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Date: Wed, 31 Mar 2004 11:52:13 -0800
From: Andrew Morton <akpm@osdl.org>
To: "Craig, Dave" <dwcraig@qualcomm.com>
Cc: list@noduck.net, linux-kernel@vger.kernel.org
Subject: Re: kernel BUG at kernel/timer.c:370!
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"Craig, Dave" <dwcraig@qualcomm.com> wrote:
>
> cascade: c1a1d5e0 != c1a0d5e0
>  hander=c028ee8d (igmp_ifc_timer_expire+0x0/0x3e)
>  Call Trace:
>   [<c012ca73>] cascade+0x79/0xa1
>   [<c028ee8d>] igmp_ifc_timer_expire+0x0/0x3e
>   [<c012d0b3>] run_timer_softirq+0x159/0x1c9
>   [<c012899d>] do_softirq+0xc9/0xcb
>   [<c0119c46>] smp_apic_timer_interrupt+0xd8/0x140
>   [<c0108c09>] default_idle+0x0/0x32
>   [<c010bab2>] apic_timer_interrupt+0x1a/0x20
>   [<c0108c09>] default_idle+0x0/0x32
>   [<c0108c36>] default_idle+0x2d/0x32
>   [<c0108cb4>] cpu_idle+0x3a/0x43
>   [<c0105000>] rest_init+0x0/0x68
>   [<c039c89f>] start_kernel+0x1b7/0x209
>   [<c039c427>] unknown_bootoption+0x0/0x124
> 
>  Here is the result.  I am doing a lot of IPv4 multicast.

There's only a single bit difference between the expected and actual
timer->base value.  So either your machine has flakey memory or the percpu
data area happened to be separated by 64k.

Is the machine SMP?  If so can you please run

	nm vmliunx | grep __per_cpu

and send the output?
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