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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1267062

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1267062

Title:
  sigaltstack system call unable to send proper return code (error12)

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  9.3.189.114 (root/.pasroot) (Host Machine)
  Run the follwoing command to go to the guest victim machine from (/var/lib/libvirt/images/jagan/new_ubuntu_alpha1)

  qemu-system-ppc64 -enable-kvm -M pseries -cpu POWER8 -smp 1 -m 10G
  -nographic -nodefaults -monitor stdio -serial pty -append
  "root=/dev/sda" -kernel trusty-server-cloudimg-ppc64el-vmlinuz-generic
  -device spapr-vscsi -device spapr-
  vlan,netdev=net0,mac=6c:ae:8b:69:16:15 -netdev
  bridge,br=virbr0,id=net0 -drive file=trusty-server-cloudimg-
  ppc64el.img.qcow2

  after this command you will get the screen number.
  example:

  QEMU 1.6.0 monitor - type 'help' for more information
  (qemu) char device redirected to /dev/pts/16 (label serial0)

  Then open another host session and execute the below command

  # screen /dev/pts/16
  (qemu)

  Here the screen number is  /dev/pts/16

  -->>Then you will get a blank screen so press ENTER key.

  The guest machine login: ubuntu/passw0rd

  Then do --->sudo -i

  Environment:
  ===========
  Host: Power8
  Guest : ubuntu hosted on Power8
  The issue:
  ======
  sigaltstack system call unable send proper return value.

  
  How to run :
  ========
  -->cd /root/ltp-full-20130904/testcases/kernel/syscalls/sigaltstack

  --> ./sigaltstack02  ==> Getting the below error

  sigaltstack02    1  TPASS  :  stgaltstack() fails, Invalid Flag value, errno:22
  sigaltstack02    2  TFAIL  :  sigaltstack() returned 0, expected -1, errno:12 =====>> FAIL

  <<<test_start>>>
  tag=sigaltstack02 stime=1386653793
  cmdline="sigaltstack02"
  contacts=""
  analysis=exit
  <<<test_output>>>
  sigaltstack02    1  TPASS  :  stgaltstack() fails, Invalid Flag value, errno:22
  sigaltstack02    2  TFAIL  :  sigaltstack() returned 0, expected -1, errno:12
  <<<execution_status>>>
  initiation_status="ok"
  duration=0 termination_type=exited termination_id=1 corefile=no
  cutime=0 cstime=0
  <<<test_end>>>

  sigaltstack() should fail and set errno to ENOMEM when the size of alternate stack area is less than MINSIGSTKSZ.
  But here its sigaltstack() is returning 0.

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