Date: Thu, 23 Feb 2006 23:28:44 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Sebastian Inacker <inacker@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Kernel panic within dummynet-code(?) Message-ID: <20060223212843.GC47860@ip.net.ua> In-Reply-To: <2829dda20602230207q574df45fs7a7a9daf7145ab4a@mail.gmail.com> References: <2829dda20602230207q574df45fs7a7a9daf7145ab4a@mail.gmail.com>
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On Thu, Feb 23, 2006 at 11:07:06AM +0100, Sebastian Inacker wrote:
> Hello Networkers.
>
> I got a kernel panic on FreeBSD 6.0-RELEASE, which is probably caused
> by a not initialised pointer "p = (void *) 0x0" within the
> dummynet-code.
>
> I analysed the crash dump and got
>
> (kgdb) f 9
> #9 0xc06d3670 in dummynet (unused=0x0) at ../../../netinet/ip_dummynet.c:785
>
> (kgdb) i loc
> p = (void *) 0x0
> h = (struct dn_heap *) 0x4
> heaps = {0xc093cf40, 0xc093cf60, 0xc093cf50}
> i = 22
> pe = (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=1000) 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.
>
There were several dummynet(4) fixes in RELENG_6, try with them
first. One that can be responsible for what you're seeing was
insufficient locking.
Cheers,
--
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer
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