[Bug 1423909] Comment bridged from LTC Bugzilla

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------- Comment From pavsubra at in.ibm.com 2015-02-23 12:42 EDT-------
The original problem occurred with the below firmware:

root at ubuntu:~# lsmcode
Version of System Firmware is FW820.02 (TC820_048) (t) FW820.02 (TC820_048) (p) FW820.02 (TC820_048) (b)
Version of PFW is 15392014103181CF0681

Again I have executed the test scenario on a LPAR which has the below
firmware level and the gcc-4.9 got build successfully.

root at ubuntu:~# lsmcode
Version of System Firmware is FW830.00 (TV830_012) (t) FW830.00 (TV830_012) (p) FW830.00 (TV830_012) (b)
Version of PFW is 13382014112881CF0681

So, the issue is not occurring with the latest Firmware levels on a
Power 8 machine.

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https://bugs.launchpad.net/bugs/1423909

Title:
  gcc-4.9 source package building hangs indefinitely

Status in gcc-4.9 package in Ubuntu:
  New

Bug description:
  == Comment: #0 - PAVAMAN SUBRAMANIYAM <pavsubra at in.ibm.com> - 2015-02-19 04:12:21 ==
  ---Problem Description---
  gcc-4.9 source package building hangs indefinitely
   
  Contact Information = pavsubra at in.ibm.com 
   
  ---uname output---
  Linux ltcbrazos1-lp02.austin.ibm.com 3.18.0-13-generic #14-Ubuntu SMP Fri Feb 6 09:57:41 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
   
  Machine Type = P8 
   
  ---System Hang---
  The system just stalls and not able to get to the login prompt or do ssh.
  We have to reboot the LPAR from the HMC.
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
  Install a P8 LPAR with Ubuntu 15.04 ISO.
  Then download the gcc-4.9 source as below and try to build the same.

  root at ubuntu:~# apt-get source gcc-4.9
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  NOTICE: 'gcc-4.9' packaging is maintained in the 'Svn' version control system at:
  svn://anonscm.debian.org/gcccvs/branches/sid/gcc-4.9
  Need to get 72.8 MB of source archives.
  Get:1 http://archive.ubuntu.com/ubuntu/ vivid/main gcc-4.9 4.9.2-10ubuntu5 (dsc) [21.4 kB]
  Get:2 http://archive.ubuntu.com/ubuntu/ vivid/main gcc-4.9 4.9.2-10ubuntu5 (tar) [71.7 MB]
  Get:3 http://archive.ubuntu.com/ubuntu/ vivid/main gcc-4.9 4.9.2-10ubuntu5 (diff) [984 kB]
  Fetched 72.8 MB in 2min 14s (540 kB/s)
  gpgv: Signature made Wed 04 Feb 2015 05:56:09 PM CST using RSA key ID 778FA6F5
  gpgv: Can't check signature: public key not found
  dpkg-source: warning: failed to verify signature on ./gcc-4.9_4.9.2-10ubuntu5.dsc
  dpkg-source: info: extracting gcc-4.9 in gcc-4.9-4.9.2
  dpkg-source: info: unpacking gcc-4.9_4.9.2.orig.tar.gz
  dpkg-source: info: applying gcc-4.9_4.9.2-10ubuntu5.diff.gz

  root at ubuntu:~# cd gcc-4.9-4.9.2/
  root at ubuntu:~/gcc-4.9-4.9.2# dpkg-buildpackage -b

  WARNING: program timed out.
  FAIL: gcc.c-torture/execute/builtin-prefetch-6.c compilation,  -Og -g
  WARNING: program timed out.
  FAIL: 23_containers/unordered_set/erase/1.cc (test for excess errors)
  WARNING: program timed out.
  FAIL: gcc.c-torture/execute/builtin-prefetch-6.c compilation,  -O2 -flto -fno-use-linker-plugin -flto-partition=none
  WARNING: program timed out.
  FAIL: gcc.c-torture/execute/builtin-prefetch-6.c compilation,  -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects
  WARNING: program timed out.
  FAIL: 23_containers/unordered_set/erase/24061-set.cc (test for excess errors)
  WARNING: program timed out.

  While compiling and executing the tests the machine hangs indefinitely.
   
  Userspace tool common name: /usr/bin/gcc 
   
  The userspace tool has the following bit modes: 64-bit 

  Userspace rpm: gcc-4.9 4.9.2-10ubuntu5

  
  == Comment: #4 - Peter E. Bergner <bergner at us.ibm.com> - 2015-02-19 08:14:54 ==
  When building a userland package causes the kernel to hang, that is a kernel bug, not a userland bug.

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