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<== Date ==> <== Thread ==>
Subject: Re: Bus errors accessing VME with base 7.0.6.1 and latest synApps modules
From: Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>
To: Mark Rivers <rivers at cars.uchicago.edu>
Cc: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Sat, 21 May 2022 14:31:10 -0700 
On 5/21/22 11:05, Mark Rivers wrote:

ØWhat specific board is involved?  (eg. mvme3100?)

The test crate is an MVME5100.  But the production crates that were also failing include several MVME2700 boards as well as some MVME5100.


Ok, so all powerpc.  PPC Machine Check exception is asynchronous.
So I'm more confident in claiming the mention of "CAS-event"
is false.  The faulting instruction probably originates on some
other scan/driver thread, then there is a context switch
to "CAS-event" because of a call to db_post_events().

It still seems odd to me that the CPU could get all the way
into db_post_events() and wake up "CAS-event" before a VME
cycle completes.  (maybe there are VME timeout happening?)


In addition to Base 7.0.5 and and 7.0.6.1, could you test
with 7.0.6 ?

This might narrow things down a little.


Since you already have a version range to suspect, you
could try to narrow down further with git-bisect.

(although I can't honestly recommend this as a good way
to pass what for me is a nice Saturday afternoon.)

https://git-scm.com/docs/git-bisect


git bisect start R7.0.5 R7.0.6.1
Replies:
RE: Bus errors accessing VME with base 7.0.6.1 and latest synApps modules Mark Rivers via Tech-talk
References:
Bus errors accessing VME with base 7.0.6.1 and latest synApps modules Mark Rivers via Tech-talk
RE: Bus errors accessing VME with base 7.0.6.1 and latest synApps modules Mark Rivers via Tech-talk
RE: Bus errors accessing VME with base 7.0.6.1 and latest synApps modules Mark Rivers via Tech-talk
RE: Bus errors accessing VME with base 7.0.6.1 and latest synApps modules Mark Rivers via Tech-talk
Re: Bus errors accessing VME with base 7.0.6.1 and latest synApps modules Michael Davidsaver via Tech-talk
RE: Bus errors accessing VME with base 7.0.6.1 and latest synApps modules Mark Rivers via Tech-talk
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