[Bug 956051] Re: libc6 crash while running 'xm'

[Kenny Millington]

Attached is a debdiff for the patch proposed in comment #7 by jwestfall:
disabling FMA4 if AVX support is unavailable.

A package containing this patch has been pushed to my lpbugs PPA at:
https://launchpad.net/~kmdm/+archive/lpbugs/

IMPORTANT NOTE: This is *UNTESTED* since due to commercial constraints
we had to re-image our affected server hardware to a 32-bit installation
and so no longer have the ability to perform adequate testing.

** Patch added: "LP956051.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/956051/+attachment/3167651/+files/LP956051.debdiff

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https://bugs.launchpad.net/bugs/956051

Title:
  libc6 crash while running 'xm'

Status in “eglibc” package in Ubuntu:
  Confirmed
Status in “eglibc” source package in Precise:
  Confirmed

Bug description:
  Ubuntu Version: 12.04 (precise)

  libc6: 2.15-0ubuntu5
  xen-hypervisor-4.1-amd64: 4.1.2-2ubuntu2
  linux-image-generic: 3.2.0.18.20

  Everytime I try to run 'xm list' on a new AMD Opteron 6274 system (Bulldozer architecture) I'm getting a crash.
  I couldn't even file a bug report through "apport-bug".
  Repeating the same procedure with Ubuntu Oneiric showed no problems at all.

  dmesg showed following messages:

  [  479.891581] xm[1746] trap invalid opcode ip:7fd684f8a5fc sp:7fff3ebb3c70 error:0 in libm-2.15.so[7fd684f48000+f9000]
  [  479.937611] apport[1758] trap invalid opcode ip:7fd6cb9ea5fc sp:7fff9bbc06b0 error:0 in libm-2.15.so[7fd6cb9a8000+f9000]
  [  479.937641] Process 1758(apport) has RLIMIT_CORE set to 1
  [  479.937645] Aborting core

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