Date: Wed, 15 May 2002 21:00:01 -0700 From: Kris Kennaway <kris@obsecurity.org> To: John Baldwin <jhb@FreeBSD.org> Cc: Kris Kennaway <kris@obsecurity.org>, Andrew Gallatin <gallatin@cs.duke.edu>, alpha@FreeBSD.org Subject: Re: memory management fault during netbooting on 4.6-PRERELEASE Message-ID: <20020515210001.A742@xor.obsecurity.org> In-Reply-To: <XFMail.20020515235535.jhb@FreeBSD.org>; from jhb@FreeBSD.org on Wed, May 15, 2002 at 11:55:35PM -0400 References: <20020515204816.B302@xor.obsecurity.org> <XFMail.20020515235535.jhb@FreeBSD.org>
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--k1lZvvs/B4yU6o8G Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, May 15, 2002 at 11:55:35PM -0400, John Baldwin wrote: >=20 > On 16-May-2002 Kris Kennaway wrote: > > On Wed, May 15, 2002 at 11:40:48PM -0400, John Baldwin wrote: > >=20 > >> > (gdb) l *0xfffffc000056bcc0 > >> > No source file for address 0xfffffc000056bcc0. > >>=20 > >> Ok, can you do a nm kernel.debug | sort | less and find the two > >> symbols that that address falls between? > >=20 > > fffffc000056bca0 t swi_net > > fffffc000056bd20 T do_sir >=20 > Ok, swi_net() looks like so (alpha/alpha/iplfuncs.c) >=20 > static void > swi_net() > { > u_int32_t bits =3D atomic_readandclear(&netisr); > int i; >=20 > for (i =3D 0; i < 32; i++) { > if (bits & 1) > netisrs[i](); > bits >>=3D 1; > } > } >=20 > My guess then is that we tried to execute a netisr() that was > NULL. Is this reproducible? Yes, it seems to be. > If so, you could try adding a > a hack to not execute the isr if it's null, i.e.: >=20 > if ((bits & 1) !=3D 0 && netisrs[i] !=3D NULL) > netisrs[i](); Will try once the current alpha package build is finished. Are there any other diagnostics I can add while I'm in there? Kris --k1lZvvs/B4yU6o8G Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (FreeBSD) iD8DBQE84y7BWry0BWjoQKURArraAKDudZzoFUh9ULGYvbi33SV6dQaYzwCfb8cb 43Ge6PAQMvEe/JxuaFhKLm4= =TpvJ -----END PGP SIGNATURE----- --k1lZvvs/B4yU6o8G-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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