Timur Tabi wrote:

The hang occurs with this loop in napi_disable():

     while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
         msleep(1);

This loop never exits.  Can you give me a clue as to what could be the
reason?

I figured it out. I cannot call napi_disable() twice in a row. It's not smart enough to know that NAPI is already disabled.

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