From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@bugzilla.kernel.org Subject: [Bug 25832] kernel crashes upon resume if usb devices are removed when suspended Date: Sun, 13 Mar 2011 03:01:48 GMT Message-ID: <201103130301.p2D31mmG021814@demeter1.kernel.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" To: linux-ext4@vger.kernel.org Return-path: Received: from demeter1.kernel.org ([140.211.167.39]:42292 "EHLO demeter1.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756323Ab1CMDBt (ORCPT ); Sat, 12 Mar 2011 22:01:49 -0500 Received: from demeter1.kernel.org (localhost.localdomain [127.0.0.1]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p2D31mj1021815 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 13 Mar 2011 03:01:48 GMT In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: https://bugzilla.kernel.org/show_bug.cgi?id=25832 --- Comment #46 from rocko 2011-03-13 03:01:46 --- It's always a possibility, but I don't think this is a RAM problem. I have run memory tests fairly recently to try and rule it out. One of the BIOS RAM tests is very extensive: I didn't run it to completion because it would have taken many hours to complete, but did let it go for 20 minutes or so. It tested quite a few patterns and didn't find any failures. I also occasionally make it run the 'quick' memory check upon boot (about 5 minutes worth) and it never finds problems. There are other indicators that this probably isn't a hardware problem: * I have seen this bug occur on another PC that was running 2.6.37 at the time - it crashed when I unplugged the external USB hub without unmounting the drives first. * I don't get crashes during normal operation - only after removing USB drives. And only if they were mounted prior to removing them. * Just now I have been testing Ubuntu's 2.6.35-28-generic kernel more extensively and haven't been able to crash it (around 20 suspend/resume cycles without incident). * I did manage to crash a VM running Ubuntu 11.04 with kernel 2.6.38-rc8 by using VirtualBox's USB menu in the status bar to repeatedly attach and remove an external USB drive. It took about ten goes before it hung. In the past, the host has usually crashed during this test, but this time I was running 2.6.35 on the host and only the VM crashed. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug.