Date: Wed, 15 May 2002 23:55:35 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Kris Kennaway <kris@obsecurity.org> Cc: Andrew Gallatin <gallatin@cs.duke.edu>, alpha@FreeBSD.org Subject: Re: memory management fault during netbooting on 4.6-PRERELEASE Message-ID: <XFMail.20020515235535.jhb@FreeBSD.org> In-Reply-To: <20020515204816.B302@xor.obsecurity.org>
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On 16-May-2002 Kris Kennaway wrote:
> On Wed, May 15, 2002 at 11:40:48PM -0400, John Baldwin wrote:
>
>> > (gdb) l *0xfffffc000056bcc0
>> > No source file for address 0xfffffc000056bcc0.
>>
>> Ok, can you do a nm kernel.debug | sort | less and find the two
>> symbols that that address falls between?
>
> fffffc000056bca0 t swi_net
> fffffc000056bd20 T do_sir
Ok, swi_net() looks like so (alpha/alpha/iplfuncs.c)
static void
swi_net()
{
u_int32_t bits = atomic_readandclear(&netisr);
int i;
for (i = 0; i < 32; i++) {
if (bits & 1)
netisrs[i]();
bits >>= 1;
}
}
My guess then is that we tried to execute a netisr() that was
NULL. Is this reproducible? If so, you could try adding a
a hack to not execute the isr if it's null, i.e.:
if ((bits & 1) != 0 && netisrs[i] != NULL)
netisrs[i]();
> Kris
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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