Date: Mon, 6 Nov 2006 08:34:27 -0600 From: Brooks Davis <brooks@one-eyed-alien.net> To: spil.oss@gmail.com Cc: freebsd-stable@freebsd.org Subject: Re: dhclient taking up all CPU Message-ID: <20061106143427.GA34760@lor.one-eyed-alien.net> In-Reply-To: <5fbf03c20611060520s473b54d1v8577cac647078fee@mail.gmail.com> References: <82912730-AD0E-4AE0-AA7C-FDD321F00B57@gmail.com> <5fbf03c20611051212q28a819cbhf7e49d56c4ff6b3e@mail.gmail.com> <20061105203834.GA22060@lor.one-eyed-alien.net> <5fbf03c20611060520s473b54d1v8577cac647078fee@mail.gmail.com>
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It doesn't effect nearly enough people to warrent a commit to the eratta
branch. It's also not serious enough; the bar has typically been set at
the level of data corruption bugs.
-- Brooks
On Mon, Nov 06, 2006 at 02:20:42PM +0100, Spil Oss wrote:
> Hi all,
>=20
> Rebuilt dhclient with the bpf.c from RELENG_6 ( line 285 =3D=3D -> >=3D)
> According to the cvs commit log this fixes my problem.
>=20
> Still leaves me wondering why this was not applied to RELENG_6_1
>=20
> Kind regards,
>=20
> Spil.
>=20
>=20
> On 05/11/06, Brooks Davis <brooks@one-eyed-alien.net> wrote:
> >It should be fixed in STABLE. The particular fixes were to bpf.c so I
> >belive (but have not verified) that if you grab the latest version of
> >that file, put it in src/sbin/dhclient/ and rebuild dhclient the
> >problems will go away.
> >
> >-- Brooks
> >
> >On Sun, Nov 05, 2006 at 09:12:25PM +0100, Spil Oss wrote:
> >> Hi all,
> >>
> >> Been experiencing this same behaviour every now-and-then.
> >>
> >> FreeBSD/i386 6.1-RELEASE-p10
> >>
> >> Any solutions to this?
> >>
> >> Kind regards,
> >>
> >> Spil.
> >>
> >> On 06/05/06, Lodewijk V??ge <lvoege@gmail.com> wrote:
> >> >hello,
> >> >
> >> >a while ago someone reported the same problem I had been seeing, that
> >> >dhclient starts taking up 100% CPU. it's probably something comcast
> >> >is doing.
> >> >
> >> >I couldn't get the requested coredump then, if I set kern.corefile
> >> >to /tmp/%N.core and kill -QUIT it, it doesn't seem to produce a
> >> >coredump. but it happened again just now, and I was able to attach
> >> >gdb. this is where it's spinning, in receive_packet() in bpf.c:
> >> >
> >> >(gdb)
> >> >285 if (interface->rbuf_offset =3D=3D interface-
> >> > >rbuf_len) {
> >> >(gdb)
> >> >299 if (interface->rbuf_len - interface-
> >> > >rbuf_offset <
> >> >(gdb)
> >> >306 memcpy(&hdr, &interface->rbuf[interface-
> >> > >rbuf_offset],
> >> >(gdb)
> >> >313 if (interface->rbuf_offset + hdr.bh_hdrlen +
> >> >hdr.bh_caplen >
> >> >(gdb)
> >> >320 interface->rbuf_offset +=3D hdr.bh_hdrlen;
> >> >(gdb)
> >> >327 if (hdr.bh_caplen !=3D hdr.bh_datalen) {
> >> >(gdb)
> >> >328 interface->rbuf_offset =3D
> >> >(gdb)
> >> >331 continue;
> >> >(gdb)
> >> >385 } while (!length);
> >> >
> >> >and then it goes back to line 285. interesting variables are:
> >> >
> >> >(gdb) p *interface
> >> >$1 =3D {next =3D 0x0, hw_address =3D {htype =3D 1 '\001', hlen =3D 6 =
'\006',
> >> > haddr =3D "\000\021??\223?\000\000\000\000\000\000\000\000\000"},
> >> >primary_address =3D {s_addr =3D 0},
> >> > name =3D "vr0", '\0' <repeats 12 times>, rfdesc =3D 7, wfdesc =3D 7,
> >> >rbuf =3D 0x807d000 "\022?\\Dk\214", rbuf_max =3D 4096,
> >> > rbuf_offset =3D 416, rbuf_len =3D 415, ifp =3D 0x806f160, client =3D
> >> >0x8075000, noifmedia =3D 0, errors =3D 0, dead =3D 0, index =3D 2}
> >> >(gdb) p length
> >> >$2 =3D 0
> >> >(gdb) p hdr
> >> >$3 =3D {bh_tstamp =3D {tv_sec =3D 0, tv_usec =3D 0}, bh_caplen =3D 42=
94901760,
> >> >bh_datalen =3D 4294901778, bh_hdrlen =3D 65535}
> >> >
> >> >this is FreeBSD/i386 6.1-RC as of about two weeks ago.
> >> >
> >> >Lodewijk
> >> >
> >> >_______________________________________________
> >> >freebsd-stable@freebsd.org mailing list
> >> >http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> >> >To unsubscribe, send any mail to=20
> >"freebsd-stable-unsubscribe@freebsd.org"
> >> >
> >
> >> _______________________________________________
> >> freebsd-stable@freebsd.org mailing list
> >> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> >> To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.o=
rg"
> >
> >
> >
> >
>=20
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