Comment 102 for bug 1104435

The only way I can see g_slice_alloc possibly segfaulting is if its only parameter block_size was either 0 or the client requested more memory than was available. Otherwise the problem could well be in glib since if the call failed, one might expect it to have returned NULL, but then the crash would have happened in the caller when it dereferenced it and not within the g_slice_alloc function itself. I also don't think it is a threading issue because glib is allegedly thread safe.