From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: [dm-devel] Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt Date: Sat, 01 Mar 2008 16:44:47 +0100 Message-ID: <47C979EF.7070906@wpkg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: dm-devel@redhat.com, LKML , agk@redhat.com, herbert@gondor.apana.org.au, Andrew Morton List-Id: dm-devel.ids Ritesh Raj Sarraf wrote: (...) > Meanwhile I was able to reproduce the bug again with the same configuration > and the same scenario. So I believe that the bug can be reproduced > consistently. > > Here are the steps: > > 1) Initialize a device using dm-crypt and LUKS > 2) Create a filesystem on top of it and mount it. > 3) Write huge amount of data (as a normal user). Something like 150GB. > > As the load goes hight (to something like 12-14), the kernel lock-up is logged > into dmesg. > At that moment, the OS is barely responsive. I tried to reproduce it on two machines running 2.6.24.2, with cfq scheduler. One machine, with 5x HDD, RAID-5, dm-crypt/LUKS, LVM, ext3 on top of it all - I created a 250 GB file, the load was 4-5. No lockups or anything. Later, removing that 250 GB file took over 7 minutes, but that's a different story. Second machine, dm-crypt on a USB-connected drive, LVM, ext3 on top of it, X with nvidia binary blob (version 169.09). I created a 190 GB file, the load was indeed pretty high - up to about 14. But still, no lockups of any kind. -- Tomasz Chmielewski http://wpkg.org