最近搭建了一个CephFS的环境用于debug问题，一切配好之后，通过ceph-fuse（ceph-fuse -k /etc/ceph/ceph.client.admin.keyring -m 10.0.101.70:6789 /mnt/cephfs/）来挂载CephFS，但发现命令会hang住不结束，通过log发现，命令hang在了：
rt_sigaction(SIGSYS, {0x634d10, [], SA_RESTORER|SA_NODEFER|SA_RESETHAND, 0x7f28b65f7790}, {SIG_DFL, [], 0}, 8) = 0
mkdir("/var/run/ceph", 0755) = -1 EEXIST (File exists)
close(3) = 0
open("1.log", O_WRONLY|O_CREAT|O_APPEND, 0644) = 3
prctl(PR_GET_NAME, 0x7ffd1de55fe0, 0, 0x92, 0x20) = 0
futex(0x3729e34, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x3729e30, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
socketpair(PF_FILE, SOCK_STREAM, 0, [4, 5]) = 0
futex(0x7f28b4e6e9d0, FUTEX_WAIT, 30214, NULL) = -1 EAGAIN (Resource temporarily unavailable)
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f28b73d6