Bug in pool php-fpm?

Question

linux

Hello. For some reason, the php7.0-fpm daemon stops starting after adding a pool to /etc/php/7.0/fpm/pool.d

[vhost_26]
user = vhost_26
group = vhost_26
listen = /var/run/php7.0-uvhost_26.sock
listen.owner = www-data
listen.group = www-data
php_admin_value[disable_functions] = exec,passthru,shell_exec,system
php_admin_flag[allow_url_fopen] = off
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
chdir = /