From: Alexander Lakhin <exclusion@gmail.com>
To: Thomas Munro <thomas.munro@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>
Subject: Re: BUG #17064: Parallel VACUUM operations cause the error "global/pg_filenode.map contains incorrect checksum"
Date: Wed, 23 Jun 2021 06:00:01 +0300
Message-ID: <fc9d5334-2ea5-071c-d098-406652b75f1e@gmail.com> (raw)
In-Reply-To: <CA+hUKG+19bZKidSiWmMsDmgUVe=_rr0m57LfR+nAbWprVDd_cw@mail.gmail.com>
References: <17064-bb0d7904ef72add3@postgresql.org>
<ac119d1e-05d1-f050-b92a-0a524d68b848@iki.fi>
<CA+hUKGJ98=MOjDCnMAC5gSpkzrrey=O+aEQJ1OY03C=cVtiwkA@mail.gmail.com>
<1715251.1624371066@sss.pgh.pa.us>
<CA+hUKGKKgJbFycOfr6JTBLp_A-zKY1Ow8zndB6qjwSJpw7Yzgg@mail.gmail.com>
<CA+hUKG+19bZKidSiWmMsDmgUVe=_rr0m57LfR+nAbWprVDd_cw@mail.gmail.com>
23.06.2021 05:29, Thomas Munro wrote:
> On Wed, Jun 23, 2021 at 12:50 PM Thomas Munro <thomas.munro@gmail.com> wrote:
>> repro
> Here's a quick-and-dirty repro -- just touch test-file and then run
> it. It fails about 0.1% of its read loops on ext4, for me, but
> outputs nothing on other file systems and OSes I tried (XFS, FBSD UFS,
> APFS). Seems a bit like there is a tendency for 64 byte (cache line?)
> granularity in the mashed data it prints out.
Yes, this repro fails for me too (on ext4).
11111111111111111111111111111111222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222
11111111111111111111111111111111111111111111111111111111111111111111111111111111222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222221111111111111111111111111111111122222222222222222222222222222222111111111111111111111111111111112222222222222222222222222222222211111111111111111111111111111111222222222222222222222222222222222222222222222222
11111111111111111111111111111111111111111111111111111111111111112222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222
But granularity is 16-byte. (I've seen the fail count 19763 out of
1000000 loops.)
Best regards,
Alexander
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To: pgsql-bugs@postgresql.org
Cc: exclusion@gmail.com, thomas.munro@gmail.com, tgl@sss.pgh.pa.us, hlinnaka@iki.fi, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #17064: Parallel VACUUM operations cause the error "global/pg_filenode.map contains incorrect checksum"
In-Reply-To: <fc9d5334-2ea5-071c-d098-406652b75f1e@gmail.com>
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