https://buildbot.python.org/all/#/builders/167/builds/1265 test_chown (test.test_os.ChownFileTests) ... ERROR ====================================================================== ERROR: test_chown (test.test_os.ChownFileTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test_os.py", line 1327, in test_chown os.chown(support.TESTFN, uid, gid_1) PermissionError: [Errno 1] Operation not permitted: '@test_95158_tmp' Extract of the test: import grp groups = [g.gr_gid for g in grp.getgrall() if getpass.getuser() in g.gr_mem] if hasattr(os, 'getgid'): process_gid = os.getgid() if process_gid not in groups: groups.append(process_gid) @unittest.skipUnless(len(groups) > 1, "test needs more than one group") def test_chown(self): gid_1, gid_2 = groups[:2] uid = os.stat(support.TESTFN).st_uid os.chown(support.TESTFN, uid, gid_1) # <======== FAIL HERE gid = os.stat(support.TESTFN).st_gid self.assertEqual(gid, gid_1) os.chown(support.TESTFN, uid, gid_2) gid = os.stat(support.TESTFN).st_gid self.assertEqual(gid, gid_2) Extract of test.pythoninfo: os.uid: 1002 os.umask: 077 os.gid: 1002 os.groups: 1002 I'm not sure that the code to manually get groups from grp.getgrall() is correct. Why not relying on the *current* groups, os.getgroups()? Note: there is also os.getgrouplist(), I'm not sure of the difference between os.getgroups() and os.getgrouplist(). I know that os.getgrouplist() was modified recently to use: /* * NGROUPS_MAX is defined by POSIX.1 as the maximum * number of supplimental groups a users can belong to. * We have to increment it by one because * getgrouplist() returns both the supplemental groups * and the primary group, i.e. all of the groups the * user belongs to. */ ngroups = 1 + MAX_GROUPS;

This looks like a reincarnation of #27838

And I just remembered that I had to restart the build worker service on that host (koobs-freebsd10) this morning as I was receiving messaging that the worker had gone missing. I ran `[koobs@10-STABLE-amd64:~] sudo /usr/local/etc/rc.d/buildslave restart` which is the same as the prevailing reproduction case in #27838 I could restart the worker to make the issue go away, but I think the underlying issue should be fixed instead. Should we close this as a dupe and reopen the original?

 New changeset 9cb274114c844f9b1c13028f812926c987a7b4a7 by Victor Stinner in branch 'master': bpo-37400: pythoninfo logs getpwuid and getgrouplist (GH-14373) https://github.com/python/cpython/commit/9cb274114c844f9b1c13028f812926c987a7b4a7 

I merged my pythoninfo change, more complete pythoninfo from the buildbot: os.getgid: 1002 os.getgrouplist: 1002 os.getgroups: 1002 os.getuid: 1002 pwd.getpwuid(1002): pwd.struct_passwd(pw_name='buildbot', pw_passwd='*', pw_uid=1002, pw_gid=1002, pw_gecos='FreeBSD BuildBot', pw_dir='/home/buildbot', pw_shell='/bin/sh') IMHO the test is wrong: it should rely on os.getgroups() rather tan "discover" groups from pw.getpwall().

I'm connected to the FreeBSD CURRENT buildbot as the user "haypo". I'm unable to reproduce the bug: CURRENT-amd64% id uid=1003(haypo) gid=1003(haypo) groups=1003(haypo) CURRENT-amd64% ./python -m test test_os -m test_chown (...) Tests result: SUCCESS Moreover, it seems like something changes on the buildbot, since the user "buildbot" now has 0 group!? $ ./python >>> [g.gr_gid for g in grp.getgrall() if 'buildbot' in g.gr_mem] [] Or maybe as the user "haypo", I cannot see *all* groups. In case of doubt, I will blindly apply my fix PR 14374.

 New changeset d7c87d982d4ec4ba201bcee14324ae5e0e90581f by Victor Stinner in branch 'master': bpo-37400: Fix test_os.test_chown() (GH-14374) https://github.com/python/cpython/commit/d7c87d982d4ec4ba201bcee14324ae5e0e90581f 

 New changeset 12d174bed9960ded1d072035c57f82e10a89f0d6 by Miss Islington (bot) in branch '3.8': bpo-37400: Fix test_os.test_chown() (GH-14374) https://github.com/python/cpython/commit/12d174bed9960ded1d072035c57f82e10a89f0d6 

 New changeset 1d4b6ba19466aba0eb91c4ba01ba509acf18c723 by Victor Stinner (Miss Islington (bot)) in branch '3.7': bpo-37400: Fix test_os.test_chown() (GH-14374) (GH-14378) https://github.com/python/cpython/commit/1d4b6ba19466aba0eb91c4ba01ba509acf18c723 

I merged my fix. I close the issue and hope that the test will not fail again ;-) Python 2.7 is not affected: it doesn't have test_chown().