[Buildbot-devel] buildbot slave hangs on SunOS?

Ed Hartnett ed at unidata.ucar.edu
Tue Feb 3 14:52:47 UTC 2004

Brian Warner <warner-buildbot at lothar.com> writes:

> > 	  File "/opt/lib/python2.2/site-packages/twisted/internet/default.py", line 162, in spawnProcess
> > 	    return process.PTYProcess(self, executable, args, env, path, processProtocol, uid, gid, usePTY)
> > 	  File "/opt/lib/python2.2/site-packages/twisted/internet/process.py", line 509, in __init__
> > 	    stderr.flush()
> > 	exceptions.IOError: [Errno 9] Bad file number
> > 	
> > 2004/01/27 09:22 MST [-] Malformed file descriptor found.  Preening lists.
> > 2004/01/27 09:22 MST [-] bad descriptor <twisted.internet.tcp.Client to ('rodney', 8007) at 82a2f74>
> > 2004/01/27 09:22 MST [-] bad descriptor <twisted.internet.tcp.Client to ('rodney', 8007) at 82a2f74>
> Eww. That's weird.
> It looks like stderr.flush() is only called when the child process (after
> fork) experienced some other error, like execvpe failing because it couldn't
> find the command or something. There should have been a message written to
> stdout or stderr with the exception.. it wouldn't be written to the log, but
> rather to the stdout of the twistd process, which probably goes away when
> twistd daemonizes. The error in .flush() might be related to twistd closing
> fd 1, but then I don't know why the original os.fdopen didn't fail, and why
> you're able to see the log message at all.
> Try running that buildslave in the foreground (twistd -n) and watch the
> stdout/stderr to see if it emits more information.
> If that doesn't help, maybe it's something more esoteric. Does the Twisted
> test suite pass on that system? (from the top of the Twisted source tree, do
> './bin/trial -v twisted.test'. It takes maybe 5 minutes).
> If so, try editing slavecommand.py and set the 'usePTY = 1' at line 170ish to
> =0. That will use regular pipes instead of a PTY for the child process. PTYs
> are one of those funky system-dependent things, and maybe Solaris does it
> just differently enough that it exposes a bug.
> Also, if possible, try running the slave under python2.3 instead of 2.2,
> maybe there's a difference in the behavior of the built-in python libraries
> that are responsible for creating PTYs.
> weird,
>  -Brian

OK, I upgraded to Python 2.3.3 and reinstalled twisted and
buildbot. That seemed to take care of the above problem..



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