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-144/2018-06-14-0628/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-14-0628/samba-ad-dc.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-14-0628/samba-ad-dc.stdout
  
The top commit at the time of the failure was:

commit d33c355103406ceb4941a479f34ea33eae8e87a7
Author: Swen Schillig <swen at vnet.ibm.com>
Date:   Fri May 25 12:45:35 2018 +0200

    CID 1416475: possibly dereferencing NULL in fruit_pread_meta
    
    Signed-off-by: Swen Schillig <swen at vnet.ibm.com>
    Reviewed-by: Christof Schmitt <cs at samba.org>
    Reviewed-by: Ralph Boehme <slow at samba.org>
    
    Autobuild-User(master): Ralph Böhme <slow at samba.org>
    Autobuild-Date(master): Wed Jun 13 16:29:48 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[148(778)/546 at 9m19s] samba3.rpc.samr.passwords.validate over ncacn_ip_tcp (ad_dc)
[149(779)/546 at 9m19s] samba3.rpc.netlogon.admin(ad_dc)
[150(788)/546 at 9m22s] samba3.rpc.schannel(ad_dc)
[151(789)/546 at 9m45s] samba3.rpc.schannel2(ad_dc)
[152(790)/546 at 9m46s] samba3.rpc.schannel_anon_setpw anonymous password set(ad_dc)
[153(791)/546 at 9m46s] samba3.rpc.join(ad_dc)
[154(792)/546 at 9m49s] samba3.rpc.bind(ad_dc)
[155(800)/546 at 9m52s] samba3.unix.info2(ad_dc)
[156(801)/546 at 9m52s] samba3.unix.whoami machine account(ad_member:local)
[157(802)/546 at 9m53s] samba3.unix.whoami(ad_dc)
[158(803)/546 at 9m54s] samba3.unix.whoami kerberos connection(ad_dc)
[159(804)/546 at 9m54s] samba3.unix.whoami anonymous connection(ad_dc)
[160(805)/546 at 9m54s] samba3.unix.whoami ntlm user at realm(ad_dc)
[161(806)/546 at 9m54s] samba3.unix.whoami(ad_member)
[162(807)/546 at 9m55s] samba3.unix.whoami kerberos connection(ad_member)
[163(808)/546 at 9m55s] samba3.unix.whoami anonymous connection(ad_member)
[164(809)/546 at 9m55s] samba3.unix.whoami ntlm user at realm(ad_member)
[165(810)/546 at 9m56s] samba3.local.nss(ad_member:local)
[166(815)/546 at 10m13s] samba3.local.nss(ad_dc:local)
[167(820)/546 at 11m28s] samba3.rap.basic(ad_dc)
[168(826)/546 at 11m29s] samba3.rap.rpc(ad_dc)
[169(827)/546 at 11m30s] samba3.rap.printing(ad_dc)
[170(838)/546 at 11m36s] samba3.rap.sam(ad_dc)
[171(843)/546 at 11m37s] samba3.nbt.dgram(ad_dc)
[172(846)/546 at 11m39s] samba3.libsmbclient(ad_dc)
mkdir failed on directory /m/autobuild/fl/b211981/prefix/samba-ad-dc/var/cache: No such file or directory
mkdir failed on directory /m/autobuild/fl/b211981/prefix/samba-ad-dc/var/cache: No such file or directory
mkdir failed on directory /m/autobuild/fl/b211981/prefix/samba-ad-dc/var/cache: No such file or directory
mkdir failed on directory /m/autobuild/fl/b211981/prefix/samba-ad-dc/var/cache: No such file or directory
mkdir failed on directory /m/autobuild/fl/b211981/prefix/samba-ad-dc/var/cache: No such file or directory
mkdir failed on directory /m/autobuild/fl/b211981/prefix/samba-ad-dc/var/cache: No such file or directory
UNEXPECTED(failure): samba3.libsmbclient.readdirplus(ad_dc)
REASON: Exception: Exception: ../source4/torture/libsmbclient/libsmbclient.c:262: failed to create file 'smb://Administrator:locDCpass1@addc/tmp/test_readdirplus.txt': Software caused connection abort

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
samba3.local.nss(ad_dc:local) -> 75
samba3.raw.session krb5(ad_dc) -> 52
samba3.rpc.samr.passwords.pwdlastset(ad_dc) -> 51
samba3.smb2.session krb5(ad_dc) -> 36
samba3.rpc.schannel(ad_dc) -> 23
samba3.smb2.dir(ad_dc) -> 21
samba3.base.delete(ad_dc) -> 20
samba3.base.defer_open(ad_dc) -> 18
samba3.smb2.ioctl(ad_dc) -> 18
samba3.rpc.spoolss.printer(ad_dc) -> 18
ERROR: test failed with exit code 1