Possible ACPI relared panic with Tyan S2720

[Peter Holm]

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

- Peter