[Bug 217751] Xenstore: there is a deadlock when suspending user-space processes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217751

            Bug ID: 217751
           Summary: Xenstore: there is a deadlock when suspending
                    user-space processes
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ouyangzhaowei at huawei.com

If there is a user process which maybe often reads and writes xenstore, the
application has been suspended after stop_all_proc is called. It held
xs.request_mutex lock but in the following functions xs_write and xs_suspend
will not get the lock. So the VM will hang.

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