Date: Sat, 4 Feb 2006 22:15:56 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Doug White <dwhite@gumbysoft.com> Cc: freebsd-current@freebsd.org Subject: Re: panic: Memory modified after free Message-ID: <20060205061556.GA4551@troutmask.apl.washington.edu> In-Reply-To: <20060204214535.S45494@carver.gumbysoft.com> References: <20060131212209.GA870@troutmask.apl.washington.edu> <20060201010157.GA604@troutmask.apl.washington.edu> <20060201042122.GA27796@troutmask.apl.washington.edu> <20060204214535.S45494@carver.gumbysoft.com>
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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. -- Steve
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