Ben
- Replies:
- Re: writing to aao crashes ioc Korhonen Timo
- Re: writing to aao crashes ioc Dirk Zimoch
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- Re: writing to aao crashes ioc Tim Mooney
- Re: writing to aao crashes ioc Dirk Zimoch
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