[Bug 1580601] [NEW] __nih_abort_msg symbol cannot be read any more

Wed May 11 13:18:33 UTC 2016

Public bug reported:

libnih has a global symbol __nih_abort_msg that contains the message of
the last failed nih_assert() (similar to glibc's own __abort_msg and
glib's __glib_assert_msg). Apport uses these to produce a more
meaningful crash report than just "/bin/foo crashed with SIGABRT", as in
these case the thing you actually want to see is the assertion message.

This stopped working in yakkety/amd64. apport's
report.test_add_gdb_info_abort_libnih() now fails:

ERROR: test_add_gdb_info_abort_libnih (__main__.T)
add_gdb_info() with libnih assertion
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./test_report.py", line 886, in test_add_gdb_info_abort_libnih
    self.assertIn('Assertion failed in main: 1 < 0', pr['AssertionMessage'])
  File "/usr/lib/python3.5/collections/__init__.py", line 985, in __getitem__
    raise KeyError(key)
KeyError: 'AssertionMessage'

This can be reproduced with the attached script which compiles a trivial
nih_assert() C program, runs it, and runs gdb on the produced core dump.
Up until xenial it looks like:

$ ./nih-assert.sh 
(null):<stdin>:2: Assertion failed in main: 1 < 0
Aborted (core dumped)
[New LWP 9838]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `./nih-assert'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f28c070d418 in __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
54	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
$1 = 0x25400f0 "<stdin>:2: Assertion failed in main: 1 < 0"

But in yakkety/amd64 it now looks like

$ ./nih-assert.sh 
(null):<stdin>:2: Assertion failed in main: 1 < 0
Aborted (core dumped)
[New LWP 10489]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `./nih-assert'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007fd303865418 in __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
54	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
$1 = 0xffffffff869400f0 <error: Cannot access memory at address 0xffffffff869400f0>

This can be reproduced easily in a schroot, you need to install "libnih-dev pkg-config gdb".

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libnih-dev 1.0.3-4.3ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: i3
Date: Wed May 11 15:13:46 2016
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu3
 libgcc1 1:6.0.1-0ubuntu1
 libnih1 1.0.3-4.3ubuntu1
EcryptfsInUse: Yes
SourcePackage: libnih
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gcc-5 (Ubuntu)
     Importance: Undecided
         Status: New

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

** Tags: amd64 apport-bug regression-releasease yakkety

** Attachment added: "reproducer"
   https://bugs.launchpad.net/bugs/1580601/+attachment/4660648/+files/nih-assert.sh

** Also affects: gcc-5 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1580601

Title:
  __nih_abort_msg symbol cannot be read any more

Status in gcc-5 package in Ubuntu:
  New
Status in libnih package in Ubuntu:
  New

Bug description:
  libnih has a global symbol __nih_abort_msg that contains the message
  of the last failed nih_assert() (similar to glibc's own __abort_msg
  and glib's __glib_assert_msg). Apport uses these to produce a more
  meaningful crash report than just "/bin/foo crashed with SIGABRT", as
  in these case the thing you actually want to see is the assertion
  message.

  This stopped working in yakkety/amd64. apport's
  report.test_add_gdb_info_abort_libnih() now fails:

  ERROR: test_add_gdb_info_abort_libnih (__main__.T)
  add_gdb_info() with libnih assertion
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "./test_report.py", line 886, in test_add_gdb_info_abort_libnih
      self.assertIn('Assertion failed in main: 1 < 0', pr['AssertionMessage'])
    File "/usr/lib/python3.5/collections/__init__.py", line 985, in __getitem__
      raise KeyError(key)
  KeyError: 'AssertionMessage'

  This can be reproduced with the attached script which compiles a
  trivial nih_assert() C program, runs it, and runs gdb on the produced
  core dump. Up until xenial it looks like:

  $ ./nih-assert.sh 
  (null):<stdin>:2: Assertion failed in main: 1 < 0
  Aborted (core dumped)
  [New LWP 9838]
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  Core was generated by `./nih-assert'.
  Program terminated with signal SIGABRT, Aborted.
  #0  0x00007f28c070d418 in __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
  54	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
  $1 = 0x25400f0 "<stdin>:2: Assertion failed in main: 1 < 0"

  But in yakkety/amd64 it now looks like

  $ ./nih-assert.sh 
  (null):<stdin>:2: Assertion failed in main: 1 < 0
  Aborted (core dumped)
  [New LWP 10489]
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  Core was generated by `./nih-assert'.
  Program terminated with signal SIGABRT, Aborted.
  #0  0x00007fd303865418 in __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
  54	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
  $1 = 0xffffffff869400f0 <error: Cannot access memory at address 0xffffffff869400f0>

  This can be reproduced easily in a schroot, you need to install "libnih-dev pkg-config gdb".

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: libnih-dev 1.0.3-4.3ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: i3
  Date: Wed May 11 15:13:46 2016
  Dependencies:
   gcc-6-base 6.0.1-0ubuntu1
   libc6 2.23-0ubuntu3
   libgcc1 1:6.0.1-0ubuntu1
   libnih1 1.0.3-4.3ubuntu1
  EcryptfsInUse: Yes
  SourcePackage: libnih
  UpgradeStatus: No upgrade log present (probably fresh install)

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