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Ticket Resolution Summary Owner Reporter
#8927 obsolete saved state CentOS5.6 get frozen after Update to VB4.0.8 and resuming maninred2
Description

saved state CentOS5.6 get frozen after Update to VB4.0.8 and resuming. Thats all.

#8928 obsolete Guru Meditation when accessing RAM (through mapping) @ 0xB8000 Markus Duft
Description

Hi!

I'm writing a little hobby kernel (sources @ [1]), and now try to run it on virtualbox. it works fine on qemu, bochs and real hardware. The kernel is a x86_64 kernel. It runs perfectly on VirtualBox, with one little exception: if i try to do something on the screen, a guru meditation results (log attached).

The code causing the crash maps the VGA memory 0xB8000 to a virtual memory location (which succeeds), and then tries to write to the buffer (which crashes).

as i said, this works on qemu, bochs and real hardware, only vbox crashes. is this a limitation i should be aware of?

i'll attach:

  • the log for the meditation.
  • a cd image containing the kernel booted by grub2.

[1] https://github.com/mduft/tachyon3/blob/master/src/x86/cga.c

#8933 obsolete VB-4.0.8 crash with minidump simon marshall
Description

I noticed Windows' Action Center griping about a problem that turned out to be a VB crash from this morning.

This may or may not be related to http://www.virtualbox.org/ticket/8932, though it's worth noting I could still reproduce that problem following a host reboot (which this VB crash pre-dates).

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