Experimental Physics and
Industrial Control System

Ian Smith <[email protected]> · Thu, 8 Feb 1996 14:43:48 +0000 (GMT)

Hi,

I was developing a small database and started to get consistent bus crashes:

Bus Error
Program Counter: 0x0000879c
Status Register: 0x3008
Access Address : 0x404d0000
Special Status : 0x04a5
Task: 0xe50e54 "scanPeriod"
task: 0Xe786ac taskwd

I took out all my mods to the point before they started appearing but 
they did not go away.  I tracked down the line of code that caused them 
(in my sub record c code) and it turned out to be the vxWorks 'read' 
function.  I checked all the parameters in the call and they are fine.  
(the read is reading from a tcp socket, not a disk etc).  I thought it 
unlikely to be vxWorks so I tried it in another crate and the error 
disappeared, -> hardware error.

I removed the cpu and pressed all the sockets etc but that hasn't 
helped.  The other funny thing is that this application also caused a bus 
error a few weeks ago in the crate that it now works in, but that problem 
was left unfinished rather than being tracked down.

So, the upshot is that we appear to have transient hardware errors in our 
systems.  

Has anyone come across this before, is there a particular connector that 
exhibits this behavour? (mv167)

thanks

Ian A Smith			Telephone: +44 (0) 131 668 8257
Royal Observatory		Fax:       +44 (0) 131 668 1130
Blackford Hill			Web:       http://www.roe.ac.uk/
Edinburgh
EH9 3HJ
UK

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System