Re: RHEL7 hang (and probably mainline) while copying big files because of subrequests merging(?)

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> On Jul 11, 2016, at 9:47 AM, Alexey Dobriyan <adobriyan@xxxxxxxxx> wrote:
> 
> On Mon, Jul 11, 2016 at 4:28 PM, Trond Myklebust
> <trondmy@xxxxxxxxxxxxxxx> wrote:
>> 
>>> On Jul 11, 2016, at 08:59, Alexey Dobriyan <adobriyan@xxxxxxxxx> wrote:
>>> 
>>> We have a customer who was able to reliably reproduce the following hang:
>>> (hang itself is rare but there are many machines, so it is not rare)
>>> 
>>> INFO: task ascp:66692 blocked for more than 120 seconds.
>> 
>> Why is this being reported here and not to Red Hat? Is the bug reproducible on the upstream kernel?
> 
> It is not a report per se, more heads up for other folks like CentOS
> and other rebuilders.
> I checked every NFS commit since 3.10, there seems to be nothing fixing it.
> As for testing mainline, I don't know, maybe we can arrange that.
> 
>   Alexey
> 

How have you checked every commit since 3.10 and not tested "mainline"?

I don't get how both can be true. Do you mean you manually inspected each
commit? I'm not sure the fix would be so obvious...

-dros

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