| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: seawasp failing, maybe in glibc allocator |
| Date: | 2021-05-22 00:25:10 |
| Message-ID: | 20210522002510.oorongxox362vgvd@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2021-05-21 15:57:01 -0700, Andres Freund wrote:
> I found the LLVM commit to blame (c8fc5e3ba942057d6c4cdcd1faeae69a28e7b671).
> Contacting the author and reading the change to see if I can spit the
> issue myself.
Hrmpf. It's a silent API breakage. The author intended to email us about
it, but apparently forgot. One now needs to increment a string-pool
refcount. The reason that didn't trigger a reliable crash is that
there's a path where the refcount of string-pool entries aren't asserted
to be above before decrementing the refcount... And that there
practically never are references to the pool entries after use.
Continuing to discusss whether there's a better way to deal with this.
Greetings,
Andres Freund
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