ruby 2.6.0 oops+crash when accessing /dev/tty18

[Helge H. <hel...@ai...>]

I have two framebuffers and fbcon, and ruby 2.6.0
vc 1-16 on fb0 seems to work fine.

I tried "echo testing > /dev/tty18" to see if
I got something on fb1.

This crashed. Many pages of oops scrolled by, ending in:

handle_IRQ_event
do_IRQ
common_interrupt
do_page_fault
error_code
mm_release
del_timer_sync
do_exit
do_page_fault
do_divide_error
do_page_fault
common_interrupt
handle_IRQ_event
cascade
run_timer_softirq
do_page_fault
error_code
mm_release

EIP at mm_release


This is a dual cpu machine with a matrox G550.
matroxfb and fbcon is compiled in.

Helge Hafting