Date: Mon, 17 Sep 2018 11:17:04 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: freebsd-current@FreeBSD.org, "Bjoern A. Zeeb" <bz@FreeBSD.org>, karels@FreeBSD.org, Matt Macy <mmacy@FreeBSD.org>, rstone@freebsd.org Subject: Re: udp6: Page fault panics Message-ID: <ab9a81ec-320e-6446-375d-3a3df3adac6c@yandex.ru> In-Reply-To: <20180916000455.isqioezu6oovhjzg@ler-imac.local> References: <20180916000455.isqioezu6oovhjzg@ler-imac.local>
next in thread | previous in thread | raw e-mail | index | archive | help
This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --p3mMtZH4M5KQgdvfcSJzhob0ntgxYDaJ3 Content-Type: multipart/mixed; boundary="IPqMzjFczEhRHEmhJeYZ1EoyHUOziB9PK"; protected-headers="v1" From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: freebsd-current@FreeBSD.org, "Bjoern A. Zeeb" <bz@FreeBSD.org>, karels@FreeBSD.org, Matt Macy <mmacy@FreeBSD.org>, rstone@freebsd.org Message-ID: <ab9a81ec-320e-6446-375d-3a3df3adac6c@yandex.ru> Subject: Re: udp6: Page fault panics References: <20180916000455.isqioezu6oovhjzg@ler-imac.local> In-Reply-To: <20180916000455.isqioezu6oovhjzg@ler-imac.local> --IPqMzjFczEhRHEmhJeYZ1EoyHUOziB9PK Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 16.09.2018 03:04, Larry Rosenman wrote: > vpanic() at vpanic+0x1a3/frame 0xfffffe00ca17c150 > panic() at panic+0x43/frame 0xfffffe00ca17c1b0 > trap_fatal() at trap_fatal+0x35f/frame 0xfffffe00ca17c200 > trap_pfault() at trap_pfault+0x49/frame 0xfffffe00ca17c260 > trap() at trap+0x2ba/frame 0xfffffe00ca17c370 > calltrap() at calltrap+0x8/frame 0xfffffe00ca17c370 > --- trap 0xc, rip =3D 0xffffffff80631428, rsp =3D 0xfffffe00ca17c440, r= bp =3D 0xfffffe00ca17c480 --- > selectroute() at selectroute+0x198/frame 0xfffffe00ca17c480 > in6_selectroute_fib() at in6_selectroute_fib+0xf/frame 0xfffffe00ca17c4= a0 > ip6_output() at ip6_output+0xfd7/frame 0xfffffe00ca17c710 (kgdb) l *selectroute+0x198 0xffffffff80de14c8 is in selectroute (/home/devel/freebsd/base/head/sys/netinet6/in6_src.c:736). 731 * Use a cached route if it exists and is valid, else try to allocat= e 732 * a new one. Note that we should check the address family of the 733 * cached destination, in case of sharing the cache with IPv4. 734 */ 735 if (ro) { 736 if (ro->ro_rt && 737 (!(ro->ro_rt->rt_flags & RTF_UP) || 738 ((struct sockaddr *)(&ro->ro_dst))->sa_family !=3D AF_INET6 ||= 739 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, 740 dst))) { > calltrap() at calltrap+0x8/frame 0xfffffe00c9d863e0 > --- trap 0xc, rip =3D 0xffffffff80636b2b, rsp =3D 0xfffffe00c9d864b0, r= bp =3D 0xfffffe00c9d86710 --- > ip6_output() at ip6_output+0xeeb/frame 0xfffffe00c9d86710 > udp6_send() at udp6_send+0x720/frame 0xfffffe00c9d868d0 (kgdb) l *ip6_output+0xeeb 0xffffffff80de75bb is in ip6_output (/home/devel/freebsd/base/head/sys/netinet6/ip6_output.c:531). 526 */ 527 if (inp) { 528 ro->ro_dst.sin6_family =3D AF_INET6; 529 RT_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, fibnum); 530 } 531 if (ro->ro_rt && fwd_tag =3D=3D NULL && (ro->ro_rt->rt_flags & RTF_U= P) && 532 ro->ro_dst.sin6_family =3D=3D AF_INET6 && 533 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) { 534 rt =3D ro->ro_rt; 535 ifp =3D ro->ro_rt->rt_ifp; It looks like Ryan's assumption is correct and panics happen due to several threads use the same PCB and then route cache invalidation happen= s. https://lists.freebsd.org/pipermail/freebsd-net/2018-September/051563.htm= l But IPv6 path also needs similar patch. --=20 WBR, Andrey V. Elsukov --IPqMzjFczEhRHEmhJeYZ1EoyHUOziB9PK-- --p3mMtZH4M5KQgdvfcSJzhob0ntgxYDaJ3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAlufYwAACgkQAcXqBBDI oXqjqQf6A1DsifgYufCZ3bT3UAqCzqShY5ZxFYVtAiBZ694c7p5MfWvz4W1+QYfW CRFRTuBzsqNazwhJNIfMRuuz51Wg8qpYtGd0F9LepLQiKwpAbL+Z4jQ4xVwiS2n/ qPuTmXwdW6kaC5sN8yibCheKI8Lc/Sz3tmK6rk4TkKtrCVhkiC0QfiR/GCDaOuM0 Qh4FSGyBxsOU+G2MDHsbSxGveljqWjCK6gpcPB7wTh+iRpbP9JuZA4WHxHiKbk2y sjQuoHwzZie6c2zebPCcb48fQ8gxk83kdhCoJXP1a0Z85OjhIhJbQVdOdiW2RWNk rWAXrh96UBlYZbHS0bVtcM4JsMon1g== =hL6Z -----END PGP SIGNATURE----- --p3mMtZH4M5KQgdvfcSJzhob0ntgxYDaJ3--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?ab9a81ec-320e-6446-375d-3a3df3adac6c>