From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4C6BE610.7020507@domain.hid> Date: Wed, 18 Aug 2010 15:54:24 +0200 From: Stefan Kisdaroczi MIME-Version: 1.0 References: <4C45539B.70204@domain.hid> <4C6932E8.7050701@domain.hid> <4C694AB3.8050407@domain.hid> <4C698E16.5050806@domain.hid> <1282040830.1730.232.camel@domain.hid> <4C6ACA50.3080108@domain.hid> <1282120049.1730.304.camel@domain.hid> <4C6BCDE5.6050607@domain.hid> In-Reply-To: <4C6BCDE5.6050607@domain.hid> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigE17A7E88FF45609495129D9D" Subject: Re: [Xenomai-help] kernel 2.6.32.11 with xenomai 2.5.3 fails to boot on ubuntu lucid system List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: xenomai@xenomai.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigE17A7E88FF45609495129D9D Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 18.08.2010 14:11, Stefan Kisdaroczi wrote: > [...] > hi philippe, hope this helps: > > > (gdb) bt > #0 doublefault_fn () at arch/x86/kernel/doublefault_32.c:47 > #1 0x00000000 in ?? () > > I set two breakpoints: > 1) do_test_wp_bit() > 2) zap_low_mappings() > > The second breakpoint is never reached, the fault seems to happen in > do_test_wp_bit(). > arch/x86/mm/init_32.c : mem_init() -> test_wp_bit() -> do_test_wp_bit()= > =20 If I got it right, do_test_wp_bit() should fault, and then ipipe_handle_exception gets called. At this point, ipipe_init_early() was called, but ipipe_init() not. So, I currently guess the bug is somewhere in ipipe_handle_exception(). Looking at ipipe-2.6.git I see the following commits which could be relat= ed: x86: Fix root domain state restoring on exception return, 22.01.2010, Jan, a2bc69bd3bd2e6a8f39d8407c647d7dfd2821bc0 x86/ipipe: Fix up regs unconditionally on exceptions, 12.04.2010, Jan, ed2e37c05c897a46ea895a0dfbf08086057e2bcf Stefan --------------enigE17A7E88FF45609495129D9D Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkxr5hcACgkQIPTw9rIdn6qVdwCcCtsK6FHs945ulO3GK8brQt+9 l1sAn2fGdLVudnmL64KmztRhxCKa2wkH =mukE -----END PGP SIGNATURE----- --------------enigE17A7E88FF45609495129D9D--