From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753334AbbE1JsK (ORCPT ); Thu, 28 May 2015 05:48:10 -0400 Received: from mx.mylinuxtime.de ([148.251.109.235]:39922 "EHLO mx.mylinuxtime.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753632AbbE1JsB (ORCPT ); Thu, 28 May 2015 05:48:01 -0400 X-Greylist: delayed 588 seconds by postgrey-1.27 at vger.kernel.org; Thu, 28 May 2015 05:48:01 EDT DKIM-Filter: OpenDKIM Filter v2.9.2 mx.mylinuxtime.de 0917424B29 Date: Thu, 28 May 2015 11:37:59 +0200 From: Christian Hesse To: linux-kernel@vger.kernel.org Subject: task kworker / kloopd blocked for more than 120 seconds Message-ID: <20150528113759.03088f57@leda.localdomain> X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.28; x86_64-unknown-linux-gnu) X-Face: %O:rCSkHSKf7^4uF|FD$9$I0}g$nbnS1{DYPvs#:,~e`).mzj\$P9]V!WCveE/XdbL,L!{)6v%x4\Bt!b#{;dS&h"7l=ow'^({02!2%XOugod|u*mYBVm-OS:VpZ"ZrRA4[Q&zye,^j;ftj!Hxx\1@;LM)Pz)|B%1#sfF;s;,N?*K*^) Face: 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 MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; boundary="Sig_/w3Dw_iW9gztTU=Li8gI6FiI"; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Sig_/w3Dw_iW9gztTU=Li8gI6FiI Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Hello everybody, I am experiencing issues on a live system based on Arch Linux [0][1] with Linux kernel 4.0.x when booted in RAM mode (parameter 'copytoram') [2]. Probably the problem exists some time longer, I am not sure when this first happened and what versions are effected. The boot sequence looks like this: -> boot kernel -> start initramfs -> get the squashfs image file (there is no difference with loop mount, nbd or http) -> root filesystem is set up with loop devices and device mapper -> boot continues The root filesystem is accessed as follows: -> ext4 filesystem -> device mapper snapshot target -> /dev/loop1: r/o ext4 image -> mounted squashfs -> /dev/loop0: squashfs image -> /dev/loop2: r/w COW image (sparse file) =20 Assembling the root filesystem stack always succeeds, but sometimes boot ha= ngs with a lot of: INFO: task kworker/u#:#:### blocked for more than 120 seconds and a single: INFO: task kloopd/### blocked for more than 120 seconds Any idea what goes wrong? Looks like a race condition or deadlock. [0] https://wiki.archlinux.org/index.php/Archiso [1] https://projects.archlinux.org/archiso.git/ [2] https://projects.archlinux.org/archiso.git/tree/docs/README.bootparams --=20 main(a){char*c=3D/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Chris get my mail address: */=3D0;b=3Dc[a+= +];) putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);} --Sig_/w3Dw_iW9gztTU=Li8gI6FiI Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJVZuH3AAoJEIlFIdfMgPR22DoIAK3WkZMME497TwLmi3KlcFpC lnNMrnnn1Ez9K2eEc6y4gq+HLGVChwa62XdU+eURcyXxpBEfac6tdXntizeHZSSB DkLwb/GMd3AblitEdJqd3EEz3s6QVqnDRZcXz7OSkkAAqnApvnZ+oZecLQywwQyj aU6mKQtamVmy698dfPiXF0zg1xMj7jkS92KnB15QJgzSxrVM45tGTbRwl1Sw4+zU wBLkPv6ir+HXNO6P5lsqyl1rbPkkxVCOtklSmVW4FM606ef175ttCTH8Znw3NQon iqnfYarPSDAy0zFNqUpViv7+HurTv8llbanOJjupktTGxAQjwA7zRwE0DWGhscA= =ZMZQ -----END PGP SIGNATURE----- --Sig_/w3Dw_iW9gztTU=Li8gI6FiI--