i'm using declarative pipeline to build android and ios app, jenkins master is running on docker.

sometime jenkins job will block on master node , can't dispatch to slave node, but my slave node is everything ok. the image is blow.

my slave is physical machine, and declarative pipeline will start a docker to run job.

my server and agent is centos, linux kernel version is 3.10.0.

my jdk version is 1.8.0.

somtimes block jobs, the block job is randomly, i have no idea what to do.