[Bug 294984] Kernel panic in udp6_send when underlying interface disappears

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294984

--- Comment #5 from Zhenlei Huang <[email protected]> ---
(In reply to Bjoern A. Zeeb from comment #4)
> What's the reason the change doesn't get merged to stable/15? 

There're other changes to ifnet. I think maybe it is good time to MFC now ( so
we have plenty time to test before next 15.x release ) ?

CC Gleb.

> Given it's an extension to the struct it looks like it is totally fine.
>  Given we allocate within the kernel (and only use the field inside the kernel) it 
> seems fine even if 3rd party kernel modules would exist which use this.

I think the work on IfAPI has finished in CURRENT and stable/15.  I have also
MFCed some commits related to IfAPI to stable/14. 3rd party drivers are
encouraged to use IfApi but not to talk to ifnet structure. Anyway the changes
to ifnet is significant and maybe Gleb do not want to make developers unhappy
;)

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