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

[Tom Worley]

I am also affected by this bug (dual Opteron 12 core 6238), but when starting /etc/init.d/xcp-xapi
Fresh install of Ubuntu 12.04

About to try the cpuid_mask_ext_ecx fix. 
Adam: I'll test the backport if you need?

# /etc/init.d/xcp-xapi start
Error: Connection refused (calling connect )

syslog:
Jun 19 14:17:08 host1 xapi: [ info|host1|0 thread_zero||watchdog] (Re)starting xapi...
Jun 19 14:17:08 host1 kernel: [ 8209.795675] xapi[32494] trap invalid opcode ip:7f8fe3cbae11 sp:7fff711645c0 error:0 in libm-2.15.so[7f8fe3c78000+f9000]
Jun 19 14:17:09 host1 kernel: [ 8210.027119] apport[32496] trap invalid opcode ip:7ff62e2625fc sp:7fffe5a49970 error:0 in libm-2.15.so[7ff62e220000+f9000]
Jun 19 14:17:09 host1 kernel: [ 8210.027231] Process 32496(apport) has RLIMIT_CORE set to 1
Jun 19 14:17:09 host1 kernel: [ 8210.027245] Aborting core
Jun 19 14:17:09 host1 xcp-fe: 32494 (/usr/sbin/xapi -nowatchdog -writereadyfile /var/run/xapi_startup.cookie -writ...) exitted with signal -5
Jun 19 14:17:09 host1 xapi: [ info|host1|0 thread_zero||watchdog] received signal -5
Jun 19 14:17:09 host1 xapi: [ info|host1|0 thread_zero||watchdog] xapi watchdog exiting.
Jun 19 14:17:09 host1 xapi: [ info|host1|0 thread_zero||watchdog] Fatal: xapi died with signal -5: not restarting (watchdog never restarts on this signal)

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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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