Re: [Qemu-block] Broken aarch64 by qcow2: skip writing zero buffers to empty COW areas [v2]

[Lukáš Doktor]

Dne 21. 08. 19 v 19:51 Max Reitz napsal(a):
> On 21.08.19 16:14, Lukáš Doktor wrote:
>> Hello guys,
>>
>> First attempt was rejected due to zip attachment, let's try it again with 
>> just Avocado-vt debug.log and serial console log files attached.
>>
>> I bisected a regression on aarch64 all the way to this commit: "qcow2: skip 
>> writing zero buffers to empty COW areas" 
>> c8bb23cbdbe32f5c326365e0a82e1b0e68cdcd8a. Would you please have a look at it?
> 
> I think I can see the issue on my x64 system (I don’t see the XFS
> corruption, but the installation fails because of some segfaults).
> 
> I haven’t found a simpler way to reproduce the problem yet, though,
> which is a pain... :-/
> 
> It looks like the problem disappears when I configure qemu with
> “--disable-xfsctl”.  Can you try that?
> 
> Max
> 

Hello Max,

yes, I'm getting the same behavior. With "--disable-xfsctl" it works well. Also 
looking at the option I understand why it only failed on aarch64 for me, I 
don't have libs installed on the other machines, therefor it was disabled by 
"./configure" there. Anyway I guess disabling it in my builds won't really fix 
the issue, right? :-)

Regards,
Lukáš

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