Re: [Bug #14270] Cannot boot on a PIII Celeron

Cyrill Gorcunov
2009-10-04T12:44:00Z

[Michael Tokarev - Sun, Oct 04, 2009 at 04:14:44PM +0400]
...
>>
>> I switched to BZIP2, it booted fine. I switched back to LZMA -
>> and that one now boots too. Original bzImage, which were built
>> by the same compiler from the same source using the same
>> options reboots.
>>
>> So um... I'm now trying to reproduce it ;)
>
> I performed about 20 kernel recompiles, and finally have some "statistics".
> The problem is almost reproduceable, in a sense that I was able to get 6
> more cases behaving the same way (rebooting right at early boot on a cel).
> And all 3 "non-working" cases were with ccache. Ie, about half out of ~25
> compiles done with ccache, and 7 of the resulting kernels are buggy. No
> single failure without ccache so far.
>
> Maybe it's some stale .o file cached by ccache (and it indeed looks like
> that) -- I didn't try to remove the cache yet (but my guess is that I
> wont be able to reproduce the issue with clean cache anymore).
>
> What puzzles me most is the "failure mode". The difference between the
> two processors is minimal. Having a corrupt .o file and almost-working
> kernel is almost impossible by its own. And hitting this difference with
> a corrupt .o file is.. unbelievable.
>
> So I'm declaring it's a false alarm for now, and closing the bug.

ok, thanks for hard work on this Michael!

>
> /mjt
>
-- Cyrill