From chemistry-request@server.ccl.net Tue Jun 6 12:47:17 2000 Received: from anubis.lms.mit.edu (anubis.lms.mit.EDU [18.60.0.150]) by server.ccl.net (8.8.7/8.8.7) with ESMTP id MAA24252 for ; Tue, 6 Jun 2000 12:47:16 -0400 Received: from lms.mit.edu (IDENT:dfgreen@localhost [127.0.0.1]) by anubis.lms.mit.edu (8.9.3/8.9.3) with ESMTP id MAA18380 for ; Tue, 6 Jun 2000 12:46:58 -0400 Sender: dfgreen@anubis.lms.mit.edu Message-ID: <393D2B02.1F126E38@lms.mit.edu> Date: Tue, 06 Jun 2000 12:46:58 -0400 From: "David F. Green" X-Mailer: Mozilla 4.7 [en] (X11; U; Linux 2.2.14-5.0 i586) X-Accept-Language: en MIME-Version: 1.0 To: chemistry@ccl.net Subject: Floating point errors with Redhat linux kernel 2.2.14-5.0smp Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Dear CCLers, I'd just like to warn anyone using RedHat Linux with kernel version 2.2.14-5.0smp (the version which ships with RedHat 6.2). We have discovered that occasional errors in floating point calculations, resulting in a NaN, can occur in random way when using this kernel. Upgrading to 2.2.14-12smp fixes the problem. The problem may be related to occasional system crashes on heavily loaded systems running this version of the kernel reported on the RedHat website. I would strongly suggest that anyone using 2.2.14-5.0smp upgrades to 2.2.14-12smp. If you are running RedHat 6.2, and have not made any updates, you will be using 2.2.14-5.0. If you have anymore questions about this, feel free to email me. -- ************************************************ David F. Green Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Ave., Rm. 6-133 Cambridge, MA 02139, USA E-mail: dfgreen@lms.mit.edu Phone: (617) 258-6229 Fax: (617) 253-7030 ************************************************