[Bug 226357] FreeBSD 11.1 hangs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226357

            Bug ID: 226357
           Summary: FreeBSD 11.1 hangs
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: michronne at yahoo.com

I using 11.1-RELEASE + ZFS. Every few days FreeBSD hangs, means does no more
respond (also no ssh connection but there is a ping). At the console you can
type in the user name and after pressing enter shows the new empty lines (no
password asked, no answer). No error message on the screen on
/var/log/messages. Sometimes it returns to action after a few / several
minutes. Shutdown the system resolve the problem for the next few days. The
problem is repeated on many servers with the same configuration. There was no
problem on version 10.3
Any ideas?

ctrl+t:
load:  1.56  cmd:  getty 2660 [ vmmaps] 7074936.52r 0.00u 0.00s 0% 1008k
load:  1.70  cmd:  getty 2660 [ vmmaps] 7074994.31r 0.00u 0.00s 0% 992k
load:  1.70  cmd:  getty 2660 [ vmmaps] 7074996.12r 0.00u 0.00s 0% 992k
load:  1.70  cmd:  getty 2660 [ vmmaps] 7074997.24r 0.00u 0.00s 0% 992k
load:  1.64  cmd:  getty 2660 [ vmmaps] 7075073.03r 0.00u 0.00s 0% 968k
load:  1.60  cmd:  getty 2660 [ vmmaps] 7075142.04r 0.00u 0.00s 0% 964k

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