Bug#669427: apt segfaults on s390x

[Faidon Liambotis <paravoid@debian.org>]

Package: apt
Version: 0.9.1
Severity: serious

apt 0.9.1 currently segfaults on the zelenka (our s390/s390x porterbox)
sid_s390x chroot. Downgrading apt to 0.8.15.10 makes it work again.

Backtrace follows, even though it probably isn't that helpful, since apt
doesn't have a debugging symbols package from what I could see.

For your convienience, I went on and installed apt's build-deps on
sid_s390x so that you rebuild and debug. Let me know if you need
anything else.

Thanks,
Faidon

#0  0x000002000029f386 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) () from /usr/lib/s390x-linux-gnu/libstdc++.so.6
#1  0x00000200000fa17a in IsDuplicateDescription(pkgCache::DescIterator, HashSumValue<128> const&, std::string const&) () from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#2  0x00000200000ff8b4 in pkgCacheGenerator::MergeListVersion(pkgCacheGenerator::ListParser&, pkgCache::PkgIterator&, std::string const&, pkgCache::VerIterator*&) () from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#3  0x0000020000100034 in pkgCacheGenerator::MergeList(pkgCacheGenerator::ListParser&, pkgCache::VerIterator*) () from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#4  0x00000200001664ec in debPackagesIndex::Merge(pkgCacheGenerator&, OpProgress*) const ()
   from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#5  0x00000200000f7390 in ?? () from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#6  0x00000200000fae6a in pkgCacheGenerator::MakeStatusCache(pkgSourceList&, OpProgress*, MMap**, bool) ()
   from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#7  0x00000200000ee74e in pkgCacheFile::BuildCaches(OpProgress*, bool) ()
   from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#8  0x00000200000eec02 in pkgCacheFile::Open(OpProgress*, bool) ()
   from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#9  0x000000008001f03e in ?? ()
#10 0x0000020000096b22 in CommandLine::DispatchArg(CommandLine::Dispatch*, bool) ()
   from /usr/lib/s390x-linux-gnu/libapt-pkg.so.4.12
#11 0x000000008000cc4e in ?? ()
#12 0x00000200003bea40 in __libc_start_main (main=<optimized out>, argc=<optimized out>, 
    ubp_av=<optimized out>, init=0x80029440, fini=0x8002943c, rtld_fini=0x20000010778, 
    stack_end=0x3ffffda2630) at libc-start.c:228
#13 0x000000008000cf82 in ?? ()