autobuild[sn-devel-144]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-01-15-0032/flakey.log

The failure seems to be in the "samba-xc" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-01-15-0032/samba-xc.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-01-15-0032/samba-xc.stdout
  
The top commit at the time of the failure was:

commit 6619cec3dec8c8a2116d111aea7e5440875d0fa8
Author: Ralph Boehme <slow at samba.org>
Date:   Mon Jan 14 13:51:23 2019 +0100

    s3:smbd: perform impersonation in smb2_query_directory_fetch_write_time_done()
    
    This is not strictly required, as we ne never trigger additional VFS
    requests via this codepath. But for safety reasons ensure we're running
    in the correct impersonation state.
    
    Signed-off-by: Ralph Boehme <slow at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Mon Jan 14 22:30:24 CET 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

PERFCOUNT_SHARED: perfcount_test
RPC_STATIC: 
RPC_SHARED: 
Checking for openpty                                                                            : not found 
Checking for library util                                                                       : yes 
Checking for openpty                                                                            : ok 
Checking for header linux/sockios.h                                                             : Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Scripting.py", line 158, in waf_entry_point
    run_commands()
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Scripting.py", line 251, in run_commands
    ctx = run_command(cmd_name)
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Scripting.py", line 235, in run_command
    ctx.execute()
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Configure.py", line 159, in execute
    super(ConfigurationContext, self).execute()
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Context.py", line 204, in execute
    self.recurse([os.path.dirname(g_module.root_path)])
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Context.py", line 286, in recurse
    user_function(self)
  File "/memdisk/autobuild/fl/b2924336/samba-xc/wscript", line 315, in configure
    conf.RECURSE('lib/socket')
  File "./buildtools/wafsamba/samba_utils.py", line 33, in fun
    return f(*k, **kw)
  File "./buildtools/wafsamba/samba_utils.py", line 436, in RECURSE
    return ctx.recurse(relpath)
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Context.py", line 286, in recurse
    user_function(self)
  File "/memdisk/autobuild/fl/b2924336/samba-xc/lib/socket/wscript", line 4, in configure
    conf.CHECK_HEADERS('linux/sockios.h linux/ethtool.h')
  File "./buildtools/wafsamba/samba_utils.py", line 33, in fun
    return f(*k, **kw)
  File "./buildtools/wafsamba/samba_autoconf.py", line 132, in CHECK_HEADERS
    if not CHECK_HEADER(conf, hdr, set_add_headers, lib=lib):
  File "./buildtools/wafsamba/samba_autoconf.py", line 107, in CHECK_HEADER
    msg="Checking for header %s" % h)
  File "./buildtools/wafsamba/samba_utils.py", line 33, in fun
    return f(*k, **kw)
  File "./buildtools/wafsamba/samba_waf18.py", line 174, in check
    ret = self.run_build(*k, **kw)
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Configure.py", line 316, in fun
    return f(*k, **kw)
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Configure.py", line 584, in run_build
    bld.compile()
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Build.py", line 352, in compile
    self.store()
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Build.py", line 319, in store
    Utils.writef(db + '.tmp', x, m='wb')
  File "/memdisk/autobuild/fl/b2924336/samba-xc/third_party/waf/waflib/Utils.py", line 265, in writef
    f.write(data)
OSError: [Errno 28] No space left on device