** Changed in: ubuntu-power-systems
       Status: New => Triaged

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  [LTC Test] Ubuntu 18.04: tm_trap_test failed on P8 compat mode guest

Status in The Ubuntu-power-systems project:
Status in linux package in Ubuntu:

Bug description:
  ---Problem Description---
  tm_trap_test failed on P8 compat mode [16.04.04 daily build as well bionic ] 
guests on a P9 host running bionic final beta version.
  Contact Information = srikanth/bssrika...@in.ibm.com 
  ---uname output---

  16.04.04 Guest running in P8compat mode:

  Linux guest 4.15.0-15-generic #16~16.04.1-Ubuntu SMP Thu Apr 5 12:18:22 UTC 
2018 ppc64le ppc64le ppc64le GNU/Linux
  18.04 guest running in P8compat mode:
  Linux ubuntu 4.15.0-15-generic #16-Ubuntu SMP Wed Apr 4 13:57:51 UTC 2018 
ppc64le ppc64le ppc64le GNU/Linux

  Machine Type = boston-LC 
  A debugger is not configured
  ---Steps to Reproduce---
   1. Log into P9 Ubuntu 18.04 host, take console of guest 
  2. Run TM selftests
  git clone --depth 1 https://github.com/torvalds/linux.git;cd 
linux/tools/testing/selftests/powerpc/;git log --oneline -1;make;make -C tm 

  We will observe one of the tm tests failing, mentioned below:

  selftests: tm-trap
  test: tm_trap_test
  tags: git_version:c18bb39
  Little-Endian machine detected. Checking if endianness flips inadvertently on 
trap in TM... yes!
  failure: tm_trap_test
  not ok 1..11 selftests:  tm-trap [FAIL]

  Expected result: All tm selftests should have been pass on the P8 compat 
guest.. giventhat we had TM workaround patches in latest Ubuntu BIONIC host 
  Stack trace output:
  Oops output:
  System Dump Info:
    The system is not configured to capture a system dump.
  *Additional Instructions for srikanth/bssrika...@in.ibm.com: 
  -Attach sysctl -a output output to the bug.

  == Comment: #2 - SRIKANTH AITHAL <bssrika...@in.ibm.com> - 2018-04-10
  01:32:00 ==

  == Comment: #3 - SRIKANTH AITHAL <bssrika...@in.ibm.com> - 2018-04-10 
01:33:41 ==

  == Comment: #4 - SRIKANTH AITHAL <bssrika...@in.ibm.com> - 2018-04-10 
01:34:02 ==

  Please pick 

   `1c200e63d055 ("powerpc/tm: Fix endianness flip on trap")`

  ie. the commit that the test was written for

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