Suspected regression?

[Christophe Leroy]

Le 19/07/2016 à 23:52, Scott Wood a écrit :
> On Tue, 2016-07-19 at 12:00 +0200, Alessio Igor Bogani wrote:
>> Hi all,
>>
>> I have got two boards MVME5100 (MPC7410 cpu) and MVME7100 (MPC8641D
>> cpu) for which I use the same cross-compiler (ppc7400).
>>
>> I tested these against kernel HEAD to found that these don't boot
>> anymore (PID 1 crash).
>>
>> Bisecting results in first offending commit:
>> 7aef4136566b0539a1a98391181e188905e33401
>>
>> Removing it from HEAD make boards boot properly again.
>>
>> A third system based on P2010 isn't affected at all.
>>
>> Is it a regression or I have made something wrong?
>
> I booted both my next branch, and Linus's master on MPC8641HPCN and didn't see
> this -- though possibly your RFS is doing something different.  Maybe that's
> the difference with P2010 as well.
>
> Is there any way you can debug the cause of the crash?  Or send me a minimal
> RFS that demonstrates the problem (ideally with debug symbols on the userspace
> binaries)?
>

I got from Alessio the below information:

systemd[1]: Caught <BUS>, core dump failed (child 137, code=killed,
status=7/BUS).
systemd[1]: Freezing execution.


What can generate SIGBUS ?
And shouldn't we also get some KERN_ERR trace, something like "unhandled 
signal 7 at ....." ?

Christophe