From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1CTkW0-000692-Q4 for user-mode-linux-devel@lists.sourceforge.net; Mon, 15 Nov 2004 09:19:44 -0800 Received: from smtp005.mail.ukl.yahoo.com ([217.12.11.36]) by sc8-sf-mx2.sourceforge.net with smtp (Exim 4.41) id 1CTkW0-0008U6-5F for user-mode-linux-devel@lists.sourceforge.net; Mon, 15 Nov 2004 09:19:44 -0800 From: Blaisorblade Subject: Re: [uml-devel] 2.4.27 guest bug reconfirmed Re bug report [ 745826 ] run cat /dev/urandom References: <418E5CA1.90308@praguespringpeople.org> <419737C6.3060904@praguespringpeople.org> In-Reply-To: <419737C6.3060904@praguespringpeople.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200411151821.11779.blaisorblade_spam@yahoo.it> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Mon, 15 Nov 2004 18:21:11 +0100 To: user-mode-linux-devel@lists.sourceforge.net Cc: Struan Bartlett On Sunday 14 November 2004 11:47, Struan Bartlett wrote: > I've now tested for this bug using a simplified methodology on the > latest patched-versions of the host (2.4.27 and 2.6.8) and guest (2.4.27 > and 2.6.9). > _New methodology_ > My Debian guest system raises two xterms at startup. On each I log in as > root. On one, I enter: > while true; do echo >/dev/null; done > On the second, I enter: > cat /dev/urandom > The devastating symptom: within 5 seconds the guest kernel has paniced > and exited with the message (below) "kernel BUG at sched.c:564!". > > _Findings_ > guest 2.6.9: patched with uml-2.6.9-bb2.patch.bz2 - I am pleased to say > I have not so far been able to reproduce this bug on this configuration. > guest 2.4.27: patched with uml-2.4.27-bs1.patch and > uml-patch-2.4.24-1base.patch - no change; this bug is readily > reproducible and so IS NOT FIXED, regardless of whether the guest is run > on host 2.4.27 or 2.6.8 > _Conclusion_ > > If such a simple pair of commands as this causes such devastating > consequences, it seems the 2.4.27 kernel sched.c line 564 needs to be > taken a look at - unless, that is, Jeff Dike's recent post about > uml-patch-2.4.27-1 "a nasty scheduler race fixed" addresses this bug. I may be wrong, but I think I should have picked that patch into 2.4.27-bs1. > Jeff: where can I get your uml-patch-2.4.27-1 ? It's at http://user-mode-linux.sourceforge.net/dl-ists.html I'll take a look at your report - there is one patch applied on 2.6 that seemed unneeded on 2.4 until now - this may be reconsidered... > Struan -- Paolo Giarrusso, aka Blaisorblade Linux registered user n. 292729 ------------------------------------------------------- This SF.Net email is sponsored by: InterSystems CACHE FREE OODBMS DOWNLOAD - A multidimensional database that combines robust object and relational technologies, making it a perfect match for Java, C++,COM, XML, ODBC and JDBC. www.intersystems.com/match8 _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel