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Date: Sat, 23 Feb 2013 10:57:52 +0800
From: Jack <naruto0.1@live.cn>
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To: python-list@python.org
Subject: My script use paramiko module, it will be blocked at compute_hmac
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Hello
one problem, thanks for help

My script like this:
/hostname = xxx//
//username = xxx//
//password = xxx//
//t = paramiko.Transport((hostname, 22))//
//t.connect(username=username, password=password)//# here will be blocked
//sftp = paramiko.SFTPClient.from_transport(t)/

I used gdb attach the python process, found that:
/(gdb) py-bt
#2 <built-in function sleep>
#4 file '/usr/lib64/python2.6/threading.py', in 'wait'
#8 file '/usr/lib64/python2.6/threading.py', in 'wait'
#12 file
'/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/auth_handler.py',
in 'wait_for_response'
#15 file
'/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/transport.py',
in 'auth_password'
#19 file
'/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/transport.py',
in 'connect'
#23 file 'plugins.py', in '<module>'
#35 file '<stdin>', in '<module>'
(gdb) info threads
2 Thread 0x7fe956708700 (LWP 25635) 0x0000003806e0d720 in sem_wait ()
from /lib64/libpthread.so.0
* 1 Thread 0x7fe96163b700 (LWP 25615) 0x00000038066e0d03 in select ()
from /lib64/libc.so.6
(gdb) thread 2
[Switching to thread 2 (Thread 0x7fe956708700 (LWP 25635))]#0
0x0000003806e0d720 in sem_wait () from /lib64/libpthread.so.0
(gdb) py-bt
#1 Waiting for a lock (e.g. GIL)
#7 file
'/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/packet.py',
in 'compute_hmac'
#10 file
'/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/packet.py',
in 'read_message'
#13 file
'/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/transport.py',
in 'run'
#16 file '/usr/lib64/python2.6/threading.py', in '__bootstrap_inner'
#19 file '/usr/lib64/python2.6/threading.py', in '__bootstrap'
/
*but it is strange that when I use python interactive shell, the code
works well*

Regards,
Jack

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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=GB2312">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    Hello<br>
    one problem, thanks for help<br>
    <br>
    My script like this:<br>
    <i><tt>&nbsp;&nbsp;&nbsp; hostname = xxx</tt></i><i><br>
    </i><i><tt>&nbsp;&nbsp;&nbsp; username = xxx</tt></i><i><br>
    </i><i><tt>&nbsp;&nbsp;&nbsp; password = xxx</tt></i><i><br>
    </i><i><tt>&nbsp;&nbsp;&nbsp; t = paramiko.Transport((hostname, 22))</tt></i><i><br>
    </i><i><tt>&nbsp;&nbsp;&nbsp; t.connect(username=username, password=password)</tt></i><i>&nbsp;&nbsp;&nbsp;
      # here will be blocked<br>
    </i><i><tt>&nbsp;&nbsp;&nbsp; sftp = paramiko.SFTPClient.from_transport(t)</tt></i><br>
    <br>
    I used gdb attach the python process, found that:<br>
    <i><small>(gdb) py-bt<br>
        #2 &lt;built-in function sleep&gt;<br>
        #4 file '/usr/lib64/python2.6/threading.py', in 'wait'<br>
        #8 file '/usr/lib64/python2.6/threading.py', in 'wait'<br>
        #12 file
        '/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/auth_handler.py',
        in 'wait_for_response'<br>
        #15 file
        '/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/transport.py',
        in 'auth_password'<br>
        #19 file
        '/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/transport.py',
        in 'connect'<br>
        #23 file 'plugins.py', in '&lt;module&gt;'<br>
        #35 file '&lt;stdin&gt;', in '&lt;module&gt;'<br>
        (gdb) info threads<br>
        &nbsp; 2 Thread 0x7fe956708700 (LWP 25635)&nbsp; 0x0000003806e0d720 in
        sem_wait () from /lib64/libpthread.so.0<br>
        * 1 Thread 0x7fe96163b700 (LWP 25615)&nbsp; 0x00000038066e0d03 in
        select () from /lib64/libc.so.6<br>
        (gdb) thread 2<br>
        [Switching to thread 2 (Thread 0x7fe956708700 (LWP 25635))]#0&nbsp;
        0x0000003806e0d720 in sem_wait () from /lib64/libpthread.so.0<br>
        (gdb) py-bt<br>
        #1 Waiting for a lock (e.g. GIL)<br>
        #7 file
        '/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/packet.py',
        in 'compute_hmac'<br>
        #10 file
        '/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/packet.py',
        in 'read_message'<br>
        #13 file
        '/usr/lib/python2.6/site-packages/paramiko-1.9.0-py2.6.egg/paramiko/transport.py',
        in 'run'<br>
        #16 file '/usr/lib64/python2.6/threading.py', in
        '__bootstrap_inner'<br>
        #19 file '/usr/lib64/python2.6/threading.py', in '__bootstrap'<br>
      </small></i><br>
    <b>but it is strange that when I use python interactive shell, the
      code works well</b><br>
    <br>
    Regards,<br>
    Jack<br>
  </body>
</html>

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