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-184/2019-04-25-0330/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-184/2019-04-25-0330/ctdb.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-04-25-0330/ctdb.stdout
  
The top commit at the time of the failure was:

commit 94f2ed3eb35b94d5152578dbb6d5ee8f2fa2da69
Author: Christof Schmitt <cs at samba.org>
Date:   Wed Apr 24 10:16:30 2019 -0700

    wscript: Remove checks for shm_open and shmget
    
    Commit 74a16a1094278 "s3:smbprofile: Replace sysv shmem with tdb"
    removed the usage of the shared memory segment for profiling data. As
    there are no other users of shared memory segments, remove the configure
    check for these functions.
    
    Signed-off-by: Christof Schmitt <cs at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Thu Apr 25 00:54:16 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

 PASSED  tests/tool/ctdb.setdbsticky.003.sh
 PASSED  tests/tool/ctdb.setdbsticky.004.sh
 PASSED  tests/tool/ctdb.setdbsticky.005.sh
 PASSED  tests/tool/ctdb.setdebug.001.sh
 PASSED  tests/tool/ctdb.setdebug.002.sh
 PASSED  tests/tool/ctdb.setdebug.003.sh
 PASSED  tests/tool/ctdb.setifacelink.001.sh
 PASSED  tests/tool/ctdb.setifacelink.002.sh
 PASSED  tests/tool/ctdb.setvar.001.sh
 PASSED  tests/tool/ctdb.setvar.002.sh
 PASSED  tests/tool/ctdb.status.001.sh
 PASSED  tests/tool/ctdb.status.002.sh
 PASSED  tests/tool/ctdb.stop.001.sh
 PASSED  tests/tool/ctdb.stop.002.sh
 PASSED  tests/tool/ctdb.stop.003.sh
 PASSED  tests/tool/ctdb.unban.001.sh
 PASSED  tests/tool/ctdb.unban.002.sh
 PASSED  tests/tool/ctdb.unban.003.sh
 PASSED  tests/tool/ctdb.uptime.001.sh
 PASSED  tests/tool/ctdb.writekey.001.sh
 PASSED  tests/simple/00_ctdb_onnode.sh
 PASSED  tests/simple/01_ctdb_reclock_command.sh
 PASSED  tests/simple/02_ctdb_tunables.sh
 PASSED  tests/simple/05_ctdb_listnodes.sh
 PASSED  tests/simple/06_ctdb_getpid.sh
 PASSED  tests/simple/07_ctdb_process_exists.sh
 PASSED  tests/simple/08_ctdb_isnotrecmaster.sh
 PASSED  tests/simple/09_ctdb_ping.sh
 PASSED  tests/simple/11_ctdb_ip.sh
 PASSED  tests/simple/12_ctdb_getdebug.sh
 PASSED  tests/simple/13_ctdb_setdebug.sh
 PASSED  tests/simple/14_ctdb_statistics.sh
 PASSED  tests/simple/15_ctdb_statisticsreset.sh
 PASSED  tests/simple/16_ctdb_config_add_ip.sh
 PASSED  tests/simple/17_ctdb_config_delete_ip.sh
 PASSED  tests/simple/18_ctdb_reloadips.sh
 PASSED  tests/simple/19_ip_takeover_noop.sh
 PASSED  tests/simple/20_delip_iface_gc.sh
 PASSED  tests/simple/21_ctdb_attach.sh
 PASSED  tests/simple/23_ctdb_moveip.sh
 PASSED  tests/simple/24_ctdb_getdbmap.sh
 PASSED  tests/simple/25_dumpmemory.sh
 PASSED  tests/simple/26_ctdb_config_check_error_on_unreachable_ctdb.sh
*FAILED* tests/simple/27_ctdb_detach.sh

504/505 tests passed

Removing TEST_VAR_DIR=tests/var
autotest exited with exit status 1
Makefile:22: recipe for target 'autotest' failed