Date: Wed, 1 Nov 2006 12:54:29 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Ulrich Spoerlein <uspoerlein@gmail.com> Cc: stable@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: panic: vfs_getopt: caller passed 'opts' as NULL Message-ID: <20061101175428.GA33982@xor.obsecurity.org> In-Reply-To: <7ad7ddd90611010257o75546455p7da194b17037f8ed@mail.gmail.com> References: <7ad7ddd90610300741k5789f64j8f410b6e866b99ee@mail.gmail.com> <20061030224935.GA95120@xor.obsecurity.org> <7ad7ddd90610302348j6b7aabc7vc0a89e1e95d8fd27@mail.gmail.com> <20061031184150.GA27161@xor.obsecurity.org> <7ad7ddd90611010257o75546455p7da194b17037f8ed@mail.gmail.com>
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--MGYHOYXEY6WxJCY8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Nov 01, 2006 at 11:57:48AM +0100, Ulrich Spoerlein wrote: > I grepped /sys for DEBUG_VFS_LOCKS and it seems to only add some > additional KASSERTs, but not the one which triggered in the original > panic. >=20 > Nullfs seems more fragile than I initially thought ... It's just that compiling in the extra debugging (it might be DEBUG_LOCKS or DEBUG_VFS_LOCKS, I forget which), causes the sizes of structures to change, so when the module tries to fondle the structure at a certain offset thinking it's accessing a certain field, it's really fondling something else entirely and the kernel gets a nasty surprise and panics. Kris --MGYHOYXEY6WxJCY8 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFSN9UWry0BWjoQKURAl1SAJ42FFZxnRWt2KWslxhx5pqHPgJDkQCgl5+1 gL3WjSLW89Y4JgSDtzMiOlk= =MyOG -----END PGP SIGNATURE----- --MGYHOYXEY6WxJCY8--
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