Interrupt (SCSI?) hang on 4.x

[John Baldwin]

On Tuesday 02 January 2007 10:36, Jeremy Chadwick wrote:
> Yes, I know 4.11 is EOL'd at the end of this month, but hopefully
> someone can shed some light on this problem anyways.  I simply don't
> have the knowledge of what's going on on a low-level to determine
> the cause.
> 
> I do have serial console on this box, and after enabling some
> debugging for the ahc(4) driver a few months back, was able to
> get something intelligent out of the system regarding SCBs this
> morning.  This may not be useful (or the cause), though.  I also
> cannot enable drop-to-DDB-on-serial-break because our Portmaster 2
> has been known to send a serial break on rare occasion.  :-(
> 
> Every so often (sometimes hours, sometimes months -- usually months),
> the 4.11 box we have "locks up" in the sense that both NICs on the
> box stop working, and the SCSI controller also appears hung.  This
> problem has existed for a couple years; it's not specific to 4.11
> (versus 4.10 or 4.9).

Can you try a RELENG_4 kernel?  I know of at least one fix (in 
sys/i386/isa/clock.c) since 4.11 was released that might help you out.

-- 
John Baldwin