Jehan-Guillaume de Rorthais <jgdr(at)dalibo(dot)com> writes:
> When investigating for the bug reported in thread "logical replication -
> negative bitmapset member not allowed", I found a way to seg fault postgresql
> only when cassert is enabled.
> ...
> I hadn't time to digg further yet. However, I don't understand why this crash
> is triggered when cassert is enabled.
Most likely, it's not so much assertions that provoke the crash as
CLOBBER_FREED_MEMORY, ie the actual problem here is use of already-freed
memory.
regards, tom lane