[Bug 195924] New: IXGBE watchdog bug causes crash.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195924

            Bug ID: 195924
           Summary: IXGBE watchdog bug causes crash.
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: liangyi571 at 163.com

When ixgbe driver reset hardware in timer function, it will crash sometime. In
ixgbe.c ixgbe_local_timer function. The code before goto watchdog segment:

    for (int i = 0; i < adapter->num_queues; i++, que++, txr++) {
        if ((txr->queue_status == IXGBE_QUEUE_HUNG) &&
            (paused == 0))
            ++hung;
        else if (txr->queue_status == IXGBE_QUEUE_WORKING)
            taskqueue_enqueue(que->tq, &txr->txq_task);
        }
    /* Only truely watchdog if all queues show hung */
        if (hung == adapter->num_queues)
                goto watchdog;

Before goto watchdog, pointer tar is out of bounds, so any access to pointer
txr will cause a buffer overflow problem. The bug exists in Release 9 and
Release 10. To fix this problem, I suggest reset txr in watchdog segment.

watchdog:
+    txr = adapter->tx_rings;

The same bug maybe exists in if_igb.c.

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