kern/91160: system hangs with: mpt0: Request 0xffffffff89b96de0 Timed out.

[Daniel Lang]

>Number:         91160
>Category:       kern
>Synopsis:       system hangs with: mpt0: Request 0xffffffff89b96de0 Timed out.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jan 01 10:50:02 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Daniel Lang
>Release:        FreeBSD-6.0/amd64
>Organization:
LEO
>Environment:
currently not available, well be amended as soon as access
has been restored.         
>Description:
The machine hangs and is unresponsive.

On the console a lot messages similar to:

[..]
mpt0: Request 0xffffffff89b966d8 Timed out.
mpt0: Request 0xffffffff89b962e8 Timed out.
mpt0: Request 0xffffffff89b974a0 Timed out.
mpt0: Request 0xffffffff89b960a8 Timed out.
mpt0: Request 0xffffffff89b96d08 Timed out.
mpt0: Request 0xffffffff89b96de0 Timed out.
mpt0: Timedout requests already complete. Interrupts may not be functioning.
[..]

The hardware is Sun V20z (Dual Opteron Machine) running
FreeBSD 6.0/amd64 using a SMP GENERIC kernel (save different ident).

I have geom-mirror enabled on the box. The problem appeared only
after the geom-mirror was created.

Currently I cannot access the machine, because over the holidays
no one is there to reset it. :)

I will enable kernel-debugging features when I have access
agin.
>How-To-Repeat:
n/a
>Fix:
n/a
>Release-Note:
>Audit-Trail:
>Unformatted: