[Bug 198675] Kernel crash after gdb> reboot (No boot partition) Need to do a hard reboot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198675

            Bug ID: 198675
           Summary: Kernel crash after gdb> reboot (No boot partition)
                    Need to do a hard reboot
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ben at acustat.org

Created attachment 154469
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=154469&action=edit
uname - messages log - dmesg

When I start Xorg with startx, I while I wait for previous programs to start I
get a crash.  Been happening for a few builds now. (Randomly happens, About
once every two weeks using laptop 10 out of 14 days).

After crash Xorg will exit out and I will be at gdb prompted.  I'm not a c
programmer so I'm not sure about debugging with gdb.  I simply type "reboot". 
On reboot laptop has not boot partition.  I have to do a hard reset with the
power button for the laptop to come back on.

I have attached my logs:
 uname -a
 /var/log/messages (with gdb syscall)
 dmesg (right after hard reset is done)

Let me know if you want me to try a diff or new kernel build.
If someone has some gdb command I should run next time let me know.

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