[Samba] Winbindd (tdb_chainlock_with_timeout_internal: alarm (40) timed out for key)

[Carlos]

Hi!

I have 3 server:

S.O. -  Debina 8

Winbind Version : 2:4.2.10+dfsg-0+deb8u3

Member Domain

Samba Server : Ubuntu 14.04 with Samba 4.7.7 , are 18 Dcs

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In day 21/05 , the 3 server have same problema in same time, th problem 
resolved after 40 minutes....

Syslog server 1/2/3:

May 21 08:14:12  winbindd[6718]: [2018/05/21 08:14:12.288624,  0] 
../source3/winbindd/winbindd_dual.c:105(child_write_response)
May 21 08:14:12  winbindd[6718]:   Could not write result
May 21 08:15:01  CRON[32667]: (root) CMD (command -v debian-sa1 > 
/dev/null && debian-sa1 1 1)

May 21 08:15:26  winbindd[28719]: [2018/05/21 08:15:26.341870,  0] 
../source3/winbindd/winbindd_dual.c:105(child_write_response)
May 21 08:15:26  winbindd[28719]:   Could not write result
May 21 08:15:30  winbindd[28808]: [2018/05/21 08:15:30.814572,  0] 
../source3/winbindd/winbindd_dual.c:105(child_write_response)
May 21 08:15:30  winbindd[28808]:   Could not write result
May 21 08:15:45  winbindd[32708]: [2018/05/21 08:15:45.545910,  0] 
../source3/lib/util_tdb.c:493(tdb_chainlock_with_timeout_internal)
May 21 08:15:45  winbindd[32708]: tdb_chainlock_with_timeout_internal: 
alarm (40) timed out for key DCXXX in tdb /var/run/samba/mutex.tdb
May 21 08:15:45  winbindd[32708]: [2018/05/21 08:15:45.546208,  0] 
../source3/winbindd/winbindd_cm.c:918(cm_prepare_connection)
May 21 08:15:45  winbindd[32708]:   cm_prepare_connection: mutex grab 
failed for DCXXXX

May 21 08:16:47  winbindd[29020]: [2018/05/21 08:16:47.246684,  0] 
../source3/lib/util_tdb.c:493(tdb_chainlock_with_timeout_internal)
May 21 08:16:47  winbindd[29020]: tdb_chainlock_with_timeout_internal: 
alarm (40) timed out for key DCYYY in tdb /var/run/samba/mutex.tdb
May 21 08:16:47  winbindd[29020]: [2018/05/21 08:16:47.246803,  0] 
../source3/winbindd/winbindd_cm.c:918(cm_prepare_connection)
May 21 08:16:47  winbindd[29020]:   cm_prepare_connection: mutex grab 
failed for DCYYYY
May 21 08:16:54  winbindd[29077]: [2018/05/21 08:16:54.834268,  0] 
../source3/lib/util_tdb.c:493(tdb_chainlock_with_timeout_internal)
May 21 08:16:54  winbindd[29077]: tdb_chainlock_with_timeout_internal: 
alarm (40) timed out for key DCXXXX in tdb /var/run/samba/mutex.tdb
May 21 08:16:54  winbindd[29077]: [2018/05/21 08:16:54.834410,  0] 
../source3/winbindd/winbindd_cm.c:918(cm_prepare_connection)
May 21 08:16:54  winbindd[29077]:   cm_prepare_connection: mutex grab 
failed for DCYYYY

May 21 08:17:01  CRON[1667]: (root) CMD (   cd / && run-parts --report 
/etc/cron.hourly)
May 21 08:17:16  ldminfod[29951]: connect from 192.168.2.157 (192.168.2.157)
May 21 08:17:41  winbindd[29077]: [2018/05/21 08:17:41.330909,  0] 
../source3/lib/util_tdb.c:493(tdb_chainlock_with_timeout_internal)

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Ant Idea ?

Regards