[Bug 293548] kernel panic with tun interfaces

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293548

Zhenlei Huang <[email protected]> changed:

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--- Comment #9 from Zhenlei Huang <[email protected]> ---
Created attachment 268562
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268562&action=edit
Check ifnet's flag first

(In reply to Kyle Evans from comment #8)

> On the other hand, thinking about it: we only destroy the mutex after doing an
> if_detach + if_free, but is it the case (CC glebius@) that the ifnet isn't fully
> detached until an epoch elapses, so we very well could have some packets lingering
> and should defer-reclaim those last bits?

I see one problem with the driver. For the outbound traffic, the path is `net
stack` -> `drivers`. Then the ifnet's flag `if_flags` should be checked
firstly, and then the driver's one.

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