[Bug 1066445] Re: apt-get crashed with SIGSEGV in pkgCacheGenerator::ListParser::NewProvides()

[Colin Watson]

** Changed in: apt (Ubuntu Quantal)
     Assignee: (unassigned) => Colin Watson (cjwatson)

** Changed in: apt (Ubuntu Quantal)
    Milestone: None => ubuntu-12.10

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https://bugs.launchpad.net/bugs/1066445

Title:
  apt-get crashed with SIGSEGV in
  pkgCacheGenerator::ListParser::NewProvides()

Status in “apt” package in Ubuntu:
  Confirmed
Status in “apt” source package in Quantal:
  Confirmed

Bug description:
  Starting today, most apt operations started crashing to the extent
  that I can't even run ubuntu-bug apt. rm -f /var/lib/apt/* does not
  help either, or switching from a mirror to main archive. The crash
  happens in apt-get update when reading package lists after they have
  been downloaded.

  TEST CASE:
  1. Press shift on boot to display the boot menu
  2. Press F6 and select the option 'Free software only'
  3. Continue with a default installation
  4. At the end of the installation reboot
  5. Login and run 'apt-get update'

  ALTERNATIVE TEST CASE:
  1. Copy the file sources.list attached to this report (https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1066445/+attachment/3398341/+files/sources.list) to /etc/apt/ on an existing system (backup the exiting file first!)
  2. Run 'apt-get update'

  ACTUAL RESULT
  apt will crash with the trace below

  StacktraceTop:
   pkgCacheGenerator::ListParser::NewProvides (this=0x7ffffeba7910, Ver=..., PkgName=..., PkgArch=..., Version=...) at pkgcachegen.cc:920
   debListParser::NewProvidesAllArch (this=this at entry=0x7ffffeba7910, Ver=..., Package=..., Version=...) at deb/deblistparser.cc:722
   debListParser::ParseProvides (this=this at entry=0x7ffffeba7910, Ver=...) at deb/deblistparser.cc:711
   debListParser::NewVersion (this=0x7ffffeba7910, Ver=...) at deb/deblistparser.cc:171
   pkgCacheGenerator::MergeListVersion (this=this at entry=0x7ffffeba84a0, List=..., Pkg=..., Version=..., OutVer=@0x7ffffeba75e8: 0x0) at pkgcachegen.cc:388

  ===

  gdb apt-get upgrade gives (and update crash at package list reading
  looks identical):

  #0  0x00007ffff7b4dd20 in pkgCacheGenerator::ListParser::NewProvides(pkgCache::VerIterator&, std::string const&, std::string const&, std::string const&) ()
     from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #1  0x00007ffff7b864d1 in debListParser::NewProvidesAllArch(pkgCache::VerIterator&, std::string const&, std::string const&) ()
     from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #2  0x00007ffff7b883e3 in debListParser::ParseProvides(pkgCache::VerIterator&)
      () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #3  0x00007ffff7b8902c in debListParser::NewVersion(pkgCache::VerIterator&) ()
     from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #4  0x00007ffff7b4c458 in pkgCacheGenerator::MergeListVersion(pkgCacheGenerator::ListParser&, pkgCache::PkgIterator&, std::string const&, pkgCache::VerIterator*&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #5  0x00007ffff7b4d6a3 in pkgCacheGenerator::MergeList(pkgCacheGenerator::ListParser&, pkgCache::VerIterator*) ()
     from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #6  0x00007ffff7ba173a in debPackagesIndex::Merge(pkgCacheGenerator&, OpProgress*) const () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #7  0x00007ffff7b46632 in ?? ()
     from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #8  0x00007ffff7b49409 in pkgCacheGenerator::MakeStatusCache(pkgSourceList&, OpProgress*, MMap**, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #9  0x00007ffff7b400c1 in pkgCacheFile::BuildCaches(OpProgress*, bool) ()
     from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #10 0x00007ffff7b4045c in pkgCacheFile::Open(OpProgress*, bool) ()
     from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #11 0x000000000042113c in ?? ()
  #12 0x00000000004160a3 in ?? ()
  #13 0x00007ffff7afa562 in CommandLine::DispatchArg(CommandLine::Dispatch*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
  #14 0x000000000040a2ac in ?? ()
  #15 0x00007ffff720276d in __libc_start_main (main=0x40a070, argc=2,
      ubp_av=0x7fffffffe328, init=<optimized out>, fini=<optimized out>,
      rtld_fini=<optimized out>, stack_end=0x7fffffffe318) at libc-start.c:226
  #16 0x000000000040a591 in ?? ()
  #17 0x00007fffffffe318 in ?? ()
  #18 0x000000000000001c in ?? ()
  #19 0x0000000000000002 in ?? ()
  #20 0x00007fffffffe60c in ?? ()
  #21 0x00007fffffffe61d in ?? ()
  #22 0x0000000000000000 in ?? ()

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