Date: Sat, 6 May 2006 14:55:30 -0400 From: =?ISO-8859-1?Q?Lodewijk_V=F6ge?= <lvoege@gmail.com> To: freebsd-stable@freebsd.org Subject: dhclient taking up all CPU Message-ID: <82912730-AD0E-4AE0-AA7C-FDD321F00B57@gmail.com>
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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\021ؠ\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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