Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753381AbYJBJox (ORCPT ); Thu, 2 Oct 2008 05:44:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753424AbYJBJog (ORCPT ); Thu, 2 Oct 2008 05:44:36 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:55931 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753368AbYJBJof (ORCPT ); Thu, 2 Oct 2008 05:44:35 -0400 Date: Thu, 2 Oct 2008 11:38:35 +0200 From: Ingo Molnar To: Steven Rostedt Cc: Linus Torvalds , Peter Zijlstra , Jonathan Corbet , Mathieu Desnoyers , LKML , Thomas Gleixner , Andrew Morton , prasad@linux.vnet.ibm.com, "Frank Ch. Eigler" , David Wilder , hch@lst.de, Martin Bligh , Christoph Hellwig , Masami Hiramatsu , Steven Rostedt , Arnaldo Carvalho de Melo Subject: [boot crash] Re: [PATCH] ring-buffer: fix build error Message-ID: <20081002093835.GA17699@elte.hu> References: <20080930092001.69849210@bike.lwn.net> <1222790072.24384.21.camel@twins>

<20081002085030.GF26084@elte.hu> <20081002085145.GA3202@elte.hu> <20081002090517.GA8708@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081002090517.GA8708@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3934 Lines: 74 * Ingo Molnar wrote: > > that was for the type filter commit. The 3 patches i've picked up into > > tip/tracing/ring-buffer are: > > > > b6eeea4: ftrace: preempt disable over interrupt disable > > 52abc82: ring_buffer: allocate buffer page pointer > > da78331: ftrace: type cast filter+verifier > > trivial build fix below. ok, these latest ring-buffer updates cause more serious trouble, i just got this boot crash on a testbox: [ 0.324003] calling tracer_alloc_buffers+0x0/0x14a @ 1 [ 0.328008] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 0.332001] IP: [] ring_buffer_alloc+0x207/0x3fc [ 0.332001] PGD 0 [ 0.332001] Oops: 0000 [1] SMP [ 0.332001] CPU 0 [ 0.332001] Modules linked in: [ 0.332001] Pid: 1, comm: swapper Not tainted 2.6.27-rc8-tip-01064-gd163d6b-dirty #1 [ 0.332001] RIP: 0010:[] [] ring_buffer_alloc+0x207/0x3fc [ 0.332001] RSP: 0018:ffff88003f9d7de0 EFLAGS: 00010287 [ 0.332001] RAX: 0000000000000000 RBX: ffffffff80b08404 RCX: 0000000000000067 [ 0.332001] RDX: 0000000000000004 RSI: 00000000000080d0 RDI: ffffffffffffffc0 [ 0.332001] RBP: ffff88003f9d7e80 R08: ffff88003f8010b4 R09: 000000000003db02 [ 0.332001] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88003f801600 [ 0.332001] R13: 0000000000000004 R14: ffff88003f801580 R15: ffff88003f801618 [ 0.332001] FS: 0000000000000000(0000) GS:ffffffff80a68280(0000) knlGS:0000000000000000 [ 0.332001] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b [ 0.332001] CR2: 0000000000000008 CR3: 0000000000201000 CR4: 00000000000006e0 [ 0.332001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 0.332001] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 0.332001] Process swapper (pid: 1, threadinfo ffff88003f9d6000, task ffff88003f9d8000) [ 0.332001] Stack: ffff88003f9d7df0 ffff88003f9d7e40 0000000000000283 ffffffff80b08404 [ 0.332001] ffffffff80b08404 ffff88003f801598 0000000000000000 ffff88003f801598 [ 0.332001] ffff88003f801580 0000016000000000 ffff88003f801600 ffff88003f9a2a40 [ 0.332001] Call Trace: [ 0.332001] [] ? tracer_alloc_buffers+0x0/0x14a [ 0.332001] [] tracer_alloc_buffers+0x26/0x14a [ 0.332001] [] ? tracer_alloc_buffers+0x0/0x14a [ 0.332001] [] do_one_initcall+0x56/0x144 [ 0.332001] [] ? native_smp_prepare_cpus+0x2aa/0x2ef [ 0.332001] [] kernel_init+0x69/0x20e [ 0.332001] [] child_rip+0xa/0x11 [ 0.332001] [] ? __atomic_notifier_call_chain+0xd/0xf [ 0.332001] [] ? kernel_init+0x0/0x20e [ 0.332001] [] ? child_rip+0x0/0x11 [ 0.332001] Code: 48 8b 05 d9 b2 7e 00 49 63 d5 48 63 0d 1b b2 7e 00 48 8b 9d 78 ff ff ff be d0 80 00 00 48 8b 04 d0 48 89 cf 48 83 c1 27 48 f7 df <48> 8b 40 08 48 21 cf 8b 14 03 e8 4e b5 02 00 48 85 c0 48 89 c3 [ 0.332001] RIP [] ring_buffer_alloc+0x207/0x3fc [ 0.332001] RSP [ 0.332001] CR2: 0000000000000008 [ 0.332002] Kernel panic - not syncing: Fatal exception full serial log and config attached. I'm excluding these latest commits from tip/master for now: 339ce9a: ring-buffer: fix build error b6eeea4: ftrace: preempt disable over interrupt disable 52abc82: ring_buffer: allocate buffer page pointer da78331: ftrace: type cast filter+verifier i'm quite sure 52abc82 causes this problem. Another 64-bit testbox crashed too meanwhile. Ingo -- 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/