Re: panic: Memory modified after free

On Sat, 4 Feb 2006, Steve Kargl wrote:

On Sat, Feb 04, 2006 at 09:51:32PM -0800, Doug White wrote:
Sorry for the late response on this, but I just debugged similar issues on
a Tyan S2892. The problem there was that the system would panic in unusual
places under load. The root cause was that the BIOS was not down-clocking
the DIMM speeds under high-load situations (e.g, all DIMM slots
populated), which caused random memory corruption. Updating to BIOS v2.00
fixed the problem.

Make sure you are running BIOS v3.04 or later on your S2882. The BIOS
download for that motherboard is:

http://www.tyan.com/support/html/b_s2882.html

The other option is to remove DIMMs from the system.


Updating the bios is the first thing I did. IIRC, I'm at 3.05.
The "Memory modified after free" is a real problem somewhere
deep inside devfs. See cognet's last commit to tty_pty.c.

However, I'll look into the DIMM timing issues because I have
been experiencing some lock-ups (not panics) when my system
is under heavy load. I've tested the memory with memtest86+
more than once, and it appears to be good.

ok, if its reproducible, then I'll *** out. I wasted a week tracking the
bad memory timing issue, so tyan opteron problem nails are getting a whack
with my upgrade-BIOS hammer. :)

--
Doug White | FreeBSD: The Power to Serve
dwhite@xxxxxxxxxxxxx | www.FreeBSD.org
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