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Date:      Fri, 29 May 2015 02:35:58 +0300
From:      "Andrey V. Elsukov" <ae@FreeBSD.org>
To:        Julian Kornberger <juliank@tzi.de>,  "net@freebsd.org" <net@FreeBSD.org>
Subject:   Re: Crash with GRE und IPFW fwd
Message-ID:  <5567A65E.1040505@FreeBSD.org>
In-Reply-To: <5567248B.1040207@tzi.de>
References:  <5566565A.7030200@tzi.de> <55671F25.5070308@FreeBSD.org> <5567248B.1040207@tzi.de>

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On 28.05.2015 17:22, Julian Kornberger wrote:
> Am 28.05.2015 um 15:59 schrieb Andrey V. Elsukov:> Can you enable
> dumpon(8) in your rc.conf, then get the crash dump and
>> show content of your /var/crash/core.txt.N file?
>>
>> Also can you try this module instead of one from your base system?
>> https://people.freebsd.org/~ae/gre-10.tgz
>>
>> This is ported to stable/10 version from 11.0-CURRENT.
>>
>=20
> I already have some crash logs:
> http://91.202.42.216/
>=20
> Some are with and some are without dummynet.

The actual panic occurs when ip_output() does RO_RTFREE() to cached
route owned by gre(4).

#7  0xffffffff80a58105 in ip_output (m=3D0xfffff800054bb000,
    opt=3D<value optimized out>, flags=3D<value optimized out>,
    imo=3D<value optimized out>, inp=3D0x0)
    at /usr/src/sys/netinet/ip_output.c:218
#8  0xffffffff81a15797 in gre_output (ifp=3D0xfffff80005a33000,
    m=3D<value optimized out>, dst=3D<value optimized out>,
    ro=3D<value optimized out>)
    at /usr/src/sys/modules/if_gre/../../net/if_gre.c:509

As I see you have two gre(4) tunnels:

gre1: inet 10.9.0.9 --> 10.9.0.8
gre2: inet 10.9.0.11 --> 10.9.0.10

but which addresses do you use as tunnel endpoints?

--=20
WBR, Andrey V. Elsukov


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