[Bug 217740] netfront: cannot release all resources after adding and removing NICs time and again

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217740

            Bug ID: 217740
           Summary: netfront: cannot release all resources after adding
                    and removing NICs time and again
           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

On xen,freebsd 10.3 virtual machines hang after adding and removing NICs time 
and again(more than 30 times).
I found error log is as follows:
"netfront can't alloc tx grant refs"

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