python - Python2.7: ssh.exec_command works on Ubuntu not on FreeBSD -

i'm creating ssh channel remote host using paramiko. however, when try execute command using ssh_object.exec_command, command doesn't seem executed on freebsd boxes, works on ubuntu boxes. there permission issue or prerequisite need check in remote machines?

this function creates ssh handler:

def ssh_connect(ip,user,pwd):     '''     function make ssh connection ip using credentials passed , return handler     args:         ip: ip address of box ssh has done         user: user name of box ssh has done         pass: password of box ssh has done     returns:         ssh handler     '''     ssh = paramiko.sshclient()     ssh.set_missing_host_key_policy(paramiko.autoaddpolicy())     ssh.connect(ip, username=user, password=pwd)       return ssh 

and i'm using handler:

ssh_obj = ssh_connect(ip, username, password) folder = "/var/xyz/images/" + build_number command = "mkdir " + folder ssh_stdin, ssh_stdout, ssh_stderr = ssh_obj.exec_command(command) 

when go remote machine, folder has not got created. similarly, tried reading output of ls command well. no response arrives when ssh_stdout.read().

there's not response when run ssh_stderr.read() either.

the strace of process id stuck here:

root@ubuntu:~# strace -p 2368 process 2368 attached futex(0xef1e20, futex_wait_private, 0, null 

where going wrong?