Comment 34 for bug 1304754

Hi Matt,

Can you please post the output of dmesg, that is the canonical way to
diagnose this issue atm.

On Thu, Jul 10, 2014 at 5:23 AM, Matt Bruzek
<email address hidden> wrote:
> I installed the debian packages from the CI server http://juju-ci.vapour.ws:8080/job/publish-revision/588/
> My understanding is these deb packages were built with the PPA toolchain that has the fix installed.
>
> I destroyed the environment, rebooted the machine (for good measure) and
> find that I still get an error.
>
> https://pastebin.canonical.com/113210/
>
> Are we sure this fixes the problem?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1304754
>
> Title:
> gccgo has issues when page size is not 4kB
>
> Status in The GNU Compiler Collection:
> Fix Released
> Status in “gcc-4.9” package in Ubuntu:
> Fix Released
> Status in “gccgo-4.9” package in Ubuntu:
> Invalid
> Status in “gcc-4.9” source package in Trusty:
> Invalid
> Status in “gccgo-4.9” source package in Trusty:
> Fix Committed
> Status in “gcc-4.9” source package in Utopic:
> Fix Released
> Status in “gccgo-4.9” source package in Utopic:
> Invalid
>
> Bug description:
> On kernels 3.13-18 and 3.13-23 (there may be others) the kernel is
> killing gccgo compiled binaries
>
> [18519.444748] jujud[19277]: bad frame in setup_rt_frame:
> 0000000000000000 nip 0000000000000000 lr 0000000000000000
> [18519.673632] init: juju-agent-ubuntu-local main process (19220)
> killed by SEGV signal
> [18519.673651] init: juju-agent-ubuntu-local main process ended, respawning
>
> In powerpc/kernel/signal_64.c:
>
> sys_rt_sigreturn is jumping to the badframe: label and executing an
> unconditional force_sigsegv which is delivered to the userland
> process. Like C++, gccgo tries to decode SIGSEGV as a nil pointer
> access and blame some random function that happened to be the top
> stack frame.
>
> Reverting to the 3.13-08 kernel appears to resolve the issue which
> (weakly) points the finger at the recent switch to 64k pages.
>
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