We are having the same issue today, with samba 4.3.9 on ubuntu 14.04. We started having this issue on wednesday night.
Linux helisrv 3.16.0-70-generic #90~14.04.1-Ubuntu SMP Wed Apr 6 22:56:34 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux (if I can add more information, let me know, not so used to launchpad yet) ** Attachment added: "syslog messages" https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1572608/+attachment/4657132/+files/smbd_bug -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1572608 Title: Samba 2:4.3.8+dfsg-0ubuntu0.14.04.2 Reversion: CPU Soft Lock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1572608/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs