I am able to reproduce this by cloning a sparc VM running jaunty and
performing an update to karmic. The VM crashes in the middle of the
update. The system is then not bootable without the same crash when
starting init.

I was able to get to a shell (by adding init=/bin/bash to my boot
options). It does not appear that init is leaving a core dump.

I was able to get some kernel-level debug information using the magic
sysreq key. I have attached a long dump of this data.

Let me know if there are any further steps I can take to help fix this.
While I am aware that sparc is not one of Ubuntu's supported
architectures, there is a community of Ubuntu users running on sparc,
and it would be useful to address his issue.

** Attachment added: "upstart-crash-sparc.txt"
   http://launchpadlibrarian.net/32456431/upstart-crash-sparc.txt

-- 
upstart doesn't boot on sparc
https://bugs.launchpad.net/bugs/436758
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