I was Valgrinding Gabble the other day to find the cause of some heap corruption bugs people have reported. I idn't find a particularly smoking gun, but I did find various small issues and race conditions, which are fixed in my ‘the-daily-valgrind’ branch.

I also some found some slightly larger issues (mostly involving accidentally modifying hash tables while iterating them with g_hash_table_foreach, which explicitly forbids you doing so), but will fix them in a separate branch.