From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753094Ab0ETPsa (ORCPT ); Thu, 20 May 2010 11:48:30 -0400 Received: from lennier.cc.vt.edu ([198.82.162.213]:57478 "EHLO lennier.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751835Ab0ETPs2 (ORCPT ); Thu, 20 May 2010 11:48:28 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: Andrew Morton Cc: linux-kernel@vger.kernel.org Subject: mmotm 2010-05-19 BUG weirdness... In-Reply-To: Your message of "Wed, 19 May 2010 16:13:09 PDT." <201005192341.o4JNf5Hv012931@imap1.linux-foundation.org> From: Valdis.Kletnieks@vt.edu References: <201005192341.o4JNf5Hv012931@imap1.linux-foundation.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1274370470_3881P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Thu, 20 May 2010 11:47:50 -0400 Message-ID: <4637.1274370470@localhost> X-Mirapoint-Received-SPF: 128.173.14.107 localhost Valdis.Kletnieks@vt.edu 2 pass X-Mirapoint-IP-Reputation: reputation=neutral-1, source=Fixed, refid=n/a, actions=MAILHURDLE SPF TAG X-Junkmail-Info: (45) HELO_LOCALHOST X-Junkmail-Status: score=45/50, host=dagger.cc.vt.edu X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A020201.4BF559A7.0008,ss=1,fgs=0, ip=0.0.0.0, so=2009-09-22 00:05:22, dmn=2009-09-10 00:05:08, mode=multiengine X-Junkmail-IWF: false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1274370470_3881P Content-Type: text/plain; charset=us-ascii On Wed, 19 May 2010 16:13:09 PDT, akpm@linux-foundation.org said: > The mm-of-the-moment snapshot 2010-05-19-16-12 has been uploaded to > > http://userweb.kernel.org/~akpm/mmotm/ So I'm looking closer at the BUG I just posted - I had deleted two further BUGs because they were obviously follow-ons to the original. But then... Note the following 2 lines: [ 35.357018] note: keymap[2481] exited with preempt_count 1 [ 35.360503] BUG: scheduling while atomic: keymap/2481/0x10000002 The kernel reports the instigating process exited - and then reports it as the offender for a "scheduling while atomic". Insufficient attempted cleanup after the first BUG? Do we care because this is a sign of a scheduler bug that could trip on a non-BUG as well, or is it "all bets are off" because of the first BUG? [ 35.294528] BUG: unable to handle kernel NULL pointer dereference at (null) [ 35.295005] IP: [<(null)>] (null) [ 35.296935] PGD 11da3c067 PUD 11d4ad067 PMD 0 [ 35.296935] Oops: 0010 [#1] PREEMPT SMP [ 35.299667] last sysfs file: /sys/devices/pci0000:00/0000:00:1a.7/usb1/idVendor [ 35.300328] CPU 0 [ 35.300328] Modules linked in: [ 35.300328] [ 35.300328] Pid: 2481, comm: keymap Not tainted 2.6.34-mmotm0519 #1 0X564R/Latitude E6500 [ 35.300328] RIP: 0010:[<0000000000000000>] [<(null)>] (null) [ 35.300328] RSP: 0018:ffff88011d4d5cb0 EFLAGS: 00010046 [ 35.310163] RAX: 0000000000000000 RBX: ffff88011c03e000 RCX: 0000000000000081 [ 35.310163] RDX: ffff88011d4d5cc4 RSI: ffff88011d4d5cc8 RDI: ffff88011c03e000 [ 35.310163] RBP: ffff88011d4d5d28 R08: ffff88011e9b28e8 R09: 0000000000000001 [ 35.310163] R10: ffffffff81e0b160 R11: 0000000000000004 R12: 00000000000000a4 [ 35.310163] R13: ffff88011c03e830 R14: 0000000000000286 R15: ffff88011d4d5cc8 [ 35.310163] FS: 00007f4b86283700(0000) GS:ffff880002600000(0000) knlGS:0000000000000000 [ 35.319397] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.319397] CR2: 0000000000000000 CR3: 000000011d575000 CR4: 00000000000406f0 [ 35.319397] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.319397] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 35.319397] Process keymap (pid: 2481, threadinfo ffff88011d4d4000, task ffff88011e9b28c0) [ 35.319397] Stack: [ 35.319397] ffffffff813bf3d1 ffff88011d4d5cf8 0000008100000246 00000081000000a4 [ 35.319397] <0> 0000000000000004 0000000000000000 ffff88011d4d5cc4 ffff88011cf11200 [ 35.319397] <0> ffff88011c179000 ffff88011d4d5d28 0000000000000081 00007fff9ee21fa0 [ 35.319397] Call Trace: [ 35.319397] [] ? input_set_keycode+0xad/0x12c [ 35.319397] [] evdev_do_ioctl+0x22b/0x79b [ 35.337913] [] ? __mutex_lock_common+0x564/0x580 [ 35.337913] [] ? evdev_ioctl_handler+0x3d/0x80 [ 35.341507] [] ? evdev_ioctl_handler+0x3d/0x80 [ 35.341507] [] evdev_ioctl_handler+0x63/0x80 [ 35.344034] [] evdev_ioctl+0xb/0xd [ 35.344034] [] vfs_ioctl+0x2d/0xa1 [ 35.344034] [] do_vfs_ioctl+0x494/0x4cd [ 35.344034] [] sys_ioctl+0x57/0x95 [ 35.344034] [] system_call_fastpath+0x16/0x1b [ 35.344034] Code: Bad RIP value. [ 35.344034] RIP [<(null)>] (null) [ 35.344034] RSP [ 35.344034] CR2: 0000000000000000 [ 35.357018] ---[ end trace 394fa5aa8a77b6f3 ]--- [ 35.357018] note: keymap[2481] exited with preempt_count 1 [ 35.360503] BUG: scheduling while atomic: keymap/2481/0x10000002 [ 35.361774] INFO: lockdep is turned off. [ 35.363106] Modules linked in: [ 35.364442] Pid: 2481, comm: keymap Tainted: G D 2.6.34-mmotm0519 #1 [ 35.365759] Call Trace: [ 35.367082] [] ? __debug_show_held_locks+0x1b/0x24 [ 35.368391] [] __schedule_bug+0x6d/0x72 [ 35.369716] [] schedule+0x10a/0x902 [ 35.371012] [] __cond_resched+0x13/0x1f [ 35.372305] [] _cond_resched+0x16/0x1d [ 35.373576] [] unmap_vmas+0x7b7/0x828 [ 35.374850] [] exit_mmap+0x82/0xfd [ 35.376093] [] mmput+0x43/0xcf [ 35.377339] [] exit_mm+0x11d/0x12a [ 35.378564] [] do_exit+0x2e1/0x932 [ 35.379792] [] ? kmsg_dump+0x136/0x150 [ 35.381014] [] oops_end+0x89/0x8e [ 35.382211] [] no_context+0x1f7/0x206 [ 35.383384] [] __bad_area_nosemaphore+0x187/0x1c7 [ 35.384571] [] ? __lock_acquire+0xc58/0xd09 [ 35.385751] [] bad_area_nosemaphore+0xe/0x10 [ 35.386936] [] do_page_fault+0x1f3/0x44b [ 35.388111] [] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 35.389296] [] page_fault+0x1f/0x30 [ 35.390437] [] ? input_set_keycode+0xad/0x12c [ 35.391534] [] evdev_do_ioctl+0x22b/0x79b [ 35.392639] [] ? __mutex_lock_common+0x564/0x580 [ 35.393722] [] ? evdev_ioctl_handler+0x3d/0x80 [ 35.394747] [] ? evdev_ioctl_handler+0x3d/0x80 [ 35.395748] [] evdev_ioctl_handler+0x63/0x80 [ 35.396686] [] evdev_ioctl+0xb/0xd [ 35.397627] [] vfs_ioctl+0x2d/0xa1 [ 35.398541] [] do_vfs_ioctl+0x494/0x4cd [ 35.399471] [] sys_ioctl+0x57/0x95 [ 35.400387] [] system_call_fastpath+0x16/0x1b --==_Exmh_1274370470_3881P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFL9VmmcC3lWbTT17ARAkwuAKC00l9nDHWgUD3rPi/TtK8AT50SnwCgjPVt mpObf65+/3OGIW4+zRNYtIY= =zmJV -----END PGP SIGNATURE----- --==_Exmh_1274370470_3881P--