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 (Cipher TLSv1:DES-CBC3-SHA:168) (Exim 3.31-VA-mm2 #1 (Debian)) id 1AMYrU-0006Zc-00 for ; Wed, 19 Nov 2003 12:23:40 -0800 Received: from 41-052.adsl.zetnet.co.uk ([194.247.41.52] helo=mail.esperi.org.uk ident=0) by sc8-sf-mx2.sourceforge.net with esmtp (Exim 4.24) id 1AMYrT-0001Mv-UH for user-mode-linux-devel@lists.sourceforge.net; Wed, 19 Nov 2003 12:23:40 -0800 Received: from esperi.org.uk (1000@amaterasu.srvr.nix [192.168.14.14]) by mail.esperi.org.uk (8.12.10/8.12.10) with ESMTP id hAJKNVth001479 for ; Wed, 19 Nov 2003 20:23:31 GMT From: Nix Message-ID: <877k1w85vh.fsf@amaterasu.srvr.nix> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Subject: [uml-devel] skas3-related crash of the week Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: Date: Wed, 19 Nov 2003 20:23:30 +0000 To: user-mode-linux-devel@lists.sourceforge.net Using unmodified 2.4.22-6. sshed in through the firewall on the UML instance, with tty logging enabled: typing exit on the last sshed-in console froze the box yielded this on the console before UML died: Kernel panic: switch_mm_skas - PTRACE_SWITCH_MM failed, errno = 9 Kernel panic: switch_mm_skas - PTRACE_SWITCH_MM failed, errno = 9 Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: switch_mm_skas - PTRACE_SWITCH_MM failed, errno = 9 Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: Kernel mode fault at addr 0x4, ip 0x400e64ce Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm Kernel panic: Segfault with no mm In idle task - not syncing <0>Kernel panic: Segfault with no mm In idle task - not syncing EBADF is a rather odd error to get from ptrace(): I wonder if this has the same root cause as the EMFILE error I got a couple of weeks ago? It looks like the error came from proc_mm_get_mm(), so something like running out of fhs might explain it. Whatever it is, it's pretty persistent: it looks like it panic-kills every process in turn until it runs out. As before, post-crash the box isn't remotely close to running out of fhs: 1437 208 8192 (Now that the instance has crashed, I have an excuse to rebuild it with debugging turned on, so the next report like this should have backtraces.) -- `Me, I want exploding spaceships and pulverized worlds and clashes of billion-year-old empires *and* competently written sentences.' --- Matt Austern ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel