mpr(4) SAS3008 Repeated Crashing

[Steven Hartland]

Initial ideas would be bad signalling.

If you have the option to drop the speeds down and that helps then 
almost certainly the case.

The original mfi driver was very bad at recovering from issues like this 
too, I spent over a month fixing and patching it to get it working 
reliably when there where hardware related issues. In my case it turned 
out the be a dodge CPU causing memory corruption but you'll get similar 
behaviour from badly designed installs, particularly with expanders in 
play for high speed devices (6-12Gbps) link speed.

     Regards
     Steve

On 01/03/2016 20:38, Sean Bruno wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
> We're starting to look into cabling and whatnot on a group of
> Supermicro hosts we're using after repeatedly running into a
> crash/timeout that more or less looks like the following capture from
> the serial console:
>
> https://people.freebsd.org/~sbruno/mpr_stable10.txt
>
> sean
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2
>
> iQF8BAEBCgBmBQJW1f20XxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w
> ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRCQUFENDYzMkU3MTIxREU4RDIwOTk3REQx
> MjAxRUZDQTFFNzI3RTY0AAoJEBIB78oecn5k9tEH/3nasxb6yWshKzskzOr5KxwY
> dBV2RkoDlq0GKc/oYBfOOsvOAegnrHCFRDQTlXIL3nvBMDyZgtEalcbsnF2jWMaA
> Ff4Lt5ZJeg03Xc+Ge/wbAIAThzsCrbH2isLS1jnZi3sc047WtN+HjhAxfozUL/Dj
> 1beCTgda36A4K7DBBvPz0gcRS2e/a8Xy1mhlIOr4n3eG+kZrAUSTYrAVos6JybkN
> YipRQeHeUDJlO2vSxYITK9kzJn887eg/iwk0udtIaranzJ3CCTmZn3gHuyVDjKJy
> eq9DsxrtCvcAMbw4SGrJqPi0BwjfejLgD/+LXAs9Dh6L3BFqZ9Z1BsjlJvfHLXI=
> =q6ub
> -----END PGP SIGNATURE-----
> _______________________________________________
> freebsd-scsi at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-scsi
> To unsubscribe, send any mail to "freebsd-scsi-unsubscribe at freebsd.org"