Re: panic main-n252563-eb815a741940: Bad tailq NEXT(0xfffffe001d7a3ad8->tqh_last) != NULL

In reply to: David Wolfskill : "panic main-n252563-eb815a741940: Bad tailq NEXT(0xfffffe001d7a3ad8->tqh_last) != NULL"
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From: David Wolfskill <david_at_catwhisker.org>
Date: Fri, 21 Jan 2022 16:09:26 UTC

On Fri, Jan 21, 2022 at 04:32:56AM -0800, David Wolfskill wrote:
> This is for main-n252563-eb815a741940, after an update from yesterday's
> main-n252546-e0282802a6ec:
> 
> FreeBSD 14.0-CURRENT #401 main-n252546-e0282802a6ec: Thu Jan 20 04:15:42 PST 2022     root@g1-51.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  amd64 1400048 1400048
> 
> Screenshots (from each of 2 laptops) are in
> https://www.catwhisker.org/~david/FreeBSD/head/n252563/
> ... 
> I'm happy to provide more information, once I know what to provide.
> ....

Reverting 9ce46cbc95d7a6fccb55af0d42cbb85c29f10639, then rebuilding the
kernel, avoids the panic on the 2nd laptop.  (I'm using the first one,
as usual.)

Ref.
https://cgit.freebsd.org/src/commit/?id=9ce46cbc95d7a6fccb55af0d42cbb85c29f10639

Given that the laptops (which use ipfw) saw the panic and the build
machine (which does not) did not, there may be a relationship.

I'm happy to test possible fixes (on the 2nd laptop).

Peace,
david
-- 
David H. Wolfskill                              david@catwhisker.org
"We can either be loyal to Donald Trump or we can be loyal to the
Constitution, but we cannot be both." - Elizabeth ("Liz") Cheney

See https://www.catwhisker.org/~david/publickey.gpg for my public key.