mysql startWatcher panic error

[freehere107]

Issue description

goroutine startWatcher cause panic error

Example code

Since it happens in goroutine, there is no code to reproduce

0xee0f31	github.com/go-sql-driver/mysql.(*mysqlConn).startWatcher.func1+0x131	/home/runner/go/pkg/mod/github.com/go-sql-driver/mysql@v1.6.0/connection.go:620

Error log

panic: sync/atomic: store of nil value into Value

goroutine 1961295 [running]:
sync/atomic.(*Value).Store(0xc002e34ef0?, {0x0, 0x0})
	/opt/hostedtoolcache/go/1.19.13/x64/src/sync/atomic/value.go:49 +0xf8
github.com/go-sql-driver/mysql.(*atomicError).Set(...)
	/home/runner/go/pkg/mod/github.com/go-sql-driver/mysql@v1.6.0/utils.go:831
github.com/go-sql-driver/mysql.(*mysqlConn).cancel(0xc0022a2b40?, {0x0?, 0x0?})
	/home/runner/go/pkg/mod/github.com/go-sql-driver/mysql@v1.6.0/connection.go:435 +0x3d
github.com/go-sql-driver/mysql.(*mysqlConn).startWatcher.func1()
	/home/runner/go/pkg/mod/github.com/go-sql-driver/mysql@v1.6.0/connection.go:622 +0x16a
created by github.com/go-sql-driver/mysql.(*mysqlConn).startWatcher
	/home/runner/go/pkg/mod/github.com/go-sql-driver/mysql@v1.6.0/connection.go:611 +0x10a

Configuration

Driver version (or git SHA):
v1.6.0
Go version: run go version in your console
1.19.13
Server version: E.g. MySQL 5.6, MariaDB 10.0.20
MySQL 8.0.30
Server OS: E.g. Debian 8.1 (Jessie), Windows 10
alpine:3

[methane]

Since it happens in goroutine, there is no code to reproduce

"happens in goroutine" is not a reason to no code to reproduce.

Thousands of developers are using this library without problems on millions of servers without encountering the phenomenon you report.
You must suspect that there is something wrong with your code or environment. That is why reproduced code is essential.

[freehere107]

@methane
Thanks.You are right. I will close the issue until the problem can be reproduced.

[li5ch]

@methane Thanks.You are right. I will close the issue until the problem can be reproduced.

hello I also meet same question with you, can u tell me the reason?