serf buildbot FAIL on trunk@1407545

The centos buildbot failed on trunk_at_1407545. I can't reproduce it. The
failing update produces:

 U svn-test-work/working_copies/special_tests-25/s-type
U svn-test-work/working_copies/special_tests-25/s-in-place
D svn-test-work/working_copies/special_tests-25/s-replace
A svn-test-work/working_copies/special_tests-25/s-replace
 U svn-test-work/working_copies/special_tests-25/s-reverse

but the buildbot appears to have missed the update to s-in-place. Is
this explainable in some way? Has serf simply dropped part of the
update? The buildbot is using serf 1.0.3 if that makes a difference.

The buildbot faillog was:

W: Couldn't find node 's-in-place' in actual output tree
W: * Node name: s-in-place
    Path: svn-test-work/working_copies/special_tests-25/s-in-place
    Contents: None
    Properties: {}
    Attributes: {'status': 'U '}
    Children: None (node is probably a file)

W: Unequal at node special_tests-25
W: Unequal at node working_copies
W: Unequal at node svn-test-work
W: ACTUAL OUTPUT TREE:
svntest.wc.State(wc_dir, {
  's-replace' : Item(status='A '),
  's-reverse' : Item(status=' U'),
  's-type' : Item(status=' U'),
})
W: CWD: /home/bt/slaves/x64-centos/build/subversion/tests/cmdline
W: EXCEPTION: SVNTreeUnequal
Traceback (most recent call last):
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/main.py", line 1415, in run
    rc = self.pred.run(sandbox)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/testcase.py", line 176, in run
    return self.func(sandbox)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/special_tests.py", line 1188, in incoming_symlink_changes
    wc_dir, '-r', '2')
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/actions.py", line 878, in run_and_verify_update
    check_props)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/actions.py", line 770, in verify_update
    tree.compare_trees("output", actual_output, output_tree)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/tree.py", line 692, in compare_trees
    singleton_handler_b, b_baton)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/tree.py", line 692, in compare_trees
    singleton_handler_b, b_baton)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/tree.py", line 692, in compare_trees
    singleton_handler_b, b_baton)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/tree.py", line 697, in compare_trees
    singleton_handler_b(b_child, b_baton)
  File "/home/bt/slaves/x64-centos/build/subversion/tests/cmdline/svntest/tree.py", line 589, in default_singleton_handler
    raise SVNTreeUnequal
SVNTreeUnequal
FAIL: special_tests.py 25: verify incoming symlink change behavior

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