r270287: crash

Garrett Cooper yaneurabeya at gmail.com
Thu Aug 21 20:47:12 UTC 2014

On Thu, Aug 21, 2014 at 12:32 PM,  <yaneurabeya at gmail.com> wrote:
> On Aug 21, 2014, at 12:26 PM, O. Hartmann <ohartman at zedat.fu-berlin.de> wrote:
>> FreeBSD r270287 crashes/reboots instantanously on loading the kernel. I
>> can not see at what point (on modern systems like Ivy Bridge). On older
>> Core2Duo systems I get a trap 12 in APIC or similar.
>> While I was able to start kernel.old on the modern systems, I fail on
>> both kernel and kernel.old on the C2D system.
>> I'd like to know whether there is a way to save the system I can not
>> reboot the on-disk kernels snce they are, woderfull, compromised.
>> Is there a possible scenario  like:
>> a) boot from DVD ROM or USB most recent snapshot
>> b) establish network with on-disk config, svn checkout recent sources
>> into on-disk file hierarchy
>> c) build repaired/patched kernel and install on on-disk (not on the
>> emergency boot media).
> I would grab a snapshot ISO or USB disk image: ftp://ftp.freebsd.org/pub/FreeBSD/snapshots/amd64/amd64/ISO-IMAGES/11.0/ . After that you can mount your filesystems, revert to an earlier SVN revision, and repair your system that way. You could also copy over the  /boot/kernel as long as you didn’t have/need any customizations.
>> Thanks, help appreciated and what is about this crash affecting recent
>> CURRENT r270287, what has corrupted the system?
> That’s a better question. Booting off newer sources worked on my VM at least, but it’s not real hardware. Maybe something dealing with vt(4)/xen?

    One important note is that my CURRENT VM on my Macbook runs i386, not amd64.

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