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SubjectRe: DHCP Problems with 3com 3c905C Tornado
Alan Cox wrote:
>
> > Obviously, something changed between 2.2.14 and more current
> > kernels which broke pump. I don't believe it's a driver change
> > because it also affects the 3c90x driver. I don't have a theory
> > as to why this affects the 3com NICs though. But I'm assuming
> > that whatever broke pump also broke dhcpcd.
>
> The classic thing that pump catches drivers with is that interface goes
> up/down/up in rapid succession. That broke the acenic driver at one point
> too

That's interesting.

The open() and probe() logic in the 2.2.18 driver is basically unchanged
since 2.2.14. And 3com's driver breaks with pump too. AFAIK it's
completely unchanged.

This makes one wonder what a successful return from open() actually
_means_. Autonegotiation takes up to three seconds, and we return from open()
with it still in progress. So the interface is not yet usable.

> > I note that with 3c59x in 2.4.0, pump-0.7.3 basically freezes up.
> > It spits out a single bootp packet then goes to lunch. I got
> > bored waiting after ten minutes. So an upgrade is definitely needed.
>
> strace would be interesting

It's very sick. It forks a daemon. The child process gets to
the stage where it has written out your new /etc/resolv.conf
and then it gets stuck making no system calls, chewing 100%
of CPU.

Yes, it ups and downs the interface a couple of times,
but everything seems happy. In fact, killing off the
bisbehaving pump leaves the interface in a working state,
so perhaps I have not in fact reproduced the problem. Hopefully
Christian can retest with a later pump and let me know.

1801 read(6, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 1748
1801 read(6, "", 4096) = 0
1801 close(6) = 0
1801 munmap(0x40014000, 4096) = 0
1801 open("/etc/ld.so.cache", O_RDONLY) = 6
1801 fstat(6, {st_mode=S_IFREG|0644, st_size=24405, ...}) = 0
1801 mmap(NULL, 24405, PROT_READ, MAP_PRIVATE, 6, 0) = 0x40014000
1801 close(6) = 0
1801 open("/lib/libnss_files.so.2", O_RDONLY) = 6
1801 fstat(6, {st_mode=S_IFREG|0755, st_size=292788, ...}) = 0
1801 read(6, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260\36"..., 4096) = 4096
1801 mmap(NULL, 37640, PROT_READ|PROT_EXEC, MAP_PRIVATE, 6, 0) = 0x40110000
1801 mprotect(0x40118000, 4872, PROT_NONE) = 0
1801 mmap(0x40118000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 6, 0x7000) = 0x40118000
1801 close(6) = 0
1801 munmap(0x40014000, 24405) = 0
1801 socket(PF_UNIX, SOCK_STREAM, 0) = 6
1801 connect(6, {sin_family=AF_UNIX, path="
/var/run/.nscd_socket"}, 110) = -1 ENOENT (No such file or directory)
1801 close(6) = 0
1801 open("/etc/host.conf", O_RDONLY) = 6
1801 fstat(6, {st_mode=S_IFREG|0644, st_size=26, ...}) = 0
1801 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40014000
1801 read(6, "order hosts,bind\nmulti on\n", 4096) = 26
1801 read(6, "", 4096) = 0
1801 close(6) = 0
1801 munmap(0x40014000, 4096) = 0
1801 open("/etc/hosts", O_RDONLY) = 6
1801 fcntl(6, F_GETFD) = 0
1801 fcntl(6, F_SETFD, FD_CLOEXEC) = 0
1801 fstat(6, {st_mode=S_IFREG|0644, st_size=314, ...}) = 0
1801 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40014000
1801 read(6, "10.0.0.15\t\tmnm.uow.edu.au mnm\n10"..., 4096) = 314
1801 read(6, "", 4096) = 0
1801 close(6) = 0
1801 munmap(0x40014000, 4096) = 0
1801 open("/etc/resolv.conf", O_RDONLY) = 6
1801 fstat(6, {st_mode=S_IFREG|0644, st_size=40, ...}) = 0
1801 read(6, "nameserver 61.8.0.5\nnameserver 6"..., 40) = 40
1801 close(6) = 0

*** End of output.
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