MIME-Version: 1.0
From: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>
Date: Fri, 12 Dec 2025 11:39:50 +0100
Message-ID: 
 <CAO6_XqoxJXddcT4wkd9Xd+cD6Sz-fyspRGuV4Bq-wbXG4pVNzA@mail.gmail.com>
Subject: Propagate XLogFindNextRecord error to callers
To: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Content-Type: multipart/mixed; boundary="0000000000003f34730645bee24e"
Archived-At: 
 <https://www.postgresql.org/message-id/CAO6_XqoxJXddcT4wkd9Xd%2BcD6Sz-fyspRGuV4Bq-wbXG4pVNzA%40mail.gmail.com>
Precedence: bulk

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Content-Type: text/plain; charset="UTF-8"

Hi,

Currently, XLogFindNextRecord errormsg is ignored and callers will only
output a generic 'could not find a valid record' message without details.
Additionally, invalid page header won't go through XLogReadRecord, leaving
the error in state->errormsg_buf.

This patch propagates XLogFindNextRecord's error message to the callers and
displays it. In case of an invalid page header, the errormsg is filled with
errormsg_buf content.

With this patch, pg_waldump will now have the following output when reading
a file with an invalid header:
pg_waldump: error: could not find a valid record after D80/5C000000:
invalid magic number D116 in WAL segment 0000001400000D8000000017, LSN
D80/5C000000, offset 0

Regards,
Anthonin Bonnefoy

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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">Hi,<div><br></div><div>Currently, XLogFindNextRecord error=
msg is ignored and callers will only output a generic &#39;could not find a=
 valid record&#39; message without details.</div><div>Additionally, invalid=
 page header won&#39;t go through XLogReadRecord, leaving the error in stat=
e-&gt;errormsg_buf.<br><br>This patch propagates XLogFindNextRecord&#39;s e=
rror message to the callers and displays it. In case of an invalid page hea=
der, the errormsg is filled with errormsg_buf content.</div><div><br></div>=
<div>With this patch, pg_waldump will now have the following output when re=
ading a file with an invalid header:</div><div>pg_waldump: error: could not=
 find a valid record after D80/5C000000: invalid magic number D116 in WAL s=
egment 0000001400000D8000000017, LSN D80/5C000000, offset 0=C2=A0</div><div=
><br></div><div>Regards,</div><div>Anthonin Bonnefoy</div></div>

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--0000000000003f34730645bee24e
Content-Type: application/octet-stream;
	name="v1-0001-Propage-errormsg-to-XLogFindNextRecord-caller.patch"
Content-Disposition: attachment;
	filename="v1-0001-Propage-errormsg-to-XLogFindNextRecord-caller.patch"
Content-Transfer-Encoding: base64
Content-ID: <f_mj2qfhjd0>
X-Attachment-Id: f_mj2qfhjd0

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