[Bug 1427981] [NEW] pthread_join failure

[Peng Tao]

Public bug reported:

pthread_join() appears to behave differently depending on gcc
optimization is on or off. Build the attached source file with gcc -O2
or gcc -O0 has shown different joining results.

E.g., with `gcc pthread_join.c -lpthread -g -O2` it passes without
issue.

with `gcc pthread_join.c -lpthread -g -O0`, the program fails at
pthread_join() with ESRCH.

The same does not happen on other distros (tested on CentOS and Fedora).

Some additional info:

[macbeth at tests]$cat /etc/issue
Ubuntu 14.04 LTS \n \l

[macbeth at tests]$gcc --version
gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[macbeth at tests]$dpkg -l libc6
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                   Version                  Architecture             Description
+++-======================================-========================-========================-==================================================================================
ii  libc6:amd64                            2.19-0ubuntu6            amd64                    Embedded GNU C Library: Shared libraries

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "test program"
   https://bugs.launchpad.net/bugs/1427981/+attachment/4334048/+files/pthread_join.c

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https://bugs.launchpad.net/bugs/1427981

Title:
  pthread_join failure

Status in glibc package in Ubuntu:
  New

Bug description:
  pthread_join() appears to behave differently depending on gcc
  optimization is on or off. Build the attached source file with gcc -O2
  or gcc -O0 has shown different joining results.

  E.g., with `gcc pthread_join.c -lpthread -g -O2` it passes without
  issue.

  with `gcc pthread_join.c -lpthread -g -O0`, the program fails at
  pthread_join() with ESRCH.

  The same does not happen on other distros (tested on CentOS and
  Fedora).

  Some additional info:

  [macbeth at tests]$cat /etc/issue
  Ubuntu 14.04 LTS \n \l

  [macbeth at tests]$gcc --version
  gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
  Copyright (C) 2013 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions.  There is NO
  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

  [macbeth at tests]$dpkg -l libc6
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                                   Version                  Architecture             Description
  +++-======================================-========================-========================-==================================================================================
  ii  libc6:amd64                            2.19-0ubuntu6            amd64                    Embedded GNU C Library: Shared libraries

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