Date: Tue, 21 Jul 2015 15:24:38 -0500 From: Eric van Gyzen <eric@vangyzen.net> To: David Wolfskill <david@catwhisker.org>, 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: <55AEAA86.1040107@vangyzen.net> 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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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --gNlTPBRc14NkRdkAStkUj0mBj7rtDjInQ Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 07/21/2015 15:21, Eric van Gyzen wrote: > On 07/21/2015 15:05, David Wolfskill wrote: >> On Tue, Jul 21, 2015 at 10:28:32PM +0300, Konstantin Belousov wrote: >>> ... >>> Indeed, thank you. >>> ithread_loop() at ithread_loop+0xa6/frame 0xfffffe083b9c0a70 >>> fork_exit() at fork_exit+0x84/frame 0xfffffe083b9c0ab0 >>> fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe083b9c0ab0 >>> --- trap 0, rip =3D 0, rsp =3D 0xfffffe083b9c0b70, rbp =3D 0 --- >>> suspending ithread with the following locks held: >>> shared rw udpinp (udpinp) r =3D 3 (0xfffff80010c7d7b0) locked @ /usr/= src/sys/netinet6/in6_pcb.c:1174 >>> panic: witness_warn >>> cpuid =3D 3 >>> >>> 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 (a= nd >> 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, = and >> r285740 in the range from (r285685,r285741] -- as the kernel running >> r285685 had no known issues -- that touched sys/netinet6/*. > It's a multicast destination. Maybe something is using mDNS? Blurf. "I wonder if" it's a multicast destination. (I need more chocola= te.) > Randall, does the test on line 406 of udp6_usrreq.c need to be inverted= ? > > Eric > --gNlTPBRc14NkRdkAStkUj0mBj7rtDjInQ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQF8BAEBCgBmBQJVrqqHXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQzRTcwNEY0QTBEMTM0MUU4QkNFNEQ3M0RB RkMxMkExM0VDMjBEQUI4AAoJEK/BKhPsINq4PjsIAKzFFgOBJmKodO42DEqgC2hV hKwbK8SqrNJqwTtRWiQUMpQ7X4w27Lnh5PnVNaHsI1JgKHnRMf6leXB+cSCVQUdC OhhCkXbwn5LbUAiHqRR8zftKEdlKdStAdzVAzJX7zaOAzcr3Ot5uQrKQyY3Ecgrd ec4au6J5mv9L/mfHhY3Vd3C1WM7FwHBYME2cz4KblCu8Smi2Cul1WjUdjGGiRjoT UYt2vlRmYZvOL2nI5znTsi54cfGP5b8T3HFrUAOnCPywwoZ7HxpWaEMbN1JznTe4 uQonFs2cjWh6oGdWxrp0S+SCdPYee8mlsWBT7fRW9KDPWEFnI80jwNOXdbo9xMs= =YbDv -----END PGP SIGNATURE----- --gNlTPBRc14NkRdkAStkUj0mBj7rtDjInQ--
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