From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH,net-next,0/2] Improve code coverage of syzkaller
Date: Tue, 19 Sep 2017 23:08:53 -0700 (PDT)
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From: Petar Penkov <peterpenkov96@gmail.com>
Date: Tue, 19 Sep 2017 21:26:14 -0700

> Furthermore, in a way testing already requires specific kernel
> configuration.  In this particular example, syzkaller prefers
> synchronous operation and therefore needs 4KSTACKS disabled. Other
> features that require rebuilding are KASAN and dbx. From this point
> of view, I still think that having the TUN_NAPI flag has value.

Then I think this path could be enabled/disabled with a runtime flag
just as easily, no?