[Bug 1187876] Re: rsyslog stuck in 'spawned': Error in `rsyslogd': malloc(): memory corruption: 0x00000000007b2930

[Steve Langasek]

The process somehow gets wedged in libc's malloc error handler.  gdb
probably isn't going to pinpoint the source of the corruption.  valgrind
instead shows:

# valgrind rsyslogd -c5
==5249== Memcheck, a memory error detector
==5249== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==5249== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==5249== Command: rsyslogd -c5
==5249== 
==5249== Invalid write of size 1
==5249==    at 0x557BA89: __vsprintf_chk (vsprintf_chk.c:86)
==5249==    by 0x557B9CC: __sprintf_chk (sprintf_chk.c:32)
==5249==    by 0x40A981: queryLocalHostname (stdio2.h:33)
==5249==    by 0x40D11E: realMain (syslogd.c:2761)
==5249==    by 0x548DEA4: (below main) (libc-start.c:260)
==5249==  Address 0x58423b8 is 0 bytes after a block of size 24 alloc'd
==5249==    at 0x4C2CD7B: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==5249==    by 0x40A956: queryLocalHostname (syslogd.c:2423)
==5249==    by 0x40D11E: realMain (syslogd.c:2761)
==5249==    by 0x548DEA4: (below main) (libc-start.c:260)
==5249== 
<snip>

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https://bugs.launchpad.net/bugs/1187876

Title:
  rsyslog stuck in 'spawned': Error in `rsyslogd': malloc(): memory
  corruption: 0x00000000007b2930

Status in “rsyslog” package in Ubuntu:
  New

Bug description:
  On some physical hardware systems running raring, we're seeing cloud-config not run occasionally.
  After debugging, it seems the issue is that rsyslog is not starting.

  $ sudo status rsyslog
  rsyslog start/spawned, process 1656

  Note, its spawned, not 'running'.

  $ sudo cat /var/log/upstart/rsyslog.log 
  Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
  *** Error in `rsyslogd': malloc(): memory corruption: 0x00000000007b2930 ***

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: rsyslog 5.8.11-2ubuntu2.1
  ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
  Uname: Linux 3.8.0-23-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  Date: Wed Jun  5 13:44:50 2013
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: rsyslog
  UpgradeStatus: No upgrade log present (probably fresh install)

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