laravelで作成したプロジェクトでサーバを起動しようとしたところこのようなエラーがでた

Version
・PHP 7.4.9
・Composer 2.0.0-alpha3
・Laravel Installer 3.2.0

$php artisan serve

Laravel development server started: http://127.0.0.1:8000
Sun Aug 16 19:18:09 2020 (10355): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8001
Sun Aug 16 19:18:09 2020 (10356): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8002
Sun Aug 16 19:18:09 2020 (10357): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8003
Sun Aug 16 19:18:09 2020 (10358): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8004
Sun Aug 16 19:18:09 2020 (10359): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8005
Sun Aug 16 19:18:09 2020 (10360): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8006
Sun Aug 16 19:18:09 2020 (10361): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8007
Sun Aug 16 19:18:09 2020 (10362): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8008
Sun Aug 16 19:18:09 2020 (10363): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8009
Sun Aug 16 19:18:09 2020 (10364): Fatal Error Unable to create lock file: Bad file descriptor (9)
Laravel development server started: http://127.0.0.1:8010
Sun Aug 16 19:18:09 2020 (10365): Fatal Error Unable to create lock file: Bad file descriptor (9)

ロックファイルが作成できないらしい。

↓この人と同じ現象だったので、ルートのtmpディレクトリに書き込みの権限を与えたところ解決した。
https://stackoverflow.com/questions/39098717/fatal-error-unable-to-create-lock-file-bad-file-descriptor-9-while-running