Re: "panic: fxp_start_body: attempted use of a free mbuf!" in RELENG_5

From: Kris Kennaway (kris_at_obsecurity.org)
Date: 10/08/04

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    Date: Thu, 7 Oct 2004 15:36:18 -0700
To: Brian Fundakowski Feldman <green@FreeBSD.org>

    On Thu, Oct 07, 2004 at 04:48:44PM -0400, Brian Fundakowski Feldman wrote:
    > On Thu, Oct 07, 2004 at 09:57:19AM -0700, Kris Kennaway wrote:
    > > Top of RELENG_5 on an smp machine:
    > >
    > > panic: fxp_start_body: attempted use of a free mbuf!
    > > cpuid = 1
    > > KDB: enter: panic
    > > [thread 100042]
    > > Stopped at kdb_enter+0x30: leave
    > > db> trace
    > > kdb_enter(c06de69a,1,c06d47c5,ebbd2b14,c34cd320) at kdb_enter+0x30
    > > panic(c06d47c5,c06c1030,4,c0499300,c3539000) at panic+0x14e
    > > fxp_start_body(c3539000,0,c06d5639,4ca,c3539000) at fxp_start_body+0x462
    > > fxp_start(c3539000,122,0,c3539000) at fxp_start+0x3f
    > > if_start(c3539000,0,c06e7822,179,ffff8002) at if_start+0x99
    > > ether_output_frame(c3539000,c38b5300,6,c4106b00,ebbd2bc8) at ether_output_frame+0x218
    > > ether_output(c3539000,c38b5300,c4106b00,c95ec210,c04fe48d) at ether_output+0x43e
    > > in_arpinput(c38b8700,122,c38b8700,c07656b8,c38b8700) at in_arpinput+0x686
    > > arpintr(c38b8700,0,c06e7c88,e5,c07656b8) at arpintr+0x104
    > > netisr_processqueue(c07656b8,c0738ac0,1,c06dda24,c3462940) at netisr_processqueue+0x8e
    > > swi_net(0,0,c06dc037,269,c0738ac0) at swi_net+0xe9
    > > ithread_loop(c345d880,ebbd2d48,c06dbe2a,323,d552d9c9) at ithread_loop+0x172
    > > fork_exit(c04f1210,c345d880,ebbd2d48) at fork_exit+0xc6
    > > fork_trampoline() at fork_trampoline+0x8
    > > --- trap 0x1, eip = 0, esp = 0xebbd2d7c, ebp = 0 ---
    >
    > Does this fix it?

    I don't yet know whether this problem is repeatable, so there's no
    point in testing the patch yet. If it keeps happening, I'll try your
    patch and see what it does so I can distinguish "fixed" from "null
    result".

    Kris

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