Re: [Linux-ia64] [PATCH] Fix for the X->text->X console crash

David Mosberger
2001-10-29T15:57:27Z

>>>>> On Fri, 26 Oct 2001 10:17:15 -0700, Chris Ahna <christopher.j.ahna@intel.com> said:

Chris> A patch which should fix the famous X->text->X console switch
Chris> crashes is appended.

This is excellent news. Great job!

Chris> It seems that the kernel was sending a 'console reacquired'
Chris> signal to X _before_ doing a screen blank operation. This
Chris> allowed X to be configuring the video card from one processor
Chris> while the kernel cleared parts of the VGA range from another.
Chris> Interleaving these types of accesses apparently caused the
Chris> system crashes (at least that's what the hardware guys with
Chris> PCI bus analyzers saw and the problem goes away when running
Chris> UP :-)

Argh, a generic kernel race condition. Who would have thought of that.

Any idea why this is crashing on ia64 but not on MP x86s?

In any case, it sounds like we can finally take this bug off the list.
I'm sure lots of people will appreciate this.

Thanks,

--david