Malformed packet error

[81698]

Issue description

Tell us what should happen and what happens instead
Expected this to open a connection and return a 1 from the database. Instead got a malformed packet error.
Works in v1.3.0

Example code

If possible, please enter some example code here to reproduce the issue.
func TestAQuery(t *testing.T) {
    db, err := sql.Open("mysql", "username:password@/database?allowOldPasswords=1")
    if err != nil {
        t.Fatal(err)
    }
    defer db.Close()
    var id int
    if err := db.QueryRow("SELECT 1").Scan(&id); err != nil {
        t.Fatal(err)
    }
}

Error log

If you have an error log, please paste it here.
malformed packet

Configuration

Driver version (or git SHA):
v1.4.0

Go version: run go version in your console
go version devel +15c106d Tue Aug 7 20:33:33 2018 +0000 linux/amd64

Server version: E.g. MySQL 5.6, MariaDB 10.0.20
5.5.59-MariaDB

Server OS: E.g. Debian 8.1 (Jessie), Windows 10
14.04.1-Ubuntu

[methane]

Could you dump packets by tcpdump?
tcpdump can be used to dump packets to pcap file which can be browsed by wireshark.

e.g. sudo tcpdump port 3306 -w dump.pcap

[mqy]

Similar problem on 5.5.35-MariaDB with latest code (99ff426) and v1.4.0. Failed with parameters:

• query_cache_type=0
• allowOldPasswords=true
• allowCleartextPasswords=true

But works with the following commit without above parameters:

commit 02eb68a
Author: Alexey Palazhchenko alexey.palazhchenko@gmail.com
Date: Sat Mar 3 19:06:37 2018 +0300

[methane]

Do you use old password?

[methane]

Even MySQL client shows "malfold packet" error.

$ mysql -uroot -h127.0.0.1 -P3306
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.61-MariaDB-1~trusty mariadb.org binary distribution

mysql> create user test1;
Query OK, 0 rows affected (0.00 sec)

mysql> set password for test1 = OLD_PASSWORD('secret');
Query OK, 0 rows affected (0.00 sec)

mysql> ^DBye

$ mysql -utest1  -h127.0.0.1 -P3306 -psecret
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2027 (HY000): Malformed packet

[dwlnetnl]

I encounter this issue as well.