From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750924AbVK2Iid (ORCPT ); Tue, 29 Nov 2005 03:38:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750929AbVK2Iid (ORCPT ); Tue, 29 Nov 2005 03:38:33 -0500 Received: from nproxy.gmail.com ([64.233.182.195]:1016 "EHLO nproxy.gmail.com") by vger.kernel.org with ESMTP id S1750897AbVK2Iid (ORCPT ); Tue, 29 Nov 2005 03:38:33 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=A/Ic5nnB2vcbAV9ex4AfcPD8Li9p6X98eyh0Zh37uOLSLs1j0O8d7xXKtiMfqfbkSrjFLtdVFz2M4CcsbBTwA/GBu3Tpw4GCmuvAYd3fXKymnRCvaGa2VDKMa4N5tDnaopI9zAFSXOnjn6Uzoo9OJYzxAxplT9t2RPf5PXYhmSM= Message-ID: <121a28810511290038h37067fecx@mail.gmail.com> Date: Tue, 29 Nov 2005 09:38:29 +0100 From: Grzegorz Nosek To: Andrew Morton Subject: Re: [PATCH] race condition in procfs Cc: linux-kernel@vger.kernel.org In-Reply-To: <20051129000916.6306da8b.akpm@osdl.org> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_9541_6748570.1133253509231" References: <121a28810511282317j47a90f6t@mail.gmail.com> <20051129000916.6306da8b.akpm@osdl.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org ------=_Part_9541_6748570.1133253509231 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline 2005/11/29, Andrew Morton : > > I found a race condition in procfs on SMP systems. The result is an > > oops in processes like pidof. Apparently ->proc_read() gets passed a > > potentially NULL pointer. > > Do you know what the race is? Apparently it's a race between deleting a process and accessing its /proc/pid entries. It came out in pidof while it was accessing /proc/pid/stat (fs/proc/array.c:do_task_stat crashed on first instruction - it was an inline function accessing task->state, get_task_state IIRC). oops (with vserver history data - I'm using a patch mentioned below) is attached. > > How does one reproduce it? I managed to reproduce it (although not reliably) during high CPU load and I/O (parallel kernel compiles) on SMP systems with the vserver patch (http://linux-vserver.org, the exact patch is http://vserver.13thfloor.at/Experimental/patch-2.6.14.2-vs2.1.0-rc8.diff), but the vserver maintainer pointed out that it probably is a mainline issue. We're not using 2.6 systems too much except for the vserver test beds so I cannot tell if it happens on vanilla kernels. > > > The following micro-patch seems to fix it. > > It might be right, or it might be a workaround.. > I'm not a kernel guru so it's just my proposal. Can it break anything? An alternative _might_ be somewhat coarser task_struct locking (do_task_stat grabs a spinlock but then it's already too late). However, if no "right" solution appears, I'll keep using my two-liner because it seems to help, at least in my setup. Best regards, Grzegorz Nosek ------=_Part_9541_6748570.1133253509231 Content-Type: application/octet-stream; name="oops.s35" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="oops.s35" Tm92IDI3IDAwOjE1OjI2IHMzNSBbNDMyODE1NzQuMjQwMDAwXSBVbmFibGUgdG8gaGFuZGxlIGtl cm5lbCBOVUxMIHBvaW50ZXIgZGVyZWZlcmVuY2UKTm92IDI3IDAwOjE1OjI2IHMzNSBhdCB2aXJ0 dWFsIGFkZHJlc3MgMDAwMDAwMDAgCk5vdiAyNyAwMDoxNToyNiBzMzUgWzQzMjgxNTc0LjI0MDAw MF0gIHByaW50aW5nIGVpcDogCk5vdiAyNyAwMDoxNToyNiBzMzUgWzQzMjgxNTc0LjI0MDAwMF0g YTAxYjUwZWIgCk5vdiAyNyAwMDoxNToyNiBzMzUgWzQzMjgxNTc0LjI0MDAwMF0gKnBkZSA9IDAw MDAwMDAwIApOb3YgMjcgMDA6MTU6MjYgczM1IFs0MzI4MTU3NC4yNDAwMDBdIE9vcHM6IDAwMDAg WyMxXSAKTm92IDI3IDAwOjE1OjI2IHMzNSBbNDMyODE1NzQuMjQwMDAwXSBTTVAgCk5vdiAyNyAw MDoxNToyNiBzMzUgIApOb3YgMjcgMDA6MTU6MjYgczM1IFs0MzI4MTU3NC4yNDAwMDBdIE1vZHVs ZXMgbGlua2VkIGluOgpOb3YgMjcgMDA6MTU6MjYgczM1IGlwdF9vd25lcgpOb3YgMjcgMDA6MTU6 MjYgczM1IGlwdF9zdGF0ZQpOb3YgMjcgMDA6MTU6MjYgczM1IGlwdGFibGVfZmlsdGVyCk5vdiAy 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