dhclient taking up all CPU

[Brooks Davis]

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 at 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 == 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 += hdr.bh_hdrlen;
> >(gdb)
> >327                     if (hdr.bh_caplen != hdr.bh_datalen) {
> >(gdb)
> >328                             interface->rbuf_offset =
> >(gdb)
> >331                             continue;
> >(gdb)
> >385             } while (!length);
> >
> >and then it goes back to line 285. interesting variables are:
> >
> >(gdb) p *interface
> >$1 = {next = 0x0, hw_address = {htype = 1 '\001', hlen = 6 '\006',
> >    haddr = "\000\021??\223?\000\000\000\000\000\000\000\000\000"},
> >primary_address = {s_addr = 0},
> >  name = "vr0", '\0' <repeats 12 times>, rfdesc = 7, wfdesc = 7,
> >rbuf = 0x807d000 "\022?\\Dk\214", rbuf_max = 4096,
> >  rbuf_offset = 416, rbuf_len = 415, ifp = 0x806f160, client =
> >0x8075000, noifmedia = 0, errors = 0, dead = 0, index = 2}
> >(gdb) p length
> >$2 = 0
> >(gdb) p hdr
> >$3 = {bh_tstamp = {tv_sec = 0, tv_usec = 0}, bh_caplen = 4294901760,
> >bh_datalen = 4294901778, bh_hdrlen = 65535}
> >
> >this is FreeBSD/i386 6.1-RC as of about two weeks ago.
> >
> >Lodewijk
> >
> >_______________________________________________
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> >http://lists.freebsd.org/mailman/listinfo/freebsd-stable
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> >

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