From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f172.google.com (mail-pd0-f172.google.com [209.85.192.172]) by kanga.kvack.org (Postfix) with ESMTP id 5EDCE6B0032 for ; Thu, 22 Jan 2015 03:30:10 -0500 (EST) Received: by mail-pd0-f172.google.com with SMTP id v10so374631pde.3 for ; Thu, 22 Jan 2015 00:30:10 -0800 (PST) Received: from mailout4.w1.samsung.com (mailout4.w1.samsung.com. [210.118.77.14]) by mx.google.com with ESMTPS id pp4si11903668pbb.0.2015.01.22.00.30.08 for (version=TLSv1 cipher=RC4-MD5 bits=128/128); Thu, 22 Jan 2015 00:30:08 -0800 (PST) Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244]) by mailout4.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NIK006Y9L4TFT60@mailout4.w1.samsung.com> for linux-mm@kvack.org; Thu, 22 Jan 2015 08:34:05 +0000 (GMT) Message-id: <1421915402.11239.0.camel@AMDC1943> Subject: Re: Bisected BUG: using smp_processor_id() in preemptible From: Krzysztof Kozlowski Date: Thu, 22 Jan 2015 09:30:02 +0100 In-reply-to: <20150122015344.GC21444@js1304-P5Q-DELUXE> References: <1421746712.6847.5.camel@AMDC1943> <20150122015344.GC21444@js1304-P5Q-DELUXE> Content-type: text/plain; charset=UTF-8 MIME-version: 1.0 Content-transfer-encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , Jesper Dangaard Brouer , Pekka Enberg , David Rientjes , Andrew Mo rton , BartlomiejZolnierkiewicz , KyungminPark , Marek Szyprowski On czw, 2015-01-22 at 10:53 +0900, Joonsoo Kim wrote: > On Tue, Jan 20, 2015 at 10:38:32AM +0100, Krzysztof Kozlowski wrote: > > Hi, > > > > > > Since next-20150119 booting of Exynos4 based boards is nearly impossible > > because of continuous BUG on messages. The system finally boots... but > > console log is polluted with: > > > > [ 9.700828] BUG: using smp_processor_id() in preemptible [00000000] code: udevd/1656 > > [ 9.708525] caller is kfree+0x8c/0x198 > > [ 9.712229] CPU: 2 PID: 1656 Comm: udevd Tainted: G W 3.19.0-rc4-00279-gd2dc80750ee0 #1630 > > [ 9.721501] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) > > [ 9.727602] [] (unwind_backtrace) from [] (show_stack+0x10/0x14) > > [ 9.735324] [] (show_stack) from [] (dump_stack+0x70/0xbc) > > [ 9.742525] [] (dump_stack) from [] (check_preemption_disabled+0xf8/0x128) > > [ 9.751114] [] (check_preemption_disabled) from [] (kfree+0x8c/0x198) > > [ 9.759265] [] (kfree) from [] (uevent_show+0x38/0x104) > > [ 9.766210] [] (uevent_show) from [] (dev_attr_show+0x1c/0x48) > > [ 9.773763] [] (dev_attr_show) from [] (sysfs_kf_seq_show+0x8c/0x10c) > > [ 9.781920] [] (sysfs_kf_seq_show) from [] (kernfs_seq_show+0x24/0x28) > > [ 9.790172] [] (kernfs_seq_show) from [] (seq_read+0x1ac/0x480) > > [ 9.797806] [] (seq_read) from [] (__vfs_read+0x18/0x4c) > > [ 9.804833] [] (__vfs_read) from [] (vfs_read+0x7c/0x100) > > [ 9.811950] [] (vfs_read) from [] (SyS_read+0x40/0x8c) > > [ 9.818810] [] (SyS_read) from [] (ret_fast_syscall+0x0/0x30) > > > > I bisected this to: > > > > d2dc80750ee05ceb03c9b13b0531a782116d1ade > > Author: Joonsoo Kim > > Date: Sat Jan 17 11:23:23 2015 +1100 > > mm/slub: optimize alloc/free fastpath by removing preemption on/off > > > > Full dmesg and config attached. > > > > Any ideas? > > Hello, > > This issue will be fixed in next mmotm release. > Following patch is next version of > commit d2dc80750ee05ceb03c9b13b0531a782116d1ade. > > https://lkml.org/lkml/2015/1/19/17 Great! Thanks. Krzysztof -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org