Possible ACPI relared panic with Tyan S2720

[John Baldwin]

On Tuesday 05 June 2007 12:37:58 am Peter Holm wrote:
> On Mon, Jun 04, 2007 at 12:45:23PM -0700, Nate Lawson wrote:
> > Peter Holm wrote:
> > > I have a panic that comes and go. Kostik has helped me narrow the
> > > problem down to AcpiOsWritePort().
> > > 
> > > It is not a problem for me, as there are various was to work around
> > > it.
> > > 
> > > More info can be found here: http://people.freebsd.org/~pho/acpi.html
> > 
> > Thanks for all your debugging effort.
> > 
> 
> You are welcome :-)
> 
> > This is a really confusing issue.  All the trace you have shows is that
> > it occurs while transitioning the system from legacy to ACPI mode.
> > Unfortunately, the details of what is going on are hidden in the BIOS
> > since that write to a port triggers an SMI and the BIOS does the rest.
> > 
> > However, it seems like the BIOS is reserving more memory, using memory
> > it didn't reserve, or FreeBSD is using memory we shouldn't.  John, any
> > insight on the SMAP output?
> > 
> > > SMAP type=01 base=0000000000000000 len=000000000009fc00
> > > SMAP type=02 base=000000000009fc00 len=0000000000000400
> > > SMAP type=02 base=00000000000e0000 len=0000000000020000
> > > SMAP type=01 base=0000000000100000 len=000000003fef0000
> > > SMAP type=03 base=000000003fff0000 len=000000000000f000
> > > SMAP type=04 base=000000003ffff000 len=0000000000001000
> > > SMAP type=02 base=00000000fec00000 len=0000000000100000
> > > SMAP type=02 base=00000000fee00000 len=0000000000001000
> > > SMAP type=02 base=00000000fff80000 len=0000000000080000
> > 
> > Peter, can you figure out what phys address is getting overwritten?
> > Seems like it's the loader that sets up the module list and the loader's
> > allocator may be using RAM it shouldn't.
> > 
> 
> If I did it right (I used a vtophys() on the address):
> 
> Address of mod->name(if_tun): 0xc3eed5ec, phys: 0x985ec

Is name a malloc'd variable?  That might explain the low address.  Perhaps we 
aren't properly respecting the top of high memory stuff from the BIOS when 
using SMAP?

-- 
John Baldwin