From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757403Ab2KICTg (ORCPT ); Thu, 8 Nov 2012 21:19:36 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:41690 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756523Ab2KICTf (ORCPT ); Thu, 8 Nov 2012 21:19:35 -0500 X-AuditID: cbfee60e-b7f8e6d0000072f3-64-509c68353c84 Date: Fri, 09 Nov 2012 02:19:33 +0000 (GMT) From: Jongman Heo Subject: How to debug system freeze (not detected by kernel debug options) To: "linux-kernel@vger.kernel.org" Reply-to: jongman.heo@samsung.com MIME-version: 1.0 X-MTR: 20121109021300301@jongman.heo Msgkey: 20121109021300301@jongman.heo X-EPLocale: ko_KR.utf-8 X-Priority: 3 X-EPWebmail-Msg-Type: personal X-EPWebmail-Reply-Demand: 0 X-EPApproval-Locale: X-EPHeader: ML X-EPTrCode: X-EPTrName: X-MLAttribute: X-RootMTR: 20121024024610830@jongman.heo X-ParentMTR: 20121029053525306@jongman.heo X-ArchiveUser: X-CPGSPASS: N Content-type: text/plain; charset=utf-8 MIME-version: 1.0 Message-id: <574089.21861352427573311.JavaMail.weblogic@epml01> DLP-Filter: Pass X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrIKsWRmVeSWpSXmKPExsVy+t8zTV3TjDkBBvtuyFtc3jWHzYHR4/Mm uQDGKC6blNSczLLUIn27BK6MWXNPMRccYq/Y8fIEYwPjEvYuRk4OIQE1iZufDzGC2BICJhJX Zp1lhbDFJC7cW88GUbOMUaL/rUcXIwdYTd9B7y5GLqDwfEaJFb9WsYDUsAioSNxZsoAZxGYT 0JHo+L8fbI6wgLfEscnXwXaJCDhK7Dj4FWqmosS1pYvBbF4BQYmTM5+wQOxVkZg7/Q0byC5e AVWJ3wtcIcLiEhfmXmKHsHklZrQ/hSqXk5j2dQ0zhC0tcX7WBkaY8xd/fwwV55c4dnsHE8T5 vBJP7gfDjNm9+QsbhC0gMfXMQahWTYn2k8egWrUlVt26yQYzZtep5cwwvfe3zGUCsZmBPpnS /ZAdZDwzUO/6XfronuIVsJfYv/ABMySgBCS+TT7EMoFRaRaSsllIJs1CmISsZAEjyypG0dSC 5ILipPRUE73ixNzi0rx0veT83E2MkHTAt4NxXoPFIUYBDkYlHt7EB7MDhFgTy4orcw8xSnAw K4nw1jHNCRDiTUmsrEotyo8vKs1JLT7E6AN01ERmKdHkfGCqyiuJNzQ2MDY0tDQ0M7U0NcAh rCTOq1QxPUBIID2xJDU7NbUgtQhmHBMHp1QDo+a+yRn76rbIzdj889Gr8Fe7Lrx1vfDqX+9D OcXnpYsETqn+O7vwS81fs9hvE3eYl9SVnnK5XNs01fKQ+fNyxfAq5XoLy/Nlh/+yfzG7b/vh wImQ3U8PHHbN4jm3w+ISm7iaWLAJo+Lji7VCihmsUU/iOoujdRdEKs878db33sNLqlJhk3Y9 KlRiKc5INNRiLipOBAAXQm35NAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrNKsWRmVeSWpSXmKPExsVy+t/tGbqmGXMCDDbvlba4vGsOmwOjx+dN cgGMURk2GamJKalFCql5yfkpmXnptkrewfHO8aZmBoa6hpYW5koKeYm5qbZKLj4Bum6ZOUBD lRTKEnNKgUIBicXFSvp2NkX5pSWpChn5xSW2StFGBsZ6RqYmekbGBnomBrFWhgYGRqZAVQkZ GbPmnmIuOMResePlCcYGxiXsXYycHEICahI3Px9i7GLk4JAQMJHoO+gNEpYQEJO4cG89Wxcj F1DJfEaJFb9WsYAkWARUJO4sWcAMYrMJ6Eh0/N/PCmILC3hLHJt8HWymiICjxI6DX9kg5itK XFu6GMzmFRCUODnzCQvEAhWJudPfsIHs5RVQlfi9wBUiLC5xYe4ldgibV2JG+1OocjmJaV/X MEPY0hLnZ21ghLlz8ffHUHF+iWO3dzBBvMIr8eR+MMyY3Zu/sEHYAhJTzxyEatWUaD95DKpV W2LVrZtsMGN2nVrODNN7f8tcJhCbGeiTKd0P2UHGMwP1rt+lj+4pXgF7if0LHzBPYJSdhSQ1 C0n3LIRuZCULGFlWMYqmFiQXFCelp5roFSfmFpfmpesl5+duYgSnoGd8OxjnNVgcYhTgYFTi 4U18MDtAiDWxrLgy9xCjBAezkghvHdOcACHelMTKqtSi/Pii0pzU4kOMPsAYm8gsJZqcD0yP eSXxhsYGxoaGluYGpoZGFjiElcR5lSqmBwgJpCeWpGanphakFsGMY+LglGpgbLp65cEi/7Ln uRffpu9xz123dWXV7i5HyZxrmbsDK57YSS5Se7LS+LrjqWVKzY5ZQSxX5m26c6rVOSv/9FJm Yb+p2w7unsjINE146Uf3OaLiftUlJ+Y4V1rNcFTzWKzZKsipM5/5QI2zUPPvTa13Kqp2WoS2 LnLwtnSP2OYutSmlk6/87+OfSizFGYmGWsxFxYkAmy6NDW4DAAA= X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id qA92JfXY028947 Dear kernel hackers, I have a problem in SMP environment, in x86 platform (Intel Atom based embedded system) In UP, there is no issue, but in SMP, system freezed in tens of minutes (or shorter), if I perform IO test with flash memory and HDD simultaneously (using dd). I enabled relevant kernel debug options, like LOCKDEP, DETECT_SOFTLOCKUP, DETECT_HUNG_TASK, along with "nmi_watchdog=1". (Yeah, this is somewhat old kernel, 2.6.35.14). But no debug message is shown. (I had checked that NMI interrupt count correctly increase.). Do you have any thoughts what can cause system freeze without being detected by LOCKDEP, watchdog, and other options. Thanks in advance, Jongman.{.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I