Date: Tue, 21 Jul 2015 14:59:07 -0700 From: David Wolfskill <david@catwhisker.org> To: Eric van Gyzen <eric@vangyzen.net> Cc: Konstantin Belousov <kostikbel@gmail.com>, current@freebsd.org, net@freebsd.org, Randall Stewart <rrs@freebsd.org> Subject: Re: panic: witness_warn head/amd64 @r285741 on 1 of 2 machines Message-ID: <20150721215907.GM27865@albert.catwhisker.org> In-Reply-To: <55AEA9BC.5070806@vangyzen.net> References: <20150721125734.GF1217@albert.catwhisker.org> <20150721133907.GR2404@kib.kiev.ua> <20150721161927.GN1217@albert.catwhisker.org> <20150721191743.GA39506@muskytusk> <20150721192832.GB2404@kib.kiev.ua> <20150721200515.GD27865@albert.catwhisker.org> <55AEA9BC.5070806@vangyzen.net>
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On Tue, Jul 21, 2015 at 03:21:16PM -0500, Eric van Gyzen wrote:
> ...
> >> So it looks like net swi, leaking some udp6 lock.
> > Curiouser and curiouser... While I'm not taking any special pains to
> > avoid building IPv6, I'm not actively actually doing anything with it
> > (IPv6), either (for both the failing machine and my laptop).
> >
> > Once I'm back home, I should be able to poke around in ddb after
> > re-creating the panic, if that would be a useful thing for me to do (and
> > given some hints as to what to poke).
> >
> > Naturally, I'm also happy to change bits of sources, rebuild, and
> > smoke-test.
> >
> > A quick check from the SVN update output only shows r285710, r285711, a=
nd
> > r285740 in the range from (r285685,r285741] -- as the kernel running
> > r285685 had no known issues -- that touched sys/netinet6/*.
>=20
> It's a multicast destination. Maybe something is using mDNS?
>=20
> Randall, does the test on line 406 of udp6_usrreq.c need to be inverted?
>=20
> Eric
>=20
<DING!> We have a winner!
FreeBSD freebeast.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #1789 r=
285741M/285741:1100077: Tue Jul 21 14:50:59 PDT 2015 root@freebeast.cat=
whisker.org:/common/S3/obj/usr/src/sys/GENERIC amd64
freebeast(11.0-C)[3] cd /usr/src
freebeast(11.0-C)[4] svn diff sys/netinet
netinet/ netinet6/=20
freebeast(11.0-C)[4] svn diff sys/netinet*
Index: sys/netinet6/udp6_usrreq.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- sys/netinet6/udp6_usrreq.c (revision 285741)
+++ sys/netinet6/udp6_usrreq.c (working copy)
@@ -403,7 +403,7 @@
INP_RLOCK(last);
INP_INFO_RUNLOCK(pcbinfo);
UDP_PROBE(receive, NULL, last, ip6, last, uh);
- if (udp6_append(last, m, off, &fromsa))=20
+ if (! udp6_append(last, m, off, &fromsa))=20
INP_RUNLOCK(last);
inp_lost:
return (IPPROTO_DONE);
freebeast(11.0-C)[5]=20
Thanks! :-)
Peace,
david
--=20
David H. Wolfskill david@catwhisker.org
Those who murder in the name of God or prophet are blasphemous cowards.
See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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