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Bug#523942: linux-image-2.6.26-2-s390 will not boot!



STEPHEN POWELL wrote:
> My problem, on the other hand, has always been that the kernel hangs
> right before the permanent root file system gets mounted. I've always
> been able to get that far but no farther. For me, the key is that the
> s390x kernel works flawlessly, but the s390 kernel hangs.

Please give it a try anyway. If you look at the mail threads on lkml that 
are referenced from the BR you'll see that this bug resulted in different 
hangs at different points with both 2.6.27 and 2.6.29 [1] in the Hercules 
emulator. Bisection pointed to different, completely unrelated changes 
that somehow triggered the bug even though those changes in themselves 
were completely correct. The hangs on Hercules were rather unpredictable 
as 2.6.26, which also has the bug, worked reliably.

I don't think it really matters if it's emulator or real hardware. The 
determining factor is what type of system it is.

The bug itself is a rounding error in fairly core s390-specific (31 bit) 
code, so the fact that s390x does not hang actually increases the chance 
that this is related. Where exactly the bug manifests itself varies, but 
when it does it's been completely reproducible and the result in each 
case was an endless loop: a hang.

I'm not saying this definitely is the cause, but it looks similar enough 
to me that it's worth giving the patch a try.

I agree that the remaining Flex-ES issue is completely unrelated.

[1] With 2.6.29 I could get as far as the login prompt, but actually 
logging in would trigger the hang.



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