[Bug 1747180] Re: SIGSEGV in pkgPolicy::GetPriority()

[Julian Andres Klode]

Thanks for your bug report. I made it public as it does not contain any
sensitive information. I'm not entirely sure why this is happening, but
I might dig into it a bit later.

** Information type changed from Private to Public

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Title:
  SIGSEGV in pkgPolicy::GetPriority()

Status in apt package in Ubuntu:
  New

Bug description:
  Continuous Crashes, especialle when you see video, generate Core Dumps
  You can solve restarting

  Ubuntu 16.04
  Kernel 4.4.0-122-generic
  apt 1.2.24

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: apt 1.2.24
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CrashCounter: 1
  Date: Sat Feb  3 11:43:46 2018
  ExecutablePath: /usr/bin/apt-get
  InstallationDate: Installed on 2016-10-22 (468 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  ProcCmdline: apt-get install vidcutter
  SegvAnalysis:
   Segfault happened at: 0x7f4963a9a5ef <_ZN9pkgPolicy11GetPriorityERKN8pkgCache11VerIteratorEb+143>:	testb  $0x1,0x28(%rdx)
   PC (0x7f4963a9a5ef) ok
   source "$0x1" ok
   destination "0x28(%rdx)" (0x7f4962f85858) in non-writable VMA region: 0x7f4962f82000-0x7f4963182000 ---p /lib/x86_64-linux-gnu/libc-2.23.so
  SegvReason: writing VMA /lib/x86_64-linux-gnu/libc-2.23.so
  Signal: 11
  SourcePackage: apt
  StacktraceTop:
   pkgPolicy::GetPriority(pkgCache::VerIterator const&, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
   ?? () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
   pkgPolicy::GetCandidateVer(pkgCache::PkgIterator const&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
   pkgDepCache::Init(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
   pkgCacheFile::BuildDepCache(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0
  Title: apt-get crashed with SIGSEGV in pkgPolicy::GetPriority()
  UpgradeStatus: No upgrade log present (probably fresh install)
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