Description:
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We configured session store as memcached, it was working fine in PHP 5.6.X,
after upgraded to PHP 7.0.30, when we start session its throwing error as "session_start(): Unable to clear session lock record", below are the configuration we are using,

PHP Version 7.0.30
memcached   3.0.3
libmemcached version  1.0.18
ZendFramework 2.4.13

below are the memcached settings configured in ini,

memcached.sess_lock_expire => 0 => 0
memcached.sess_lock_max_wait => not set => not set
memcached.sess_lock_retries => 5 => 5
memcached.sess_lock_wait => not set => not set
memcached.sess_lock_wait_max => 2000 => 2000
memcached.sess_lock_wait_min => 1000 => 1000
memcached.sess_locking => 1 => 1
memcached.sess_number_of_replicas => 0 => 0
memcached.sess_persistent => 0 => 0
memcached.sess_prefix => memc.sess. => memc.sess.

also we have tried with below configuration changes,

memcached.sess_lock_retries => 10 => 10 // 50 also tried
memcached.sess_lock_wait_max => 150 => 150
memcached.sess_lock_wait_min => 150 => 150

session.lazy_write => Off => Off

but it didn't work, keep on getting "session_start(): Unable to clear session lock record"