touch-packages team mailing list archive

[Matt Bruzek <matthew.bruzek@xxxxxxxxxxxxx>]

I believe the gccgo 4.9.1 compiler fix is a good thing.  After
rebuilding Juju with gccgo-4.9_4.9.1-1ubuntu3_ppc64el.deb I was unable
to get the "juju ssh" problem I had seen previously.  I also did some
load testing on juju with multiple bootstrap, deploy, and destroy cycles
without any juju related problems.

See https://bugs.launchpad.net/ubuntu/+source/juju-core/+bug/1347322
Comment #7 for the details of how we built with the gccgo 4.9.1
compiler.

Thanks.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gccgo-4.9 in Ubuntu.
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:
  In Progress
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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