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[U JAGAN MOHAN <jamohan2@xxxxxxxxxx>]

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

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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:
  Confirmed

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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