Node._startService failed: got stderr: 'ifconfig: en6: no media types?\n'

[guyzmo]

Hi,

I configured successfully an introducer node on a debian box. Now I want to configure a client on my OSX box. So I've done :

• % tahoe create-client
• then ~/.tahoe got created
• % tahoe start
• then it outputs :

  STARTING /Users/guyzmo/.tahoe
  /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/twisted/persisted/sob.py:12: DeprecationWarning: the md5 module is deprecated; use hashlib instead
    import os, md5, sys
  /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/twisted/python/filepath.py:12: DeprecationWarning: the sha module is deprecated; use the hashlib module instead
    import sha
  Removing stale pidfile /Users/guyzmo/.tahoe/twistd.pid
  client node probably started
  

I'm running :

• allmydata-tahoe: 1.6.1-r4328, foolscap: 0.5.1, pycryptopp: 0.5.17-r683, zfec: 1.4.7, Twisted: 8.2.0, Nevow: 0.10.0, zope.interface: 3.5.1, python: 2.6.1, platform: Darwin-10.3.0-i386-64bit, sqlite: 3.6.12, simplejson: 2.1.1, argparse: 1.1, pyOpenSSL: 0.7, pyutil: 1.7.7, zbase32: 1.1.1, setuptools: 0.6c15dev, pysqlite: 2.4.1
• (Snow Leopard) Darwin myhost 10.3.0 Darwin Kernel Version 10.3.0: Fri Feb 26 11:58:09 PST 2010; root:xnu-1504.3.12~1/RELEASE_I386 i386

And the log twistd.log is joined with the ticket.

Just a hint : it fails with en6 in the error log, and en6 has been created by PDAnet to do mobile network tethering.

[guyzmo]

twistd log file

[zooko]

Thanks for the bug report. I don't recognize this and I'm just guessing, but could you try upgrading to the latest release of Twisted? It shows there that you are using Twisted 8.2.0. The current release is Twisted 10.0.0. Thanks!

[guyzmo]

Just a hint : it fails with en6 in the error log, and en6 has been created by vmware-fusion to connect to virtual machines (but it's not running).

well, after some investigations, it has not been created by vmware fusion, it's been created by PDAnet, a tool that does mobile phone tethering through USB... basically it's like a point-to-point tun interface, so I shall report the bug to them. Meanwhile, I'm gonna try to find out if I can't work out a patch to just catch that exception and make it ignore it (as that network interface is not meant to be used by tahoe-lafs)

[zooko]

Just so people don't have to click through to the twistd.log to see, here is the fatal error:

12	2010-05-31 17:15:34+0200 [-] Unhandled Error
13	        Traceback (most recent call last):
14	        Failure: twisted.internet.utils._UnexpectedErrorOutput: got stderr: 'ifconfig: en6: no media types?\n'
15	       
16	2010-05-31 17:15:34+0200 [-] Node._startService failed, aborting
17	2010-05-31 17:15:34+0200 [-] [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.utils._UnexpectedErrorOutput'>: got stderr: 'ifconfig: en6: no media types?\n'
18	2010-05-31 17:15:34+0200 [-] ]
19	2010-05-31 17:15:34+0200 [-] calling os.abort()
20	2010-05-31 17:15:34+0200 [-] calling os.abort()

[guyzmo]

The only way I got around this bug is to launch PDAnet while lauching tahoe.

If someone can tell me how can I get full tracebacks in the twistd.log when launching tahoe, I may write a patch that ignores that kind of errors (as all is needed is to have at least one interface working, not all interfaces)... having it around may be useful for a future user that gets into the same kind of troubles I went into.

[zooko]

Replying to guyzmo:

The only way I got around this bug is to launch PDAnet while lauching tahoe.

What do you mean? Launching PDAnet while launching Tahoe-LAFS causes this bug to occur? Or does it cause this bug to stop occurring?

If someone can tell me how can I get full tracebacks in the twistd.log when launching tahoe,

docs/logging.txt

[zooko]

See #1988

[daira]

guyzmo: on your system, in the configuration that previously failed, does the command ip addr appear to work?

[Daira Hopwood <david-sarah@…>]

In a493ee0bb641175ecf918e28fce4d25df15994b6/trunk:

iputil.py: add tests for recent changes. refs #1381, #1988, #982, #1064, #1536, #1935, #898, #1707, #1918

Signed-off-by: Daira Hopwood <david-sarah@…>

[daira]

guyzmo, please try to reproduce this with current Tahoe-LAFS trunk.

[daira]

Note that as a side-effect of the fix to #754 (which will be released in Tahoe-LAFS 1.10.1), setting tub.location without including "AUTO" will skip the local IP auto-detection code entirely, thus allowing a workaround for this problem if the other changes on trunk didn't fix it.

[exarkun]

​https://github.com/tahoe-lafs/tahoe-lafs/pull/872 removed the use if ifconfig entirely

[exarkun]

pull 872 merged in ​https://github.com/tahoe-lafs/tahoe-lafs/commit/25ee76104ad15e78b33a15643e330d2ec285dc89