Date: Mon, 26 Mar 2001 19:20:54 -0800 (PST) From: Archie Cobbs <archie@dellroad.org> To: Sleepless in Brisbane <snowy@snowy.org> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Kernel Panic on 4.3-RC #0 using PPPoE Message-ID: <200103270320.f2R3Ksu41321@arch20m.dellroad.org> In-Reply-To: <Pine.BSF.4.21.0103271217010.12238-400000@localhost> "from Sleepless in Brisbane at Mar 27, 2001 12:18:13 pm"
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Sleepless in Brisbane writes: > I am receiving kernel panics under 4.3-RC #0 when trying to bring up PPPoE. > A copy of the kernel debug, the start up and the actual PPP configuration are > attached. It appears to be something in the subroutine called fxp_start of > the actual ethernet card (Which is an Intel Express) trying to use a structure > which has not yet been initialized. The machine is an SMP machine as well; > although compiling without SMP support has so far made no difference. The > problem also occurs under 4.2-RELEASE. Any help on the subject would be > appreciated. I think that the interface has not yet been brought up (IFF_UP) before the first packet is sent out of it. This can normally only happen when using netgraph (or raw sockets I suppose)... the fxp driver seems to assume that it will never see an output packet without an IFF_UP first, which is no longer true. Also, ppp(8) should be setting IFF_UP on the interface before trying to send out of it. Not sure why this hasn't been detected before though. Below is a possible patch. -Archie __________________________________________________________________________ Archie Cobbs * Packet Design * http://www.packetdesign.com Index: if_fxp.c =================================================================== RCS file: /home/cvs/freebsd/src/sys/pci/if_fxp.c,v retrieving revision 1.77.2.9 diff -u -r1.77.2.9 if_fxp.c --- if_fxp.c 2000/10/24 21:47:36 1.77.2.9 +++ if_fxp.c 2001/03/27 03:20:12 @@ -1053,6 +1053,12 @@ struct fxp_cb_tx *txp; /* + * Don't send anything unless initialized. + */ + if ((ifp->if_flags & IFF_UP) == 0) + return; + + /* * See if we need to suspend xmit until the multicast filter * has been reprogrammed (which can only be done at the head * of the command chain). To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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