[Bug 194112] New: [panic] Fatal trap 12: Page fault while in vm86 mode with kern.vty=vt console and hw.vga.textmode=1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194112

            Bug ID: 194112
           Summary: [panic] Fatal trap 12: Page fault while in vm86 mode
                    with kern.vty=vt console and hw.vga.textmode=1
           Product: Base System
           Version: 10.1-BETA3
          Hardware: i386
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: info at juanmolina.eu

I’m getting a consistent panic with a NVIDIA GeForce FX 5600 XT (NV31) AGP card
when enabling both kern.vty=vt and hw.vga.textmode=1 in /boot/loader.conf.
FreeBSD 10.1-BETA3.

I wanted to test the VT console, enabled kern.vty=vt, but the graphics mode was
unusable due to the buffer being drawn out of the screen (that’s another
problem). I then added hw.vga.textmode=1 and kernel panicked.

Unfortunately, I’m not getting any core dumps despite having dumpdev="AUTO" in
/etc/rc.conf and a 3 GB swap device enabled (actual memory is 1.5 GB). I’ve not
found any erros related to savecore.

Here is some relevant text, copied by hand, from the panic:

vga0: <VGA GENERIC ISA VGA> ...

Fatal trap 12: Page fault while in vm86 mode
...
fault code: user read, page not present
...

I’m willing to test further if any developer is interested.

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