| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, maxime(dot)boyer(at)cra-arc(dot)gc(dot)ca, pgsql-bugs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: BUG #18165: Could not duplicate handle for "Global/PostgreSQL.xxxxxxxxxx": Bad file descriptor |
| Date: | 2023-10-21 04:10:50 |
| Message-ID: | CA+hUKGJCQKTeAVDXRvsLeEwh=H2-NGoy7DaVcwxOsR9638ZniA@mail.gmail.com |
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| Lists: | pgsql-bugs |
Ahh, I think I might see it. "Global/PostgreSQL.2437152779" is an odd
DSM handle (as in, the low order bit is set). That means that it's a
"main region" DSM segment, of the type that you get if you set
min_dynamic_shared_memory (commit 84b1c63a). That looks potentially
broken on Windows, because we have this extra NT handle sharing stuff
in dsm_impl_pin_segment(), which can't possibly work and should
probably be gated on !is_main_region_dsm_handle(seg->handle). On
every other OS that function does nothing, which would explain how we
didn't notice for so long.
Maxime, do you have min_dynamic_shared_memory set?
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