| From: | Michael Paquier <michael(at)paquier(dot)xyz> |
|---|---|
| To: | Robins Tharakan <tharakan(at)gmail(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: ALTER TABLE ALTER COLUMN SET TYPE crash |
| Date: | 2020-08-25 06:05:11 |
| Message-ID: | 20200825060511.GF2017@paquier.xyz |
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| Thread: | |
| Lists: | pgsql-bugs |
On Tue, Aug 25, 2020 at 02:14:06PM +1000, Robins Tharakan wrote:
> Unlike a recently reported similar issue, executing the following ALTER
> TABLE on the regression database crashes Postgres (master).
>
> Admittedly it doesn't do anything constructive (and am new to the tool),
> but do let me know if such reports are interesting and / or if you need
> more details for reproduction.
Such reports are constructive! I can reproduce the crash here down to
9.5. From what I can see, the problem comes from ATRewriteTable() ->
ExecEvalExpr() when we evaluate expressions with inputs coming from
the old tuple. It looks like a memory corruption issue or a context
issue at quick glance, and I cannot get a clean backtrace.
--
Michael
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