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

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Date:	Sun, 4 Oct 2009 16:43:20 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #14270] Cannot boot on a PIII Celeron

[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
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