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Date: Thu, 23 Feb 2006 11:07:06 +0100
From: "Sebastian Inacker" <inacker@gmail.com>
To: freebsd-net@freebsd.org
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Subject: Kernel panic within dummynet-code(?)
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Hello Networkers.

I got a kernel panic on FreeBSD 6.0-RELEASE, which is probably caused
by a not initialised pointer "p =3D (void *) 0x0" within the
dummynet-code.

I analysed the crash dump and got

  (kgdb) f 9
  #9  0xc06d3670 in dummynet (unused=3D0x0) at ../../../netinet/ip_dummynet=
.c:785

  (kgdb) i loc
  p =3D (void *) 0x0
  h =3D (struct dn_heap *) 0x4
  heaps =3D {0xc093cf40, 0xc093cf60, 0xc093cf50}
  i =3D 22
  pe =3D (struct dn_pipe *) 0x4

(see backtrack[1] of the crash dump).

Some frames before I do have problems with subr_turnstile.c and
kern_mutex.c, which could be caused by a problem in dummynet - but I'm
not sure.

The machine does use dummynet (with DUMMYNET and HZ=3D1000) for
bandwidth management, but the problem - if it is within dummynet -
have to be a special case, because it crashes not as regulary as it
would do in other cases.

I'd be glad, if someone can help me.
I would be glad also if I could help to fix a maybe existing bug.

[1] To save bandwidth: The complete backtrack of that kernel panic is on
<URL:http://www.inacker.de/data/freebsd-kgdb-debug4.txt>, if that's
helpfull. Just ask for more informations if needed.