From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaehoon Chung Subject: [RFC] Kernel NULL pointer dereference for mmc Date: Tue, 12 Jul 2011 13:23:37 +0900 Message-ID: <4E1BCC49.6050708@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7BIT Return-path: Received: from mailout4.samsung.com ([203.254.224.34]:55315 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751162Ab1GLEXq (ORCPT ); Tue, 12 Jul 2011 00:23:46 -0400 Received: from epcpsbgm1.samsung.com (mailout4.samsung.com [203.254.224.34]) by mailout4.samsung.com (Oracle Communications Messaging Exchange Server 7u4-19.01 64bit (built Sep 7 2010)) with ESMTP id <0LO700G56DJ4D6I0@mailout4.samsung.com> for linux-mmc@vger.kernel.org; Tue, 12 Jul 2011 13:23:28 +0900 (KST) Received: from TNRNDGASPAPP1.tn.corp.samsungelectronics.net ([165.213.149.150]) by mmp1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LO700HA5DJ4L6@mmp1.samsung.com> for linux-mmc@vger.kernel.org; Tue, 12 Jul 2011 13:23:28 +0900 (KST) Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: "linux-mmc@vger.kernel.org" Cc: Chris Ball , Per Forlin , Philip Rakity , Kyungmin Park Hi When I tested MMC card with IOzone, i found this message.. I tried to find what problem..but i didn't find yet.. So i want to get mailing's help..Have ever seen the below message? (using SDHCI controller, eMMC 4.41 card, 8-bit buswidth) I didn't applied about post_req/pre_req in sdhci.c. (using latest kernel in mmc-tree) Also i will try to debug for this problem. Plz let me know what is problem.. [ 103.605000] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 103.605000] pgd = c0004000 [ 103.605000] [00000000] *pgd=00000000 [ 103.605000] Internal error: Oops: 805 [#1] PREEMPT SMP [ 103.605000] last sysfs file: /sys/devices/virtual/vc/vcsa1/dev [ 103.605000] Modules linked in: [ 103.605000] CPU: 0 Not tainted (2.6.39-rc7-00350-g0510951 #78) [ 103.605000] PC is at wait_for_common+0x8c/0x174 [ 103.605000] LR is at wait_for_common+0x64/0x174 [ 103.605000] pc : [] lr : [] psr: 40000093 [ 103.605000] sp : ed9efee0 ip : 00000000 fp : ed9eff1c [ 103.605000] r10: ed9efef0 r9 : ed928000 r8 : 00000002 [ 103.605000] r7 : ed9f9868 r6 : ed9ee000 r5 : 7fffffff r4 : ed9f9864 [ 103.605000] r3 : 00000000 r2 : 00000001 r1 : ed9f987c r0 : ed9efef8 [ 103.605000] Flags: nZcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel [ 103.605000] Control: 10c5387d Table: 6dbc004a DAC: 00000015 [ 103.605000] Process mmcqd/0 (pid: 856, stack limit = 0xed9ee2f0) [ 103.605000] Stack: (0xed9efee0 to 0xed9f0000) [ 103.605000] fee0: 00000000 00000001 ed928000 c004a5d0 ed9f987c 00000000 edbb4438 ed9f8800 [ 103.605000] ff00: ed9f9958 ed9f9958 ed9eff44 ed9f9800 00000000 edbb4438 edbb4438 c027b060 [ 103.605000] ff20: ed9f9800 ed9f9818 ed9f9400 00000000 ed9f9800 c0283614 edb3ee68 00000000 [ 103.605000] ff40: ed9f9800 ed9f9818 00000000 edbb4438 ed9f9400 ed9f9818 00000000 ed9f9800 [ 103.605000] ff60: 00000000 edbb4438 00000000 c0283af8 ed9f9818 edbb4438 ed9f9818 ed9ee000 [ 103.605000] ff80: ed9f9820 edb3eb20 edbb4a20 00000000 edbb4438 c0284558 00000000 ed855d8c [ 103.605000] ffa0: ed9f9818 ed9effc0 c02844b8 00000000 00000000 c006ae6c 00000000 ed9f9818 [ 103.605000] ffc0: 00000000 00000000 c002eb20 dead4ead ffffffff ffffffff ed9effd8 ed9effd8 [ 103.605000] ffe0: 00000000 ed855d8c c006adec c002eb20 00000013 c002eb20 fcfcfcfc fcfcfcfc [ 103.605000] [] (wait_for_common+0x8c/0x174) from [] (mmc_start_req+0x50/0xec) [ 103.605000] [] (mmc_start_req+0x50/0xec) from [] (mmc_blk_issue_rw_rq+0x68/0x288) [ 103.605000] [] (mmc_blk_issue_rw_rq+0x68/0x288) from [] (mmc_blk_issue_rq+0x2c4/0x2e4) [ 103.605000] [] (mmc_blk_issue_rq+0x2c4/0x2e4) from [] (mmc_queue_thread+0xa0/0x110) [ 103.605000] [] (mmc_queue_thread+0xa0/0x110) from [] (kthread+0x80/0x88) [ 103.605000] [] (kthread+0x80/0x88) from [] (kernel_thread_exit+0x0/0x8) [ 103.605000] Code: e50b9034 e3822001 e50b2038 e584a01c (e583a000) [ 103.830000] ---[ end trace 06e246d2b7931d3a ]--- [ 103.835000] note: mmcqd/0[856] exited with preempt_count 1 Regards, Jaehoon Chung