Performing verification for Focal.
I installed php7.4 and php7.4-mysql from -updates, version
7.4.3-4ubuntu2.5.
I also installed mysql and set up the database table and inserted data
into it.
$ sudo apt-cache policy php7.4 | grep Installed
Installed: 7.4.3-4ubuntu2.5
$ cat testcase.php
<?php
$dbConn= new mysqli("127.0.0.1", "ubuntu", "ubuntu", "ubuntu_releases",
"3306");
$SQL="SELECT * from ubuntu_releases";
$stmt=$dbConn->prepare($SQL);
$stmt->attr_set(MYSQLI_STMT_ATTR_CURSOR_TYPE,
MYSQLI_CURSOR_TYPE_READ_ONLY);
$stmt->execute();
if ($stmt) {
$res = $stmt->get_result();
while($row = $res->fetch_assoc()) {
echo json_encode($row) . "\n";
}
}
$dbConn->close()
?>
$ php testcase.php
Segmentation fault (core dumped)
$ tail /var/log/kern.log
Sep 1 02:58:22 ubuntu kernel: [ 9394.000341] php[12973]: segfault at
1700000119 ip 00007f0f2bc575d0 sp 00007ffceb8d0bb0 error 4 in
mysqlnd.so[7f0f2bc3c000+20000]
Sep 1 02:58:22 ubuntu kernel: [ 9394.000363] Code: 24 08 48 8b 04 24 4c 8b 44
24 10 48 8b 3e 8b 56 08 48 89 38 89 50 08 c7 46 08 01 00 00 00 eb 82 66 2e 0f
1f 84 00 00 00 00 00 <49> 8b bc 24 18 01 00 00 48 8b 15 11 5a 01 00 be de 07 00
00 48 8b
We segfault trying to use the mysqli cursor.
I then enabled -proposed, and installed php7.4 version 7.4.3-4ubuntu2.6.
$ sudo apt-cache policy php7.4 | grep Installed
Installed: 7.4.3-4ubuntu2.6
$ php testcase.php
{"year":21,"month":4,"name":"hirsute"}
{"year":20,"month":10,"name":"groovy"}
{"year":20,"month":4,"name":"focal"}
We no longer segfault, and we can read rows from the mysqli cursor
correctly.
The fixed package in -proposed solves the issue. Happy to mark Focal as
verified.
** Tags removed: verification-needed-focal
** Tags added: verification-done-focal
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https://bugs.launchpad.net/bugs/1939853
Title:
mysqli: Using a cursor with get_result() and prepared statements
causes a segmentation fault
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