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Date: Sat, 1 Mar 2008 00:29:12 +0530 From: Ritesh Raj Sarraf <rrs@...earchut.com> To: Alasdair G Kergon <agk@...hat.com> Cc: device-mapper development <dm-devel@...hat.com>, Herbert Xu <herbert@...dor.apana.org.au>, Christophe Saout <christophe@...ut.de>, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org Subject: Re: [dm-devel] Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt On Saturday 01 March 2008, Alasdair G Kergon wrote: > On Thu, Feb 28, 2008 at 11:20:48PM -0800, Andrew Morton wrote: > > On Thu, 28 Feb 2008 19:24:03 +0530 Ritesh Raj Sarraf <rrs@...earchut.com> wrote: > > > Kernel: 2.6.24 > > > Distribution: Debian Testing/Unstable > > > Tainted: Yes (nvidia proprietary drivers) > > Any chance you can try to reproduce it upstream e.g. in 2.6.25-rc3? > I can do that but only by Monday Evening IST. 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. The I/O scheduler in use is: rrs@...rner:/sys/block/sdb/queue$ cat scheduler noop anticipatory deadline [cfq] The kernel logs are the same like the last time but I'm attaching it. There still is a delay of 11seconds. Ritesh -- Ritesh Raj Sarraf RESEARCHUT - http://www.researchut.com "Necessity is the mother of invention." View attachment "kernel.bug.new" of type "text/plain" (31059 bytes) Download attachment "signature.asc " of type "application/pgp-signature" (190 bytes)
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