Frank Solensky wrote:
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?
Yes, it's obsolete. Please file a PR to remove the outdated advice.
Unfortunately in FreeBSD 5 and later there is no way to dump prior to
multi-user startup, because of how device discovery is now dynamic. You
can still use other tools like ddb/remote gdb etc.
Kris
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