deadlock in example vdpa app

https://bugs.dpdk.org/show_bug.cgi?id=611

            Bug ID: 611
           Summary: deadlock in example vdpa app
           Product: DPDK
           Version: 20.08
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: examples
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

Recently we see a deadlock in vdpa example app if SIGTERM signal is sent at early start stage.After debuging, we suspect it's due to vhost_user.mutex is requested twice,once by start sequence start_vdpa(), the other by SIGTERM signal handler which calling close_vdpa().

Also checked other example apps, seems they all have same issue.

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