Date: Thu, 20 May 2004 08:59:58 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Nick Strebkov <nick@humgat.org> Cc: hackers@freebsd.org Subject: Re: obtaining a kernel crash dump Message-ID: <16556.43982.226708.375607@grasshopper.cs.duke.edu> In-Reply-To: <20040519133442.GA90053@nord.interexc.com> References: <20040519133442.GA90053@nord.interexc.com>
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Nick Strebkov writes: > May 19 16:17:00 devel /kernel: > May 19 16:17:00 devel /kernel: syncing disks... 60 3 2 > > [dd boot kernel messages] Try disabling sync-on-panic. It almost always causes problems for me when trying to get dumps. % cat /etc/sysctl.conf kern.sync_on_panic=0 If you are running a newer version of FreeBSD with the DDB_TRACE options, you want to enable DDB and DDB_TRACE. This will get you a stack trace on console, which is a heck of a lot better than nothing if your crashdumps don't work. options DDB #Enable the kernel debugger options DDB_TRACE Sometimes I have problems getting a dump on 5.x if I've dropped into ddb, so I use the following to prevent the system from dropping to a DDB prompt at panic: options DDB_UNATTENDED Drew
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