From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753905Ab0JTPuX (ORCPT ); Wed, 20 Oct 2010 11:50:23 -0400 Received: from mail-yx0-f174.google.com ([209.85.213.174]:57409 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751564Ab0JTPuW (ORCPT ); Wed, 20 Oct 2010 11:50:22 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type :content-transfer-encoding; b=GWi293gPr6H21rAzV4ULcFIoc/Y7SWNr/VmfdVM/i81jEqoSefIaxrjWPGjsDoxi3w 3shErCJ3P8fRP7B+YZLUqDmXqSuu36zIPkT/r/dmG6gKg8BJyq3d2+ggbnyYef30Sa1b h9Bcx7HOagrnRPmPyUi31CjtJT/ODyIbGoi7I= Message-ID: <4CBF0FB7.3000602@gmail.com> Date: Wed, 20 Oct 2010 17:50:15 +0200 From: Jiri Slaby User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; cs-CZ; rv:1.9.2.11) Gecko/20101013 SUSE/3.1.5 Thunderbird/3.1.5 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org CC: akpm@linux-foundation.org, mm-commits@vger.kernel.org, Peter Zijlstra , Ingo Molnar Subject: ptrace BUG [was: mmotm 2010-10-13-17-13 uploaded] References: <201010140044.o9E0iuR3029069@imap1.linux-foundation.org> In-Reply-To: <201010140044.o9E0iuR3029069@imap1.linux-foundation.org> X-Enigmail-Version: 1.1.2 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/14/2010 02:13 AM, akpm@linux-foundation.org wrote: > The mm-of-the-moment snapshot 2010-10-13-17-13 has been uploaded to Hi, I tried to run a process in gdb and got this BUG: BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 IP: [] fetch_bp_busy_slots.clone.1+0x28/0x1c0 PGD 1bacfa067 PUD 13b7f1067 PMD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/virtual/net/tun0/statistics/collisions CPU 1 Modules linked in: dvb_usb_af9015 dvb_usb Pid: 18934, comm: gdb Not tainted 2.6.36-rc7-mm1_64+ #1286 To be filled by O.E.M./To Be Filled By O.E.M. RIP: 0010:[] [] fetch_bp_busy_slots.clone.1+0x28/0x1c0 RSP: 0018:ffff8801b71a3ca8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8801b71a3d18 RCX: 0000000000000000 RDX: ffff8801b71a3fd8 RSI: ffff88013bafc800 RDI: ffff8801b71a3d18 RBP: ffff8801b71a3cf8 R08: ffffffff81039620 R09: ffff88013bafc800 R10: fffe060673f40000 R11: 0000000000000001 R12: ffff88013bafc800 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88013bafc800 FS: 00007f0acb802700(0000) GS:ffff8800af280000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 0000000188f40000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process gdb (pid: 18934, threadinfo ffff8801b71a2000, task ffff88019ddfee80) Stack: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 <0> 0000000000000000 ffff88013bafc800 ffff88013bafc800 0000000000000000 <0> 0000000000000000 ffff88013bafc800 ffff8801b71a3d38 ffffffff810c5dfa Call Trace: [] __reserve_bp_slot+0x5a/0x90 [] ? mutex_lock+0x19/0x50 [] reserve_bp_slot+0x20/0x40 [] register_perf_hw_breakpoint+0x11/0x50 [] ? filemap_fault+0x122/0x4b0 [] hw_breakpoint_event_init+0x2d/0x50 [] perf_init_event+0x36/0x80 [] perf_event_alloc+0x248/0x350 [] ? ptrace_triggered+0x0/0x40 [] perf_event_create_kernel_counter+0x2c/0x150 [] register_user_hw_breakpoint+0x11/0x20 [] ptrace_set_breakpoint_addr+0xde/0x100 [] ptrace_set_debugreg+0x55/0x80 [] arch_ptrace+0xe2/0x370 [] sys_ptrace+0x68/0xc0 [] ? page_fault+0x1f/0x30 [] system_call_fastpath+0x16/0x1b Code: 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 49 89 f4 53 48 89 fb 48 83 ec 28 44 8b b6 dc 01 00 00 48 8b 86 80 01 00 00 45 85 f6 <4c> 8b a8 80 00 00 00 78 5f 48 c7 c0 d8 e2 00 00 4d 63 f6 4a 8b RIP [] fetch_bp_busy_slots.clone.1+0x28/0x1c0 RSP CR2: 0000000000000080 ---[ end trace 8199f8c45e224e74 ]--- psi[18938] trap int3 ip:7ffff3bdaa01 sp:7fffffffccc8 error:0 Is there a pacth for this already? Or should I investigate further? regards, -- js