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[Michael Hudson-Doyle <michael.hudson+lp@xxxxxxxxxx>]

Ah wow, that's all very interesting.  Thanks for clearing things up for
me.

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https://bugs.launchpad.net/bugs/859473

Title:
  CI kernels causing many "Illegal Instruction"s

Status in LAVA Validation Lab:
  Invalid
Status in LAVA Automated Testing Framework:
  Invalid
Status in Linaro CI:
  Confirmed

Bug description:
  Recently there have been lots of validation failures for kernels from
  CI.

  These failures manifest as "Illegal Instruction" errors all over the logs
  (not just during tests, but booting as well.)

  It seems that the kernel is causing a lot of SIGILLs, but we don't know
  why yet.

  To reproduce
  ------------

  Combining

  http://ci.linaro.org/kernel_hwpack/omap3/hwpack_linaro-omap3_20111007-0028_armel_supported.tar.gz
  http://snapshots.linaro.org/11.05-daily/linaro-nano/20111005/1/images/tar/nano-n-tar-20111005-1.tar.gz

  with linaro-media-create (--rootfs ext2) should give you an image that
  shows the problem.

  Information wanted
  ------------------

  There are currently two things that we would like more information on to try
  and narrow down the cause of the problem.

  1) A core file from a crashing application

  To get this

    Create the image as described above
    Boot in to it
    Run "ulimit -c 1024"
    Run "hwclock"
    Watch it crash with "Illegal Instruction (core dumped)"
    Get that core from the filesystem.

  2) Test a defconfig build

  If this succeeds then it suggests a problem with the way that the kernel is
  being built on ci.linaro.org.

  To do this

    Get the tip of linus' tree
    Build with omap2plus_defconfig
    Boot the resulting kernel

  If that shows no SIGILL problems, then try a cross-build from an x86
  host.

  If neither of those show problems then we can concentrate on
  ci.linaro.org.

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