Date: Wed, 18 May 2005 06:43:37 -0600 From: "Elliot Finley" <efinleywork@efinley.com> To: "Peter Jeremy" <peterjeremy@optushome.com.au> Cc: sos@freebsd.org Subject: Re: 5.4-RC2 freezing - ATA related? Message-ID: <042501c55ba7$360fac30$37cba1cd@emerytelcom.com> References: <001801c55a14$609720d0$37cba1cd@emerytelcom.com> <20050516195859.GA59189@server.vk2pj.dyndns.org>
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> On Mon, May 16, 2005 at 06:40:01AM -0600, Elliot Finley wrote: > >The system freezes, but isn't totally dead. It'll still respond to pings, > >the screensaver still functions, but it won't respond to a CAD at the > >console. But if I press 'Enter' at the console, it'll give me a 'login:' > >prompt, but after entering the username, it never comes back with the > >'password:' prompt. > ... > >On my lightly loaded systems, it happens rarely. On my mailserver (fairly > >heavy disk load), it happens quite frequently. > > This could equally be a filesystem deadlock (race-to-root) rather than > something in the ATA controller. Do you know if it happens gradually > (starts with one or two non-responsive, unkillable processes and gets > worse until nothing happens)? > > >How can I troubleshoot this? > > Re-compile the kernel with: > options KDB > options DDB > makeoptions DEBUG=-g > and ensure you have a "dumpdev" in /etc/rc.conf. When you get a > lockup, drop to DDB (Ctrl-Alt-ESC) and run "show lockedvnods", "ps" > and "call doadump()". If you post the output (a serial console will > help here) someone might be able to provide more pointers. (The > crashdump will help with later debugging). Had the system lock up again. This is with the new ATA mkIII patches on http://people.freebsd.org/~sos/ATA. I didn't get the crashdump (forgot to set dumpdev), but I did get 'ps' and 'show lockedvnods' output from DDB. The output is in the form of screenshots combined into a single .pdf which can be accessed here http://www.efinley.com/Binder1.pdf I hope this is helpful, I'll get a crashdump next time (probably tomorrow morning). Elliot
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