[Bug 255386] FreeBSD 13 virtualbox guest reboot when trying to acces the mounted shared folder

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255386

--- Comment #8 from Guido Falsi <madpilot at FreeBSD.org> ---
To have the kernel save a core dump you need the machine (virtual or physical)
to have more swap than ram and configure it to perform the dump with
dumpdev="AUTO" in /etc/rc.conf.

A machine without any swap (which is a relatively common setup for virtual
machines) has no way to save a kernel core dump.

But to get actually useful data you should be running a debugging kernel.

I think, especially since we're talking about virtual machines, it would be
easier for you to install a VM with a snapshot of 14-CURRENT, that comes with
debugging kernel by default and see if the problem happens there, you should
then be dropped in the debugger an automatically get a backtrace that could
help investigating the issue. Use the "bt" debugger command to print it again
(the debugger should do that automatically)

Having a backtrace is no warranty of a resolution but would at least give an
idea to what part of the kernel to start looking at.

You should also configure enough swap so you can save a core dump that can be
analyzed later. To get that at the debugger prompt use the "save" command,
followed by "reboot".

You can get head snapshots from
https://download.freebsd.org/ftp/snapshots/amd64/amd64/ISO-IMAGES/14.0/

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