On Aug 21, 2014, at 12:26 PM, O. Hartmann <ohart...@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? HTH! -Garrett
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