[Bug 842676] Re: aptd crashed with SIGSEGV in pkgProblemResolver::MakeScores()

[Julian Andres Klode]

Two options:

(a) If we release the GIL, and call pkgAllUpgrade(), pkgAllUpgrade() can
modify the depCache. If now another (Python)-thread accesses the
depcache, we're lost (and that's potentially a real bug, given that APT
is almost totally not thread-safe).

(b) The cache file is broken - we rule out too short cache files now, as
that is detected since August 2011, so it can basically only be caused
by a broken storage or memory.

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https://bugs.launchpad.net/bugs/842676

Title:
  aptd crashed with SIGSEGV in pkgProblemResolver::MakeScores()

Status in “python-apt” package in Ubuntu:
  New

Bug description:
  hi

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: aptdaemon 0.43+bzr691
  ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
  Uname: Linux 3.0.0-10-generic i686
  Architecture: i386
  Date: Tue Sep  6 11:57:07 2011
  DesktopFile: /usr/share/aptdaemon/aptdaemon.desktop
  ExecutablePath: /usr/sbin/aptd
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110901)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/sbin/aptd
  ProcEnviron:
   
  SegvAnalysis:
   Segfault happened at: 0x103dc4d <_ZN18pkgProblemResolver10MakeScoresEv+1645>:	imul   $0x1c,0x28(%eax),%eax
   PC (0x0103dc4d) ok
   source "$0x1c" ok
   destination "0x28(%eax)" (0xc405a8b8) not located in a known VMA region (needed writable region)!
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: aptdaemon
  StacktraceTop:
   pkgProblemResolver::MakeScores() () from /usr/lib/libapt-pkg.so.4.11
   pkgProblemResolver::ResolveByKeepInternal() () from /usr/lib/libapt-pkg.so.4.11
   pkgProblemResolver::ResolveByKeep() () from /usr/lib/libapt-pkg.so.4.11
   pkgAllUpgrade(pkgDepCache&) () from /usr/lib/libapt-pkg.so.4.11
   ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so
  Title: aptd crashed with SIGSEGV in pkgProblemResolver::MakeScores()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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