Date: Tue, 05 Oct 2010 02:18:27 -0700 From: Dave Hayes <dave@jetcafe.org> To: Alan Cox <alc@rice.edu> Cc: alc@freebsd.org, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Panic: attempted pmap_enter on 2MB page Message-ID: <201010050918.o959IR05065727@hugeraid.jetcafe.org> In-Reply-To: <4CAABCFD.6050709@rice.edu> References: <201010030211.o932Bd4C048116@hugeraid.jetcafe.org> <AANLkTikenQoA7UBo_N3bzQJ9ABJSTGL89_Qda_Tu7Wa0@mail.gmail.com> <201010040512.o945CTor092854@hugeraid.jetcafe.org> <4CAABCFD.6050709@rice.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
Alan Cox <alc@rice.edu> writes: > There are two pieces of information that might be helpful: the value of > the global variable "kernel_vm_end" and the virtual address that was > passed to pmap_enter(). I'm afraid I don't have enough experience with this debugger to get these values with offhand commands. I could trial and error my way through figuring it out, but I'd rather get the data you expect. :) If you could give me the commands to do this, I'd be happy to type them in and get a response to you. > Is this problem reproducible? I don't recall if you mentioned that > earlier. Sort of. It seems that everytime I generate a bootable FreeBSD ISO, a die is rolled. If it comes up a certain number then it crashes, otherwise it's fine. ;) My ISO generation process might be relevant; I create a 600MB ramdisk (it used to be 512 on FreeBSD 7.3) which loads from the ISO on boot. This winds up being the root partition. As a datapoint the same die roll happens on FreeBSD 7.3 although the chance of working seems to be greater. If you'd like a copy of the ISO to see this for yourself I can make it available. I'm guessing it will also crash for you in this way modulo hardware issues. -- Dave Hayes - Consultant - Altadena CA, USA - dave@jetcafe.org >>> The opinions expressed above are entirely my own <<< The treasure house within you contains everything, and you are free to use it. You don't need to seek outside.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201010050918.o959IR05065727>