Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal()

From: Paolo Bonzini
Date: Fri Jul 16 2021 - 02:55:10 EST

On 16/07/21 04:06, Hillf Danton wrote:
With the patch:
- no warn
- continue using the VM normally...
Well with the patch applied, the VM works fine without the stuff protected
by the spin_lock_irqsave(), then without the patch why simply printing a
warning makes the VM dumb, given the warning is there actually also preventing
you from touching the lock.

If the warning is triggered, eventfd_signal will not do the wakeup.