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Both of my FreeBSD ZFS slaves (8.2 and 9.1) have chflags tests failing as follows:
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ERROR: test_chflags (test.test_posix.PosixTester)
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Traceback (most recent call last):
 File "/home/buildslave/cpython/3.2.snakebite-freebsd91-amd64/build/Lib/test/test_posix.py", line 350, in test_chflags
 self._test_chflags_regular_file(posix.chflags, support.TESTFN)
 File "/home/buildslave/cpython/3.2.snakebite-freebsd91-amd64/build/Lib/test/test_posix.py", line 337, in _test_chflags_regular_file
 chflags_func(target_file, st.st_flags | stat.UF_IMMUTABLE)
OSError: [Errno 45] Operation not supported: '@test_48794_tmp'
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ERROR: test_lchflags_regular_file (test.test_posix.PosixTester)
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Traceback (most recent call last):
 File "/home/buildslave/cpython/3.2.snakebite-freebsd91-amd64/build/Lib/test/test_posix.py", line 354, in test_lchflags_regular_file
 self._test_chflags_regular_file(posix.lchflags, support.TESTFN)
 File "/home/buildslave/cpython/3.2.snakebite-freebsd91-amd64/build/Lib/test/test_posix.py", line 337, in _test_chflags_regular_file
 chflags_func(target_file, st.st_flags | stat.UF_IMMUTABLE)
OSError: [Errno 45] Operation not supported: '@test_48794_tmp'
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ERROR: test_lchflags_symlink (test.test_posix.PosixTester)
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Traceback (most recent call last):
 File "/home/buildslave/cpython/3.2.snakebite-freebsd91-amd64/build/Lib/test/test_posix.py", line 367, in test_lchflags_symlink
 dummy_symlink_st.st_flags | stat.UF_IMMUTABLE)
OSError: [Errno 45] Operation not supported: '/tmp/@test_48794_tmp-dummy-symlink'
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From the FreeBSD chflags(1) manual page:
 The flags are specified as an octal number or a comma separated list of
 keywords. The following keywords are currently defined:
 arch, archived
 set the archived flag (super-user only)
 opaque set the opaque flag (owner or super-user only)
 nodump set the nodump flag (owner or super-user only)
 sappnd, sappend
 set the system append-only flag (super-user only)
 schg, schange, simmutable
 set the system immutable flag (super-user only)
 sunlnk, sunlink
 set the system undeletable flag (super-user only)
 uappnd, uappend
 set the user append-only flag (owner or super-user only)
 uchg, uchange, uimmutable
 set the user immutable flag (owner or super-user only)
 uunlnk, uunlink
 set the user undeletable flag (owner or super-user only)
That indicates only root can set the immutable flag -- but if this were the case, I wonder why none of the other FreeBSD build slaves have run into it?
Either way, placeholder issue until I can spend some more time on it.