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M. Vefa Bicakci:
> Hello all,
> 
> I noticed that the following commit causes a regression in QubesOS when
> a VM's network interface is detached and re-attached a few times in a row:
> 
>   5b5971df3bc2775107ddad164018a8a8db633b81
>   ("xen-netfront: remove warning when unloading module")
> 
> The regression exhibits itself via VM unresponsiveness to qrexec commands
> and heavier than usual CPU utilization involving the xenbus and xenwatch
> kernel threads in the VM whose network interface had been 
> detached/re-attached.
> 
> This commit has been back-ported to the kernel trees for versions 4.9.80 and
> 4.14.17, which is why QubesOS's testing kernel (based on 4.14.18) is also
> affected.

Thanks, for tracking this down! And sorry that I missed your report
until now (Otherwise I would already have included it in the latest
kernel PR).

> I am currently using QubesOS R3.2, but I believe this issue affects R4.0 as 
> well.

I'm observing this behavior on R4.0.

Will try if reverting fixes the problem for me.

> Reverting this commit appears to resolve the regression for the time being. I
> haven't had the time to formulate a proper correction.

Did you find out yet why this change is broken?
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