LSI 9200-8e/gmultipath/ZFS cable pull kernel crash

[John De Boskey]

----- Matthew Jacob's Original Message -----
> >dd if=/dev/zero bs=1m | mbuffer -m 64m -o /lsi/bigfile
> >
> >with mbuffer reporting the following
> >
> >in @  697 MiB/s, out @  697 MiB/s, 11.8 GiB total, buffer 100% full
> >
> >when I pull the cable. Playing with it today, I'm wondering if the
> >1st cable actually has any active providers on it (luck of the
> >draw that I pulled it first), and the 2nd has all the active
> >providers on it.  I have not explicity tried to balance the i/o
> >on the two cables with gmultipath rotate.
> >
> >Having a bit of trouble getting a good objdump of g_multipath.o
> >so I may do a new src update.

Sources are up-to-date as of revision 222104. buildworld/buildkernel.

I'll rerun tests and pull the cables.

> I had to do a wad of changes at Panasas to cover this kind of case. I have 
> had some troubles getting these changes into -head (lack of time, 
> differences from the RELENG_7 code I was working with, etc), but I think 
> that there are still issues at play here.

Do you still have changes to integrate?  Anything I can do to help? Any
best debugging practices for this area? Sorry, lots of questions. 

Thx