Question on taskqueue_drain

[Sepherosa Ziehau]

On Wed, Apr 19, 2017 at 10:39 AM, Somayajulu, David
<David.Somayajulu at cavium.com> wrote:
> Sorry what I meant to ask was, whether it is O.K to call taskqueue_drain(), when an MTX_DEF lock is grabbed prior to calling taskqueue_drain().
>

You will hit WITNESS, if the drain needs to wait; that's probably the
best case.  If the lock will be acquired in the task being drained,
this leads to deadlock.

Thanks,
sephe

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