[Bug 233535] Fix refcount leak in IPv6 MLD code leading to loss of IPv6 connectivity

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233535

Hans Petter Selasky <hselasky at FreeBSD.org> changed:

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--- Comment #38 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
Created attachment 201210
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201210&action=edit
Fix MLD refcounting in IPv6 code (including additional debugging).

@ae:

I found more issues:

1) Missing EPOCH enter/exit calls around CK_STAILQ's
2) Some disconnect MDL calls where previously only a negative ref (See
@mmacys's commits) and I believe this should only be negative refs.

Can you test new patch?

And also provide "dmesg" if it doesn't panic and output from "vmstat -m | grep
multi".

Thank you!

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