[Bug 958305] Re: nscd crashed with SIGSEGV in _nss_files_init()

[Daniel J Blueman]

Better, I followed [https://wiki.ubuntu.com/Bugs/HowToFix] and prepared
and backported the minimal fix as suggested by Alessandro Menti and
attached the bzr branch:

https://code.launchpad.net/~inquisitor/ubuntu/precise/unscd/fix-
for-958305/

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Title:
  nscd crashed with SIGSEGV in _nss_files_init()

Status in “eglibc” package in Ubuntu:
  Invalid
Status in “unscd” package in Ubuntu:
  Fix Released
Status in “eglibc” source package in Precise:
  Invalid
Status in “unscd” source package in Precise:
  Confirmed

Bug description:
  Clean x86-64 install of precise as of 2012-03-17; unscd is hit with
  SEGV whenever it starts, ie 100% reproducability.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: unscd 0.47-2build2
  ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
  Uname: Linux 3.2.0-19-generic x86_64
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: amd64
  Date: Sun Mar 18 11:18:59 2012
  Disassembly: => 0x1:	Cannot access memory at address 0x1
  ExecutablePath: /usr/sbin/nscd
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120316)
  ProcCmdline: /usr/sbin/nscd
  ProcEnviron:
   LANGUAGE=en_SG:en
   TERM=linux
   LANG=en_SG.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x1:	Cannot access memory at address 0x1
   PC (0x00000001) not located in a known VMA region (needed executable region)!
  SegvReason: executing NULL VMA
  Signal: 11
  SourcePackage: unscd
  StacktraceTop:
   ?? ()
   _nss_files_init (cb=0x1) at nss_files/files-init.c:47
   nss_load_library (ni=<optimized out>) at nsswitch.c:412
   nss_load_all_libraries (def=0x7f03dd560b74 "dns [!UNAVAIL=return] files", service=0x7f03dd560b90 "hosts") at nsswitch.c:875
   __nss_disable_nscd (cb=<optimized out>) at nsswitch.c:895
  Title: nscd crashed with SIGSEGV in _nss_files_init()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  unscd 0.48 fixes just this issue (see patch delta below) and is already released in Quantal, so is a candidate fix for this issue in Precise:
  http://archive.ubuntu.com/ubuntu/pool/universe/u/unscd/

  http://archive.ubuntu.com/ubuntu/pool/universe/u/unscd/unscd_0.48-2_amd64.deb
  http://archive.ubuntu.com/ubuntu/pool/universe/u/unscd/unscd_0.48-2_i386.deb

  I have verified this here and it addresses the issue. SRU justification:
  [Impact] unscd-0.47 crashes each time it is started, thus is useless and obtrusive
  [Test Case] start unscd-0.47: sudo /etc/init.d/unscd start
  [Regression Potential] None due to existing crasher

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