[Bug 225927] [panic] NULL pointer dereference in nd6_llinfo_timer()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225927

--- Comment #5 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
There is a generic problem in the LLE code (IPv4 and IPv6) that it cannot sleep
to drain the timers. In case an active timer is detected after callout_stop(),
then the LL entry should be put on a taskqueue and callout_drain() _must_ be
used for sane operation.

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