Messages in this thread |  | | From | Paolo Bonzini <> | Subject | Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal() | Date | Fri, 16 Jul 2021 13:55:27 +0200 |
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On 16/07/21 11:37, Hillf Danton wrote: > On Fri, 16 Jul 2021 09:59:15 +0200 Paolo Bonzini wrote: >> * the warning only occurs if preemption occurs during the >> spin_lock_irqsave critical section (and therefore it can only occur in >> PREEMPT_RT kernels) > > With that lock held, no waitqueue entry can be added on to the WQ - IOW no > wakeup will go stray. > >> * the warning causes an early return 0 that messes up the VM's networking > > Is the messup due to the zero or wakeup?
It's caused by the missing wakeup, i.e. eventfd_signal not really signaling anything.
Paolo
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