From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
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To: | Christoph Berg <myon(at)debian(dot)org>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Direct I/O |
Date: | 2023-04-12 03:04:16 |
Message-ID: | CA+hUKGLqTudMtadrF2honEjszNsHQodj__UcfCDiQ7wJ2NbAfw@mail.gmail.com |
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Lists: | pgsql-hackers |
On Wed, Apr 12, 2023 at 2:56 PM Christoph Berg <myon(at)debian(dot)org> wrote:
> I'm hitting a panic in t_004_io_direct. The build is running on
> overlayfs on tmpfs/ext4 (upper/lower) which is probably a weird
> combination but has worked well for building everything over the last
> decade. On Debian unstable:
>
> PANIC: could not open file "pg_wal/000000010000000000000001": Invalid argument
Hi Christoph,
That's an interesting one. I was half expecting to see that on some
unusual systems, which is why I made the test check which OS it is and
exclude those that are known to fail with EINVAL or ENOTSUPP on their
common/typical file systems. But if it's going to be Linux, that's
not going to work. I have a new idea: perhaps it is possible to try
to open a file with O_DIRECT from perl, and if it fails like that,
skip the test. Looking into that now.
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