Unfortunately, the only piece of information that is of any value here is the 

	isp0: unable to setup dma (22)

lines. It's probably some breakage in isp's usage of busdma map stuff that
only gets tickled in sgmap cases.  I'll *probably* be putting up another
kernel for you to try shortly.


On Mon, 1 Jul 2002, Matthias Buelow wrote:

> Matthew Jacob wrote:
> 
> > http://people.freebsd.org/~mjacob/netbsd.gz
> > built off of Top of Tree with some diagnostic code.
> 
> Ok, I've been running your kernel and in the meantime it has
> actually caught something... unfortunately I wasn't able to
> produce a kernel corefile in ddb since I didn't have enough
> swap so I can only give you the following kernel message
> and I wasn't proficient enough with ddb to actually find out
> where it faulted (well, I didn't try hard since I thought
> I could produce a crashdump, only to find out I was rather
> short on swap...);
> Incidentally it occured when I was about to login and reboot
> the machine -- the "generic HBA error" hasn't occurred then
> for 3 days; I was glad that it _did_ happen right on time. :)
> Not much info here but it's probably better than nothing.
> 
> 
> login: root
> isp0: unable to setup dma (22)
> sd0(isp0:0:0:0): generic HBA error
> 
> CPU 0: fatal user trap:
> 
> CPU 0    trap entry = 0x2 (memory management fault)
> CPU 0    a0         = 0x1600a5c00
> CPU 0    a1         = 0x1
> CPU 0    a2         = 0xffffffffffffffff
> CPU 0    pc         = 0x1600a5c00
> CPU 0    ra         = 0x120003cc4
> CPU 0    pv         = 0x1600a5c00
> CPU 0    curproc    = 0xfffffc00077d3d10
> CPU 0        pid = 186, comm = login
> 
> isp0: unable to setup dma (22)
> sd0(isp0:0:0:0): generic HBA error
> isp0: unable to setup dma (22)
> sd0(isp0:0:0:0): generic HBA error
> Jun 28 23:23:07 digibus /netbsd: pid 186 (login), uid 0: exited on 
> signal 11 (core dumped)
> 
> 
> Since the issue seems to occur when >1GB memory is installed and since
> it seems to have something to do with DMA, I wondered if it could be
> related to Jason Thorpe's SGMAP DMA improvements he made last year,
> according to a quick scan of the port-alpha webpage.
> This is just a wild speculation and I'm probably wrong with that but
> it's an idea.
> 
> --mkb
> 
>