Port server memcached ... exited with status 134

From log:

Port server memcached on node 'ns_1@10.18.2.7' exited with status 134. Restarting. Messages: Extension support isn't implemented in this version of bucket_engine
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.5.4 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.5.4 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.6.3 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.6.3 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.7.2 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.7.2 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Consumer) eq_tapq:anon_1 - disconnected
Schedule cleanup of "eq_tapq:anon_1"
TAP (Consumer) eq_tapq:anon_2 - disconnected
Schedule cleanup of "eq_tapq:anon_2"
TAP (Consumer) eq_tapq:anon_3 - disconnected
Schedule cleanup of "eq_tapq:anon_3"
TAP (Consumer) eq_tapq:anon_4 - disconnected
Schedule cleanup of "eq_tapq:anon_4"
TAP (Consumer) eq_tapq:anon_5 - disconnected
Schedule cleanup of "eq_tapq:anon_5"
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - disconnected, keep alive for 300 seconds
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - disconnected, keep alive for 300 seconds
TAP (Producer) eq_tapq:replication_ns_1@10.18.5.4 - disconnected, keep alive for 300 seconds
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Connection is closed by force.
TAP (Producer) eq_tapq:replication_ns_1@10.18.6.3 - disconnected, keep alive for 300 seconds
Schedule cleanup of "eq_tapq:anon_11"
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Clear the tap queues by force
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Connection is closed by force.
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
Schedule cleanup of "eq_tapq:anon_12"
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Clear the tap queues by force
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.7.2 - disconnected, keep alive for 300 seconds
TAP (Producer) eq_tapq:replication_ns_1@10.18.5.4 - Connection is closed by force.
Schedule cleanup of "eq_tapq:anon_13"
TAP (Producer) eq_tapq:replication_ns_1@10.18.5.4 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.5.4 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.5.4 - Clear the tap queues by force
TAP (Producer) eq_tapq:replication_ns_1@10.18.6.3 - Connection is closed by force.
Schedule cleanup of "eq_tapq:anon_14"
TAP (Producer) eq_tapq:replication_ns_1@10.18.6.3 - Clear the tap queues by force
TAP (Producer) eq_tapq:replication_ns_1@10.18.7.2 - Connection is closed by force.
Schedule cleanup of "eq_tapq:anon_15"
TAP (Producer) eq_tapq:replication_ns_1@10.18.7.2 - Clear the tap queues by force
TAP (Producer) eq_tapq:replication_ns_1@10.18.6.3 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.6.3 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.7.2 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.7.2 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Consumer) eq_tapq:anon_6 - disconnected
Schedule cleanup of "eq_tapq:anon_6"
TAP (Consumer) eq_tapq:anon_7 - disconnected
Schedule cleanup of "eq_tapq:anon_7"
TAP (Consumer) eq_tapq:anon_8 - disconnected
Schedule cleanup of "eq_tapq:anon_8"
TAP (Consumer) eq_tapq:anon_10 - disconnected
Schedule cleanup of "eq_tapq:anon_10"
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - disconnected, keep alive for 300 seconds
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - disconnected, keep alive for 300 seconds
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Connection is closed by force.
Schedule cleanup of "eq_tapq:anon_20"
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.4.5 - Clear the tap queues by force
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Connection is closed by force.
Schedule cleanup of "eq_tapq:anon_21"
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Clear the tap queues by force
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Sending TAP_OPAQUE with command "opaque_enable_auto_nack" and vbucket 0
TAP (Producer) eq_tapq:replication_ns_1@10.18.3.6 - Sending TAP_OPAQUE with command "enable_checkpoint_sync" and vbucket 0
tcmalloc: large alloc 1073741824 bytes == 0x57345a000 @
memcached: ep.cc:1868: int EventuallyPersistentStore::flushOneDelOrSet(const queued_item&, std::queue, std::deque, std::allocator > > >*): Assertion `dirtyAge < (86400 * 30)' failed.