Bug #74179 [Com]: 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 Comment by: spam2 at rhsoft dot net Reported by: nish dot aravamudan at canonical dot com Summary: Large mysql requests broken after update to 7.0.x Status: Open Type: Bug Package: MySQL related Operating System: Ubuntu 16.04 PHP Version: 7.0.16 Block user comment: N Private report: N New Comment: smells like https://bugs.php.net/bug.php?id=74021 which was still not fixed with 71.2. / 7.0.16 Previous Comments: ------------------------------------------------------------------------ [2017-02-27 21:27:28] nish dot aravamudan at canonical dot com Description: ------------ 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) --- 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. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74179&edit=1