9.3-RELEASE still instapanics on multi-mps(4) servers

[Bengt Ahlgren]

Garrett Wollman <wollman at bimajority.org> writes:

> Remember about six months ago when I tested 9-stable on one of my big
> NFS servers, and had it panic in the middle of the USB probe, but
> ultimately bisected the problem to an update to the mps(4) driver?  I
> had to stop investigating and get the server working (which I did, by
> installing 9.2 instead of something newer and presumably faster).  I'm
> at the point now where I'd like to upgrade my file servers to 9.3, and
> I can't, because of this issue, so it's time to start tracking down
> the bug again.
>
> I have two test servers now.  9.3 works just fine on one of them, and
> panics on the other.  The one it works on is slightly older, and has
> an mpt(4) controller for the boot drives, as opposed to the system
> where the panic happens, which is mps(4)-only.  Both systems have two
> SAS2116 controllers for external drives; the ones on the working
> system have drives attached, and the ones on the non-working system
> are not connected to anything (and in fact disabled in the BIOS for
> now).
>
> Any experts want to suggest where to start (besides, obviously,
> attaching a serial console, which I haven't done yet)?  I saw one
> change in the svn logs for 9.3 prior to the release which looked like
> it might be a relevant fix, but it clearly hasn't improved anything
> for my servers.

I have a dual-mps (one Dell H200 and one LSI 9207) system now running
9.1 (w patched sys/kern/kern_intr.c) that I intend to upgrade to 9.3
shortly.  Is it enough to boot a 9.3 memstick to provoke the issue?

Bengt