[Bug 1415917] Re: Hardware watchpoints not working on ppc64le guests running on Ubuntu 14.10 host

[bugproxy]

** Tags removed: architecture-ppc64 targetmilestone-inin---
** Tags added: architecture-ppc64le targetmilestone-inin1410

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https://bugs.launchpad.net/bugs/1415917

Title:
  Hardware watchpoints not working on ppc64le guests running on Ubuntu
  14.10 host

Status in gdb package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Edjunior Barbosa Machado <emachado at br.ibm.com> - 2015-01-26 06:38:42 ==
  GDB hw watchpoints don't work on ppc64le VMs running on top of Ubuntu 14.10 Power8 host (sid.ltc.br.ibm.com). It fails quietly, ptrace calls and dmesg output display no error message.

  Tested on guests running different distros, kernel and  gdb versions
  (distro's packages and upstream). Unfortunately, I couldn't find any
  other Ubuntu 14.10 host to double check the problem, but it worked OK
  in other hosts I've tried.

  Steps to reproduce:

  $ cat test.c 
  int a;
  main(void)
  {
  a++;
  }

  $ gcc -g test.c -o test

  $ gdb ./test 
  GNU gdb (Ubuntu 7.8.1-1ubuntu2) 7.8.1
  ...
  Reading symbols from ./test...done.
  (gdb) watch a
  Hardware watchpoint 1: a
  (gdb) run
  Starting program: /home/emachado/test 
  [Inferior 1 (process 8179) exited with code 0134]
  (gdb) 

  Curiously, in the host it works as expected:

  $ gdb ./test 
  GNU gdb (Ubuntu 7.8-1ubuntu4) 7.8.0.20141001-cvs
  ...
  Reading symbols from ./test...done.
  (gdb) watch a
  Hardware watchpoint 1: a
  (gdb) r
  Starting program: /home/emachado/test 
  Hardware watchpoint 1: a

  Old value = 0
  New value = 1
  main () at test.c:5
  5       }
  (gdb)

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