Messages in this thread | | | Date | Fri, 14 Nov 2003 13:47:55 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: 2.6.0-test9-mm3 |
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On Fri, 14 Nov 2003, Martin J. Bligh wrote: > > Linus had some debug thing for triple faults, a few months ago, IIRC ... > probably in the archives somewhere ...
Triple faults you can't debug, they raise a line outside the CPU, and normal PC hardware will cause that to just trigger a reboot.
But double faults do get caught, and that debugging stuff actually is in the standard kernel. It won't give _nearly_ as good a debug report as a "normal" oops, since I didn't want the double-fault handler to touch anything even remotely unsafe, but it often gives a good hint about what might be wrong. Certainly better than triple-faulting did (which we still do for _catastrophic_ corruption, eg totally munged kernel page tables etc - it's just very hard to avoid once you get corrupted enough).
Linus
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