Bug#674951: [libapt-pkg4.12] aptitude crashes while updating packages list

[Grigory Ivanov <grundik-com@grundik.spb.ru>]

Another crash in version 0.9.6 with similar conditions:

Core was generated by `aptitude update'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f2190cbe322 in
debListParser::NewVersion(pkgCache::VerIterator&) () from
/usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
(gdb) backtrace
#0  0x00007f2190cbe322 in
debListParser::NewVersion(pkgCache::VerIterator&) () from
/usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#1  0x00007f2190c82668 in
pkgCacheGenerator::MergeListVersion(pkgCacheGenerator::ListParser&,
pkgCache::PkgIterator&, std::string const&, pkgCache::VerIterator*&) ()
   from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#2  0x00007f2190c838b3 in
pkgCacheGenerator::MergeList(pkgCacheGenerator::ListParser&,
pkgCache::VerIterator*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#3  0x00007f2190cd6cba in debPackagesIndex::Merge(pkgCacheGenerator&,
OpProgress*) const () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#4  0x00007f2190c7c892 in ?? () from
/usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#5  0x00007f2190c7f669 in
pkgCacheGenerator::MakeStatusCache(pkgSourceList&, OpProgress*, MMap**,
bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#6  0x00007f2190c7630d in pkgCacheFile::BuildCaches(OpProgress*, bool)
() from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#7  0x00007f219135c081 in ?? ()
#8  0x00007f21912e5aeb in ?? ()
#9  0x00007f21912e25d0 in ?? ()
#10 0x00007f21911c927b in main ()