[OE-core] Need arm64/qemu help

[Ian Arkver]

On 03/03/18 09:00, Richard Purdie wrote:
> Hi,
> 
> I need some help with a problem we keep seeing:
> 
> https://autobuilder.yocto.io/builders/nightly-arm64/builds/798
> 
> Basically, now and again, for reasons we don't understand, all the
> sanity tests fail for qemuarm64.
> 
> I've poked at this a bit and if I go in onto the failed machine and run
> this again, they work, using the same image, kernel and qemu binaries.
> We've seen this on two different autobuilder infrastructure on varying
> host OSs. They always seem to fail all three at once.
> 
> Whilst this was a mut build, I saw this repeat three builds in a row on
> the new autobuilder we're setting up with master.
> 
> The kernels always seem to hang somewhere around the:
> 
> | [    0.766079] raid6: int64x1  xor()   302 MB/s
> | [    0.844597] raid6: int64x2  gen()   675 MB/s

I believe this is related to btrfs and comes from having btrfs compiled 
in to the kernel. You could maybe side-step the problem (and hence leave 
it lurking) by changing btrfs to a module.

Regards,
Ian

> raid timing measurements.
> 
> In the past we've dived in and handled these kinds of things but I've
> run out of people to lean on and I need help from the wider community.
> 
> Can anyone help look into and fix this?
> 
> This is serious as if nobody cares, I'll have to simply stop boot
> testing qemuarm64.
> 
> Not sure if there is an open bug yet either :/.
> 
> Cheers,
> 
> Richard
>