Date: Tue, 25 Nov 2008 12:44:14 -0500 From: Frank Solensky <frank@solensky.org> To: freebsd-questions <freebsd-questions@freebsd.org> Subject: Kernel crash before dumpon Message-ID: <1227635054.6253.16.camel@frank-laptop>
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I'm trying to get a dump off a machine with a 7.1-beta2 kernel that's been crashing during the boot process, following the instructions on http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html#KERNELDEBUG-OBTAIN I've recompiled the kernel with "-g" but no vmcore file appears so I'm assuming that the crash occurs before dumpon is executed. The page includes the following suggestion on how I might be able to proceed: Alternatively, the dump device can be hard-coded via the dump clause in the config(5) line of a kernel configuration file. This approach is deprecated and should be used only if a kernel is crashing before dumpon(8) can be executed. I tried adding config dump "/dev/ad4s3b" to the configuration file but that option appears to be no longer supported: the config command gives an error message of: root/dump/swap specification obsolete Is the paragraph above obsolete? If so, what's the preferred way to collect the dump? Thanks
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