[Bug 1220013] Re: python-apt can SIGSEGV when encountering Packages stanzas with no Description field (was: update-apt-xapian-index crashed with SIGSEGV in File())

[Julian Andres Klode]

The APT command-line code does  the same loop python-apt does. If it
fails in python-apt, APT fails as well. So in that case, the best idea
might be to change APT by overriding end() to do the checks isGood()
does, so all clients work correctly. This would require a rebuild of all
reverse dependencies though, and is formally an ABI break.

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https://bugs.launchpad.net/bugs/1220013

Title:
  python-apt can SIGSEGV when encountering Packages stanzas with no
  Description field (was: update-apt-xapian-index crashed with SIGSEGV
  in File())

Status in “apt” package in Ubuntu:
  Confirmed
Status in “apt-xapian-index” package in Ubuntu:
  Confirmed
Status in “python-apt” package in Ubuntu:
  Confirmed

Bug description:
  Errors Bucket:
  http://errors.ubuntu.com/bug/1220013

  There are 600+ reports of this on errors.ubuntu.com.

  Something wrong

  ProblemType: CrashDistroRelease: Ubuntu 13.10
  Package: apt-xapian-index 0.45ubuntu2
  ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7
  Uname: Linux 3.11.0-4-generic i686
  ApportVersion: 2.12.1-0ubuntu3
  Architecture: i386
  CrashCounter: 1
  Date: Tue Sep  3 01:23:23 2013
  ExecutablePath: /usr/sbin/update-apt-xapian-index
  InterpreterPath: /usr/bin/python2.7
  MarkForUpload: True
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/sbin/update-apt-xapian-index --quiet
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   SHELL=/bin/sh
  SegvAnalysis:
   Segfault happened at: 0xb6c9e020:	imul   $0x3c,(%eax),%ebp
   PC (0xb6c9e020) ok
   source "$0x3c" ok
   destination "(%eax)" (0xd7ac1000) not located in a known VMA region (needed writable region)!
  SegvReason: writing unknown VMA
  Signal: 11SourcePackage: apt-xapian-index
  StacktraceTop:
   ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so
   ?? ()
   PyObject_GetAttr ()
   PyEval_EvalFrameEx ()
   ?? ()
  Title: update-apt-xapian-index crashed with SIGSEGV in PyObject_GetAttr()
  UpgradeStatus: Upgraded to saucy on 2013-08-16 (17 days ago)
  UserGroups:

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