Re: IOC lost all comms

[Andrew Johnson <anj@aps.anl.gov>]

Al Honey wrote:
> One of our IOCs became unresponsive to CA requests.
>
> aux2:1041 Tue Apr 25 19:12:02 2006 filename="../taskwd.c" line number=159
> aux2:1041 Tue Apr 25 19:12:02 2006 task 3718270 cbLow suspended                    ß
> aux2:1041 Tue Apr 25 19:12:35 2006 filename="../dbNotify.c" line number=257
> aux2:1041 Tue Apr 25 19:12:35 2006 S_errno_EINTR dbNotifyCancel had semTake timeout
> aux2:1041 Tue Apr 25 19:12:37 2006 filename="../dbNotify.c" line number=257
> aux2:1041 Tue Apr 25 19:12:37 2006 S_errno_EINTR dbNotifyCancel had semTake timeout
> aux2:1041 Tue Apr 25 19:12:38 2006 filename="../dbNotify.c" line number=257
> aux2:1041 Tue Apr 25 19:12:38 2006 S_errno_EINTR dbNotifyCancel had semTake timeout
> aux2:1041 Tue Apr 25 19:12:42 2006 0xlename="../dbNotify.c" line number=257
>
> where the semTake timeout repeated until the IOC was rebooted.
>
> Unfortunately those that were party to the problem did not attempt to 
> diagnose, so there is no other feedback.
>
> Does anyone know under what conditions the cbLow task will become suspended?

A task suspend often means there was a bus error, or some that other 
processor level exception occurred which vxWorks can't fix itself.  The 
cbLow task will be used at record I/O completion time by almost every 
asynchronous device support where the record's PRIO field is set to Low. 
 The callback tasks are also used by SEQ records for processing the 
input/output link pairs, by bo records that specify a positive value for 
HIGH, by calcout records that set ODLY and by histogram records (not 
quite sure what for though).

HTH,

- Andrew
--
There is no S in exprexxo.