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-144/2018-05-08-1906/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-05-08-1906/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-05-08-1906/samba.stdout
  
The top commit at the time of the failure was:

commit 2073fd0956a1c26220ae05d87e965095b9ce1b2f
Author: Amitay Isaacs <amitay at gmail.com>
Date:   Tue May 8 15:25:12 2018 +1000

    third_party: Update popt to 1.16 release
    
    Signed-off-by: Amitay Isaacs <amitay at gmail.com>
    Reviewed-by: Andreas Schneider <asn at samba.org>
    
    Autobuild-User(master): Andreas Schneider <asn at cryptomilk.org>
    Autobuild-Date(master): Tue May  8 12:55:04 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[615(3425)/843 at 46m54s] samba4.rpc.echo against s4member server with local creds(s4member)
[616(3435)/843 at 46m57s] samba4.rpc.echo against s4member server with domain creds(s4member)
[617(3445)/843 at 47m1s] samba4.rpc.samr against s4member server with local creds(s4member)
[618(3445)/843 at 47m1s] samba4.rpc.samr.users against s4member server with local creds(s4member)
[619(3445)/843 at 47m4s] samba4.blackbox.smbclient against s4member server with local creds(s4member)
[620(3490)/843 at 47m8s] samba4.rpc.echo against rpc proxy with domain creds(rpc_proxy)
[621(3500)/843 at 47m11s] samba4.smb.signing on with -k no --signing=on(ad_dc_ntvfs)
[622(3501)/843 at 47m11s] samba4.smb.signing on with -k no --signing=required(ad_dc_ntvfs)
[623(3502)/843 at 47m11s] samba4.smb.signing on with -k no --option=clientusespnego=no --signing=on(ad_dc_ntvfs)
[624(3503)/843 at 47m12s] samba4.smb.signing on with -k no --option=clientusespnego=no --signing=required(ad_dc_ntvfs)
[625(3504)/843 at 47m12s] samba4.smb.signing on with -k no --option=gensec:spengo=no --signing=on(ad_dc_ntvfs)
[626(3505)/843 at 47m12s] samba4.smb.signing on with -k no --option=gensec:spengo=no --signing=required(ad_dc_ntvfs)
[627(3506)/843 at 47m12s] samba4.smb.signing on with -k yes --signing=on(ad_dc_ntvfs)
[628(3507)/843 at 47m12s] samba4.smb.signing on with -k yes --signing=required(ad_dc_ntvfs)
[629(3508)/843 at 47m13s] samba4.smb.signing on with -k yes --option=gensec:fake_gssapi_krb5=yes --option=gensec:gssapi_krb5=no --signing=on(ad_dc_ntvfs)
[630(3509)/843 at 47m13s] samba4.smb.signing on with -k yes --option=gensec:fake_gssapi_krb5=yes --option=gensec:gssapi_krb5=no --signing=required(ad_dc_ntvfs)
[631(3510)/843 at 47m13s] samba4.smb.signing disabled on with -k no --signing=off domain-creds(s4member)
[632(3511)/843 at 47m13s] samba4.smb.signing disabled on with -k no --option=clientusespnego=no --signing=off domain-creds(s4member)
[633(3512)/843 at 47m14s] samba4.smb.signing disabled on with -k no --option=gensec:spengo=no --signing=off domain-creds(s4member)
[634(3513)/843 at 47m14s] samba4.smb.signing disabled on with -k yes --signing=off domain-creds(s4member)
[635(3514)/843 at 47m14s] samba4.smb.signing on with -k no --signing=off local-creds(s4member)
[636(3515)/843 at 47m14s] samba4.smb.signing on with -k no --option=clientusespnego=no --signing=off local-creds(s4member)
[637(3516)/843 at 47m14s] samba4.smb.signing on with -k no --option=gensec:spengo=no --signing=off local-creds(s4member)
[638(3517)/843 at 47m14s] samba4.smb.signing --signing=yes anon(ad_dc_ntvfs)
[639(3518)/843 at 47m15s] samba4.smb.signing --signing=required anon(ad_dc_ntvfs)
[640(3519)/843 at 47m15s] samba4.smb.signing --signing=no anon(s4member)
[641(3520)/843 at 47m15s] samba4.winbind.struct(s4member:local)
Running WINBINDD_SHOW_SEQUENCE (struct based)
 * BUILTIN : 1
 * S4MEMBER : 1525799016
 * SAMBADOMAIN : 8773
UNEXPECTED(failure): samba4.winbind.struct.show_sequence(s4member:local)
REASON: Exception: Exception: ../source4/torture/winbind/struct_based.c:808: WINBINDD_SHOW_SEQUENCE returned 0, expected 1

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
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 226
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 202
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 136
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 127
samba4.raw.notify(ad_dc_ntvfs) -> 106
samba4.rpc.samlogon on ncacn_np with (ad_dc_ntvfs) -> 99
samba4.nbt.winsreplication(ad_dc_ntvfs) -> 60
samba4.ntvfs.cifs.krb5.base.deny2(ad_dc_ntvfs) -> 57
samba4.base.deny2(ad_dc_ntvfs) -> 57
samba4.ntvfs.cifs.krb5.base.deny1(ad_dc_ntvfs) -> 52
ERROR: test failed with exit code 1