[Bug 202643] x11/xorg: illegal instruction starting xorg in FreeBSD 10.2 in kvm/qemu virtulization

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202643

--- Comment #18 from Dimitry Andric <dim at FreeBSD.org> ---
(In reply to nogcjx from comment #16)
> I can run FreeBSD 10.1 in the same KVM/qemu setup that fails when I try to
> run 10.2.  I install the VM with scripts, so the setup options are the same.
> Something changed, but what changed I don't know.  I am running virtualized
> 10.1 right now.

Maybe you were just lucky, as it *does* crash for me on FreeBSD 10.1-RELEASE. 
I started both 10.1-RELEASE and 10.2-RELEASE instances on KVM, installed all of
xorg with pkg (from the 'latest' pkg repo), and started /usr/local/bin/Xorg on
them.  Both crash with:

Program received signal SIGILL, Illegal instruction.
[Switching to Thread 803406400 (LWP 100054/Xorg)]
0x00000000004a40d0 in xf86SlowBcopy ()
(gdb) bt
#0  0x00000000004a40d0 in xf86SlowBcopy ()
#1  0x0000000802dd2b99 in VESASaveRestore () from
/usr/local/lib/xorg/modules/drivers/vesa_drv.so
#2  0x0000000802dd1e27 in VESAScreenInit () from
/usr/local/lib/xorg/modules/drivers/vesa_drv.so
#3  0x0000000000439ec0 in AddScreen ()
#4  0x000000000047e104 in InitOutput ()
#5  0x0000000000429056 in _start ()
#6  0x0000000000428d4f in _start ()
#7  0x0000000800814000 in ?? ()
#8  0x0000000000000000 in ?? ()

I'll see if it gives a little more information to rebuild these with debug
info.

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