Bug #74179 [Dup]: Large mysql requests broken after update to 7.0.x
Edit report at https://bugs.php.net/bug.php?id=74179&edit=1
ID: 74179
User updated by: nish dot aravamudan at canonical dot com
Reported by: nish dot aravamudan at canonical dot com
Summary: Large mysql requests broken after update to 7.0.x
Status: Duplicate
Type: Bug
Package: MySQL related
Operating System: Ubuntu 16.04
PHP Version: 7.0.16
Block user comment: N
Private report: N
New Comment:
Thank you for the quick responses!
Previous Comments:
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[2017-02-27 21:47:41] nikic@php.net
This is a duplicate of bug #74021, which was a regression introduced in 7.0.15 (due to an incorrect
fix for bug #73800). The issue is fixed by https://github.com/php/php-src/commit/01c1afa79f614fe8376e73f4e73f392160923745,
which will be part of PHP 7.0.17.
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[2017-02-27 21:39:39] spam2 at rhsoft dot net
smells like https://bugs.php.net/bug.php?id=74021 which was
still not fixed with 71.2. / 7.0.16
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[2017-02-27 21:27:28] nish dot aravamudan at canonical dot com
Description:
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Original bug report: https://bugs.launchpad.net/ubuntu/+source/php7.0/+bug/1668017
Roughly, we produced a security/update update of the PHP7.0 package in Ubuntu which bumped up to
7.0.15. A user reported that this regressed their installation, specifically:
a web application serving rather big binary blobs from a MariaDB table. After the unattended update
(7.0.8-0ubuntu0.16.04.3 to 7.0.15-0ubuntu0.16.04.2), the application would routinely break while
trying to fetch a >16Mbyte row from the database server.
Requests resulting in a row under 16Mbyte are processed normally, anything above it would return
columns in the wrong order, and right around 0xFFFFF2 a null-character (0x00) is inserted into the
stream (when the resulting file is compared to one served with the version used previously)
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The prior (working) version was 7.0.8 based.
Test script:
---------------
The reporter provided a relatively straightforward test case:
- Ubuntu 16.04
- MariaDB Server (not tested on mysql, but I expect similar results)
- php 7.0 (7.0.15)
- phpMyAdmin
Configuration:
MariaDB: max_allowed_packet = 128M
php: post_max_size and upload_max_filesize raised to 128M
Import the some SQL data, for instance: https://we.tl/vb37KISpUU.
This will build you a MyISAM table with 4 columns, 3x varchar(1) and 1 longblob. The table will have
one big blob in it, with 32Mbyte worth of 0x20 (space)
Downloading the binary through phpMyAdmin on 7.0.15 will produce a file with a null-character
inserted at (for my setup) 0xFFFFF6, the rest of the file is as expected.
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