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-144/2018-04-17-1807/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-04-17-1807/tdb.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-04-17-1807/tdb.stdout
  
The top commit at the time of the failure was:

commit 78c3533729c99527e07813170f70bed1a3c836b2
Author: Volker Lendecke <vl at samba.org>
Date:   Fri Mar 30 12:23:47 2018 -0500

    tstream: Fix CID 1167981 Unchecked return value
    
    Signed-off-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Stefan Metzmacher <metze at samba.org>
    
    Autobuild-User(master): Volker Lendecke <vl at samba.org>
    Autobuild-Date(master): Mon Apr 16 19:09:56 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

../../script/random-sleep.sh: sleep 373 ... start
../../script/random-sleep.sh: sleep 373 ... end
WAF_MAKE=1 PATH=buildtools/bin:../../buildtools/bin:$PATH waf build
WAF_MAKE=1 PATH=buildtools/bin:../../buildtools/bin:$PATH waf install
WAF_MAKE=1 PATH=buildtools/bin:../../buildtools/bin:$PATH waf test 
...tdb1-run-3G-file
...tdb1-run-bad-tdb-header
...tdb1-run
...tdb1-run-check
...tdb1-run-corrupt
...tdb1-run-die-during-transaction
...tdb1-run-endian
...tdb1-run-incompatible
...tdb1-run-nested-transactions
...tdb1-run-nested-traverse
...tdb1-run-no-lock-during-traverse
...tdb1-run-oldhash
...tdb1-run-open-during-transaction
...tdb1-run-readonly-check
...tdb1-run-rescue
...tdb1-run-rescue-find_entry
...tdb1-run-rdlock-upgrade
...tdb1-run-rwlock-check
...tdb1-run-summary
...tdb1-run-transaction-expand
...tdb1-run-traverse-in-transaction
...tdb1-run-wronghash-fail
...tdb1-run-zero-append
...tdb1-run-fcntl-deadlock
...tdb1-run-marklock-deadlock
...tdb1-run-allrecord-traverse-deadlock
tdb1-run-allrecord-traverse-deadlock failed:
........................marklock-deadlock-fcntl.tdb tests done
.................do_allrecord_lock: traverse should fail
......ret should succeed
.Running Python test with /usr/bin/python3: python/tests/simple.py
Running Python test with /usr/bin/python: python/tests/simple.py
python testsuite returned 0