It occurs on PPC Leopard 3.x buildbot.

(...)
[184/346] test_ssl
error: uncaptured python exception,
closing channel <smtpd.SMTPChannel connected 'c' at 0x3593850>
(<class 'IndexError'>:pop from empty list
[/Users/buildbot/buildarea/3.x.parc-leopard-1/build/Lib/asyncore.py|read|79]
[/Users/buildbot/buildarea/3.x.parc-leopard-1/build/Lib/asyncore.py|handle_read_event|435]
[/Users/buildbot/buildarea/3.x.parc-leopard-1/build/Lib/asynchat.py|handle_read|128]
[/Users/buildbot/buildarea/3.x.parc-leopard-1/build/Lib/asyncore.py|recv|375]
[/Users/buildbot/buildarea/3.x.parc-leopard-1/build/Lib/test/mock_socket.py|recv|47])
(...)

http://www.python.org/dev/buildbot/all/builders/PPC%20Leopard%203.x/builds/295

Could this be related to Issue5154?

I've noticed in the past that some asyncore/asychat tests print stacktraces as well, all of them in the testcases that use poll instead of select.

It's very hard to tell what went wrong without an actual traceback message. What I don't understand is why smtpd module is mentioned in the message, since apparently test_ssl.py doesn't use it at all.

$ python2.7 test/test_asyncore.py -v
test_closeall (__main__.HelperFunctionTests) ... ok
test_closeall_default (__main__.HelperFunctionTests) ... ok
test_compact_traceback (__main__.HelperFunctionTests) ... ok
test_readwrite (__main__.HelperFunctionTests) ... ok
test_readwriteexc (__main__.HelperFunctionTests) ... ok
test_basic (__main__.DispatcherTests) ... ok
test_issue_8594 (__main__.DispatcherTests) ... ok
test_log (__main__.DispatcherTests) ... ok
test_log_info (__main__.DispatcherTests) ... ok
test_repr (__main__.DispatcherTests) ... ok
test_strerror (__main__.DispatcherTests) ... ok
test_unhandled (__main__.DispatcherTests) ... ok
test_send (__main__.DispatcherWithSendTests) ... ok
test_send (__main__.DispatcherWithSendTests_UsePoll) ... ok
test_bind (__main__.TestAPI_UseSelect) ... ok
test_connection_attributes (__main__.TestAPI_UseSelect) ... ok
test_create_socket (__main__.TestAPI_UseSelect) ... ok
test_handle_accept (__main__.TestAPI_UseSelect) ... ok
test_handle_close (__main__.TestAPI_UseSelect) ... ok
test_handle_connect (__main__.TestAPI_UseSelect) ... ok
test_handle_error (__main__.TestAPI_UseSelect) ... ok
test_handle_expt (__main__.TestAPI_UseSelect) ... ok
test_handle_read (__main__.TestAPI_UseSelect) ... ok
test_handle_write (__main__.TestAPI_UseSelect) ... ok
test_set_reuse_addr (__main__.TestAPI_UseSelect) ... ok
test_bind (__main__.TestAPI_UsePoll) ... ok
test_connection_attributes (__main__.TestAPI_UsePoll) ... ok
test_create_socket (__main__.TestAPI_UsePoll) ... ok
test_handle_accept (__main__.TestAPI_UsePoll) ... ok
test_handle_close (__main__.TestAPI_UsePoll) ... ok
test_handle_connect (__main__.TestAPI_UsePoll) ... ok
test_handle_error (__main__.TestAPI_UsePoll) ... ok
test_handle_expt (__main__.TestAPI_UsePoll) ... ok
test_handle_read (__main__.TestAPI_UsePoll) ... ok
test_handle_write (__main__.TestAPI_UsePoll) ... ok
test_set_reuse_addr (__main__.TestAPI_UsePoll) ... ok
test_dispatcher (__main__.FileWrapperTest) ... error: uncaptured python exception, closing channel <__main__.FileDispatcher at 0x70db48> (<type 'exceptions.AttributeError'>:file_wrapper instance has no attribute 'getsockopt' [/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py|readwrite|106] [/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py|handle_write_event|449])
ERROR
test_recv (__main__.FileWrapperTest) ... ok
test_send (__main__.FileWrapperTest) ... ok

======================================================================
ERROR: test_dispatcher (__main__.FileWrapperTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test/test_asyncore.py", line 441, in test_dispatcher
    asyncore.loop(timeout=0.01, use_poll=True, count=2)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 214, in loop
    poll_fun(timeout, map)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 195, in poll2
    readwrite(obj, flags)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 119, in readwrite
    obj.handle_error()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 489, in handle_error
    self.handle_close()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 508, in handle_close
    self.close()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 396, in close
    self.socket.close()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 614, in close
    os.close(self.fd)
OSError: [Errno 9] Bad file descriptor

----------------------------------------------------------------------
Ran 39 tests in 1.445s

FAILED (errors=1)
Traceback (most recent call last):
  File "test/test_asyncore.py", line 721, in <module>
    test_main()
  File "test/test_asyncore.py", line 718, in test_main
    run_unittest(*tests)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_support.py", line 1055, in run_unittest
    _run_suite(suite)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_support.py", line 1038, in _run_suite
    raise TestFailed(err)
test.test_support.TestFailed: Traceback (most recent call last):
  File "test/test_asyncore.py", line 441, in test_dispatcher
    asyncore.loop(timeout=0.01, use_poll=True, count=2)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 214, in loop
    poll_fun(timeout, map)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 195, in poll2
    readwrite(obj, flags)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 119, in readwrite
    obj.handle_error()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 489, in handle_error
    self.handle_close()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 508, in handle_close
    self.close()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 396, in close
    self.socket.close()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/asyncore.py", line 614, in close
    os.close(self.fd)
OSError: [Errno 9] Bad file descriptor

probably related to issue #5154 mentioned in previous comment: http://bugs.python.org/issue9610#msg114000