Possible deadlock in testpmd

https://bugs.dpdk.org/show_bug.cgi?id=628

            Bug ID: 628
           Summary: Possible deadlock in testpmd
           Product: DPDK
           Version: 20.08
          Hardware: x86
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: High
         Component: testpmd
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
        Depends on: 611

Target Milestone: ---

+++ This bug was initially created as a clone of Bug #611 +++

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.

+++

Testpmd seems also impacted. Indeed, pmd_test_exit() gets called, which turns out to call dev_stop() and dev_close() ethdev ops that almost all take spinlock or mutexes.

Referenced Bugs:

https://bugs.dpdk.org/show_bug.cgi?id=611
[Bug 611] deadlock in example vdpa app

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