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-144/2018-10-23-0718/flakey.log

The failure seems to be in the "samba-none-env" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-10-23-0718/samba-none-env.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-10-23-0718/samba-none-env.stdout
  
The top commit at the time of the failure was:

commit fbea9d36996f248ba2b077f12ad16c199b853134
Author: Martin Schwenke <martin at meltin.net>
Date:   Wed Oct 17 17:19:06 2018 +1100

    ctdb-daemon: Fix valgrind hit in event code
    
    ==25741== Syscall param write(buf) points to uninitialised byte(s)
    ==25741==    at 0x4939291: write (write.c:27)
    ==25741==    by 0x4868285: sys_write (sys_rw.c:68)
    ==25741==    by 0x13915D: sock_queue_trigger (sock_io.c:316)
    ==25741==    by 0x4DE6478: tevent_common_invoke_immediate_handler (in /usr/lib/x86_64-linux-gnu/libtevent.so.0.9.37)
    ==25741==    by 0x4DE64A2: tevent_common_loop_immediate (in /usr/lib/x86_64-linux-gnu/libtevent.so.0.9.37)
    ==25741==    by 0x4DEBE5A: ??? (in /usr/lib/x86_64-linux-gnu/libtevent.so.0.9.37)
    ==25741==    by 0x4DEA2D6: ??? (in /usr/lib/x86_64-linux-gnu/libtevent.so.0.9.37)
    ==25741==    by 0x4DE57E3: _tevent_loop_once (in /usr/lib/x86_64-linux-gnu/libtevent.so.0.9.37)
    ==25741==    by 0x15D1BA: ctdb_event_script_args (eventscript.c:821)
    ==25741==    by 0x13B437: ctdb_start_daemon (ctdb_daemon.c:1315)
    ==25741==    by 0x110642: main (ctdbd.c:393)
    ==25741==  Address 0x57888a4 is 100 bytes inside a block of size 144 alloc'd
    ==25741==    at 0x48357BF: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
    ==25741==    by 0x4B9B7C0: talloc_named_const (in /usr/lib/x86_64-linux-gnu/libtalloc.so.2.1.14)
    ==25741==    by 0x15CCC6: eventd_client_write (eventscript.c:430)
    ==25741==    by 0x15CCC6: eventd_client_run (eventscript.c:556)
    ==25741==    by 0x15CCC6: ctdb_event_script_run (eventscript.c:649)
    ==25741==    by 0x15D198: ctdb_event_script_args (eventscript.c:812)
    ==25741==    by 0x13B437: ctdb_start_daemon (ctdb_daemon.c:1315)
    ==25741==    by 0x110642: main (ctdbd.c:393)
    ==25741==
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13659
    
    Pair-programmed-with: Amitay Isaacs <amitay at gmail.com>
    Signed-off-by: Martin Schwenke <martin at meltin.net>
    Reviewed-by: Amitay Isaacs <amitay at gmail.com>
    
    Autobuild-User(master): Amitay Isaacs <amitay at samba.org>
    Autobuild-Date(master): Mon Oct 22 09:27:15 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[182(3105)/217 at 26m48s] pidl.samba3-srv
[183(3106)/217 at 26m48s] pidl.tdr
[184(3112)/217 at 26m49s] pidl.test_util
[185(3118)/217 at 26m49s] pidl.typelist
[186(3174)/217 at 26m50s] pidl.util
[187(3246)/217 at 26m51s] pidl.wireshark-conf
[188(3295)/217 at 26m52s] pidl.wireshark-ndr
[189(3335)/217 at 26m53s] tdb.python
[190(3389)/217 at 26m54s] samba.tests.dsdb_lock
[191(3396)/217 at 28m10s] samba.tests.samba_tool.visualize
[192(3407)/217 at 28m13s] samba.tests.samba_tool.provision_password_check
[193(3411)/217 at 28m21s] samba.tests.samba_tool.help
[194(3412)/217 at 29m1s] samba.tests.domain_backup_offline
[195(3416)/217 at 30m39s] samba.tests.lsa_string
[196(3420)/217 at 30m39s] samba.tests.loadparm
[197(3423)/217 at 30m40s] samba4.blackbox.samba3dump
[198(3424)/217 at 30m40s] samba4.blackbox.upgrade
[199(3432)/217 at 31m8s] samba4.blackbox.provision.py
[200(3439)/217 at 31m59s] samba4.blackbox.supported_features
[201(3445)/217 at 32m8s] samba4.blackbox.start_backup
[202(3448)/217 at 32m17s] samba4.blackbox.upgradeprovision.current
[203(3455)/217 at 33m43s] samba4.blackbox.setpassword.py
[204(3461)/217 at 33m54s] samba4.blackbox.newuser.py
[205(3472)/217 at 34m7s] samba4.blackbox.group.py
[206(3501)/217 at 34m26s] samba4.blackbox.provision-backend
[207(3505)/217 at 34m34s] samba4.blackbox.renamedc.sh
[208(3516)/217 at 34m57s] samba4.dsdb.samdb.ldb_modules.unique_object_sids
[209(3522)/217 at 34m57s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.tdb
[210(3533)/217 at 34m57s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.mdb
[211(3544)/217 at 34m57s] lib.audit_logging.audit_logging
UNEXPECTED(failure): lib.audit_logging.audit_logging.test_audit_get_timestamp(none)
REASON: Exception: Exception: difftime(after, actual) >= 0
../lib/audit_logging/tests/audit_logging_test.c:827: error: Failure!

FAILED (1 failures, 0 errors and 0 unexpected successes in 0 testsuites)

A summary with detailed information can be found in:
  ./bin/ab/summary
TOP 10 slowest tests
samba.tests.docs -> 351
samba4.blackbox.upgradeprovision.alpha13 -> 186
samba4.blackbox.upgradeprovision.release-4-0-0 -> 175
samba4.blackbox.schemaupgrade -> 127
samba4.blackbox.dbcheck.release-4-0-0 -> 115
samba.tests.domain_backup_offline -> 99
samba4.blackbox.dbcheck.release-4-1-0rc3 -> 95
samba4.blackbox.upgradeprovision.current -> 86
ldb.python -> 78
samba4.blackbox.dbcheck.alpha13 -> 77
ERROR: test failed with exit code 1