From: Geert Uytterhoeven Subject: Problem mounting ext2 using ext3? Date: Mon, 5 May 2008 23:11:46 +0200 (CEST) Message-ID: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Linux Kernel Development , Linux/m68k To: linux-ext4@vger.kernel.org Return-path: Received: from monty.telenet-ops.be ([195.130.132.56]:54522 "EHLO monty.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761542AbYEEVLt (ORCPT ); Mon, 5 May 2008 17:11:49 -0400 Sender: linux-ext4-owner@vger.kernel.org List-ID: Hi, When trying today's kernel (f74d505b58d36ceeef10e459094f0eb760681165) on ARAnyM (emulated m68k Atari), I get | Unable to handle kernel NULL pointer dereference at virtual address 000000b4 | Oops: 00000000 | Modules linked in: | PC: [<000aad9e>] ext3_sync_fs+0x16/0x4a | SR: 2304 SP: 00c09cc0 a2: 00c07a80 | d0: 00000001 d1: 00002300 d2: 00000002 d3: 00677600 | d4: 00677752 d5: 006776d2 a0: 00000000 a1: 00677600 | Process swapper (pid: 1, task=00c07a80) | Frame format=7 eff addr=000000b4 ssw=0505 faddr=000000b4 | wb 1 stat/addr/data: 0000 00000000 00000000 | wb 2 stat/addr/data: 0000 00000000 00000000 | wb 3 stat/addr/data: 0000 000000b4 00000000 | push data: 00000000 00000000 00000000 00000000 | Stack from 00c09d28: | 00c09d30 00677600 40000000 00c09df0 000909fe 00677600 00000001 00000001 | 00a02cd0 00000040 00000000 00000000 00000000 00677600 0022671c 00677600 | 00c09df0 00c09d7c 00677666 006776be 006776b2 00001000 00000000 00000000 | 00000000 00000001 00000000 00000000 00065b7a 00677600 ffffffff 00000000 | 00a02ce8 ffffffea 00065e5c 00677600 0067763a 0067b000 0067b000 0080de20 | 0022671c 00c09ea4 68646131 000e38de 00241072 00c01f70 000000d0 00241072 | Call Trace: [<000909fe>] vfs_quota_off+0xb4/0x562 | [<00001000>] kernel_pg_dir+0x0/0x1000 | [<00065b7a>] deactivate_super+0x44/0x72 | [<00065e5c>] get_sb_bdev+0x12a/0x138 | [<000e38de>] idr_pre_get+0x32/0x44 | [<000e37f8>] ida_get_new+0x10/0x16 | [<000a9930>] ext3_get_sb+0x1e/0x24 when mounting the root file system, which is ext2 (has_journal is not set). Apparently it crashes in ext3_sync_fs because EXT3_SB(sb)->s_journal is NULL. At first I thought it was an issue with the byteswapped IDE bus on Atari (a new and different solution to handle this just went into mainline), but if I disable CONFIG_EXT3 support, it boots up fine. Is this a known problem? Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds