Issue

Winbind process jumps to 100% CPU usage.
Unable to query or authenticate users to the domain.
The only way we can restart Winbind and re-establish connection to the domain is killing winbind processes with a SIGKILL.
Customer experienced some network issues in their network just before they started noticing this issue.

errors seen in samba logs :

Dec  6 00:11:58 xxx winbindd[28119]:   Got invalid trustdom response
Dec  6 00:12:58 xxx winbindd[27547]: [2012/12/06 00:12:58.284851,  0] winbindd/winbindd_util.c:325(trustdom_recv)
Dec  6 00:12:58 xxx winbindd[27547]:   Got invalid trustdom response
Dec  6 00:12:59 xxx winbindd[28512]: [2012/12/06 00:12:59.214147,  0] winbindd/winbindd_util.c:325(trustdom_recv)
Dec  6 00:12:59 xxx winbindd[28512]:   Got invalid trustdom response