From: Andreas Friedrich Berendsen Subject: possible ext4 race situation freezing linux Date: Wed, 25 Feb 2009 01:22:22 +1300 Message-ID: <1235478142.11758.9.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit To: linux-ext4@vger.kernel.org Return-path: Received: from ti-out-0910.google.com ([209.85.142.184]:62671 "EHLO ti-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758620AbZBXMWb (ORCPT ); Tue, 24 Feb 2009 07:22:31 -0500 Received: by ti-out-0910.google.com with SMTP id d10so2159475tib.23 for ; Tue, 24 Feb 2009 04:22:28 -0800 (PST) Sender: linux-ext4-owner@vger.kernel.org List-ID: Kernel version: 2.26.28.7 efs2progs version: 1.41.4 arch: x86_64 (amd) I made this test four times and the results were the same: linux freezes and becomes unresponsive. Only solution is to reset the box. I do not know if the problem is with the USB devices sub-subsystem or a possible ext4 race condition. That's the scenario: 1. a vg group (VGSTORE) using usb mass storage devices 2. a non-lvm controlled usb mass storage device named ANDREAS 3. a cpio operation running from the ANDREAS device to a VGSTORE.LV filesystem (LV1) 4. a cpio operation from a VGSTORE.LV filesystem (LV2) to LV1 5. a rm operation on LV1 Nothing is recorded in /var/log/messages I know that this is not too much information but I'm keen to repeat the tests and turn on any debug options necessary to track the problem. -- Berendsen