Date: Thu, 15 Jul 2010 13:33:39 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-stable@freebsd.org Cc: Masoom Shaikh <masoom.shaikh@gmail.com> Subject: Re: FreeBSD RELEASE-8.0-p3 panic Message-ID: <201007151333.39738.jhb@freebsd.org> In-Reply-To: <AANLkTincvGogVBN2E8U6t-5pNhgUx9OSXSsHxAAak4kH@mail.gmail.com> References: <AANLkTincvGogVBN2E8U6t-5pNhgUx9OSXSsHxAAak4kH@mail.gmail.com>
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On Thursday, July 15, 2010 1:13:05 pm Masoom Shaikh wrote: > Howdy, > > here is the image of my FreeBSD panic > http://images.cjb.net/d64f4.jpg > > the error says RAM parity error(not visible in pic). but I have > following reasons to believed it could be wrong > > 1. I have 1GB of RAM, with two chips of 512MB each. It panics even if > I boot with only 512MB of total RAM. i.e. one chip removed. It panics > for both chips individually. > 2. I tried replacing my both 512MB chips with two 512MB chips from my > friends laptop, it still panics with exact same error. RAM parity > error, it is very unlikely that his chips have this problem. He runs > Ubuntu on those chips and Windows7 with no issues whatsoever. > 3. Windows7 operates on this(my) laptop just fine. > > sometimes it take 3-4 attempts to boot it, since it panics the moment > KDM tries to load. But once running it runs few hours if I do not > subject it to load. Even moderate load like browsing some multimedia > content websites, e.g. youtube or some site with lots of flash based > ads or even some javascript heavy page like GMail etc... It appears > the moment I start subjecting the machine to load, mem usage increases > and it hits the part of RAM which might possibly have parity error. > > have a look at the pic, the frame pointer is always remains same > 0xffffffff803f1ef1. I have already asked, and again ask, is there a > way to ask FreeBSD to "ignore" some part of RAM ? how do I zero in on > the exact point of failure ? I am aware, just too many variables are > here, some wild guesses ? > > I am very sorry for my feeble OS debugging skills if any, but FreeBSD > has nothing to do with my day job, it is just a hobby for me. I > sincerely want it to work. There is a tunable you can set in the loader (vm.blacklist) to a list of physical addresses of pages that should be ignored. -- John Baldwin
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