autobuild[sn-devel-184]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-184) 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-184/2019-06-26-0922/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-06-26-0922/ctdb.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-06-26-0922/ctdb.stdout
  
The top commit at the time of the failure was:

commit e28365c515733bab10e93ba40c6123a57bef737f
Author: Aaron Haslett <aaronhaslett at catalyst.net.nz>
Date:   Thu Apr 11 17:44:48 2019 +1200

    selftest: schema version check in provision test
    
    Modifying blackbox provision test to check schema version.
    
    Signed-off-by: Aaron Haslett <aaronhaslett at catalyst.net.nz>
    Reviewed-by: Garming Sam <garming at catalyst.net.nz>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Wed Jun 26 05:31:03 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

 PASSED  tests/takeover/lcp2.024.sh
 PASSED  tests/takeover/lcp2.025.sh
 PASSED  tests/takeover/lcp2.027.sh
 PASSED  tests/takeover/lcp2.028.sh
 PASSED  tests/takeover/lcp2.029.sh
 PASSED  tests/takeover/lcp2.030.sh
 PASSED  tests/takeover/lcp2.031.sh
 PASSED  tests/takeover/lcp2.032.sh
 PASSED  tests/takeover/lcp2.033.sh
 PASSED  tests/takeover/lcp2.034.sh
 PASSED  tests/takeover/lcp2.035.sh
 PASSED  tests/takeover/nondet.001.sh
 PASSED  tests/takeover/nondet.002.sh
 PASSED  tests/takeover/nondet.003.sh
 PASSED  tests/takeover_helper/000.sh
 PASSED  tests/takeover_helper/010.sh
 PASSED  tests/takeover_helper/011.sh
 PASSED  tests/takeover_helper/012.sh
 PASSED  tests/takeover_helper/013.sh
 PASSED  tests/takeover_helper/014.sh
 PASSED  tests/takeover_helper/016.sh
 PASSED  tests/takeover_helper/017.sh
 PASSED  tests/takeover_helper/018.sh
 PASSED  tests/takeover_helper/019.sh
 PASSED  tests/takeover_helper/021.sh
 PASSED  tests/takeover_helper/022.sh
 PASSED  tests/takeover_helper/023.sh
 PASSED  tests/takeover_helper/024.sh
 PASSED  tests/takeover_helper/025.sh
 PASSED  tests/takeover_helper/026.sh
 PASSED  tests/takeover_helper/027.sh
 PASSED  tests/takeover_helper/028.sh
 PASSED  tests/takeover_helper/030.sh
 PASSED  tests/takeover_helper/031.sh
 PASSED  tests/takeover_helper/110.sh
 PASSED  tests/takeover_helper/111.sh
 PASSED  tests/takeover_helper/120.sh
 PASSED  tests/takeover_helper/121.sh
 PASSED  tests/takeover_helper/122.sh
 PASSED  tests/takeover_helper/130.sh
 PASSED  tests/takeover_helper/131.sh
 PASSED  tests/takeover_helper/132.sh
 PASSED  tests/takeover_helper/140.sh
*FAILED* tests/takeover_helper/150.sh

339/340 tests passed

Not cleaning up TEST_VAR_DIR=tests/var
autotest exited with exit status 1
Makefile:22: recipe for target 'autotest' failed