Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757347Ab0KOOpp (ORCPT ); Mon, 15 Nov 2010 09:45:45 -0500 Received: from mail-yw0-f46.google.com ([209.85.213.46]:42985 "EHLO mail-yw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754613Ab0KOOpo convert rfc822-to-8bit (ORCPT ); Mon, 15 Nov 2010 09:45:44 -0500 MIME-Version: 1.0 Date: Mon, 15 Nov 2010 15:45:42 +0100 Message-ID: Subject: kernel BUG at /build/buildd/linux-2.6.35/mm/filemap.c:128! From: =?UTF-8?B?Um9iZXJ0IMWad2nEmWNraQ==?= To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4350 Lines: 83 Hi, I was doing some fuzzing with http://code.google.com/p/iknowthis/ and my system pretty quickly crashes with the BUG() below. - Even if it's just BUG() it renders my system unusable (I'm able to type a few characters on the virtual terminal at most) - Judging from the stacktrace it's sys_madvise(..., ..., MADV_REMOVE) - I'm testing with ubuntu's 2.6.35-22-server#35 but I got similar results with 2.6.32 some time ago - I'm posting this cause diving into linux mm spaghetti code might be not a trivial task, but if nobody can see anything obvious in a day or so, I'll try to debug it mysel - I'm unable to provide a testcase by now, nor any usable state of the crashing process, cause the system becomes unusable - It crashes both linux-kernel working on a physical machine as well as on the VirtualBox emulator - I'm usually waiting from 0.5h to 12h for this crash to appear, I think it could be speed up greatly by disabling any irrelevant syscalls in the fuzzer [25142.286531] kernel BUG at /build/buildd/linux-2.6.35/mm/filemap.c:128! [25142.290627] invalid opcode: 0000 [#2] SMP [25142.290627] last sysfs file: /sys/fs/ext4/sda1/lifetime_write_kbytes [25142.301039] CPU 1 [25142.301039] Modules linked in: dccp_ipv6 decnet llc2 x25 pppoe pppox irda crc_ccitt dccp_ipv4 dccp ipx p8023 rds af_key netrom econet can atm l2cap bluetooth appletalk rose ax25 nouveau snd_hda_codec_idt ttm snd_hda_intel drm_kms_helper snd_hda_codec led_class drm psmouse snd_hwdep ppdev snd_pcm snd_timer i2c_algo_bit serio_raw i82975x_edac snd parport_pc lp soundcore edac_core snd_page_alloc parport dcdbas floppy ahci firewire_ohci firewire_core crc_itu_t tg3 libahci [25142.301039] [25142.301039] Pid: 22612, comm: iknowthis Tainted: G D W 2.6.35-22-server #35-Ubuntu 0GH911/Precision WorkStation 390 [25142.301039] RIP: 0010:[] [] __remove_from_page_cache+0xd5/0xe0 [25142.367617] RSP: 0000:ffff8800cb8a3cf8 EFLAGS: 00010002 [25142.367617] RAX: 0100000000100029 RBX: ffffea0002159670 RCX: 0000000000000000 [25142.367617] RDX: 0000000000000001 RSI: 0000000000000016 RDI: ffff880100000700 [25142.367617] RBP: ffff8800cb8a3d08 R08: 0000000000000018 R09: 0000000000000000 [25142.367617] R10: ffffea0002159678 R11: 0000000000000000 R12: ffff8800cb865188 [25142.367617] R13: ffff8800cb865188 R14: ffff8800cb8a3d88 R15: 0000000000000000 [25142.367617] FS: 0000000000000000(0000) GS:ffff880001e40000(0063) knlGS:00000000f75276c0 [25142.367617] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b [25142.367617] CR2: 00000000080ba1fc CR3: 000000012091d000 CR4: 00000000000006e0 [25142.367617] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [25142.367617] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [25142.367617] Process iknowthis (pid: 22612, threadinfo ffff8800cb8a2000, task ffff8800cb9516e0) [25142.367617] Stack: [25142.367617] ffffea0002159670 ffff8800cb8651a0 ffff8800cb8a3d28 ffffffff81101686 [25142.367617] <0> ffffea0002159670 ffff8800cb865188 ffff8800cb8a3d48 ffffffff8110c6d9 [25142.367617] <0> 0000000000000001 0000000000000008 ffff8800cb8a3e38 ffffffff8110cce0 [25142.367617] Call Trace: [25142.367617] [] remove_from_page_cache+0x36/0x60 [25142.367617] [] truncate_inode_page+0x79/0xb0 [25142.367617] [] truncate_inode_pages_range+0x160/0x460 [25142.367617] [] ? unmap_mapping_range+0xb0/0x160 [25142.367617] [] vmtruncate_range+0x98/0x100 [25142.367617] [] madvise_vma+0x17a/0x210 [25142.367617] [] sys_madvise+0x165/0x290 [25142.367617] [] ia32_sysret+0x0/0x5 [25142.367617] Code: 00 00 e8 1f 8a 1c 00 48 89 df 57 9d 0f 1f 44 00 00 5b 41 5c c9 c3 be 16 00 00 00 48 89 df e8 a3 68 01 00 48 8b 03 e9 71 ff ff ff <0f> 0b eb fe eb 05 90 90 90 90 90 55 48 89 e5 48 83 ec 10 48 89 [25142.367617] RIP [] __remove_from_page_cache+0xd5/0xe0 [25142.367617] RSP [25142.367617] ---[ end trace a262aa785b417723 ]--- -- Robert Święcki -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/