| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Jehan-Guillaume de Rorthais <jgdr(at)dalibo(dot)com> |
| Cc: | pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: segmentation fault when cassert enabled |
| Date: | 2019-10-25 16:28:38 |
| Message-ID: | 18714.1572020918@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
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
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