Hi Stefan,

When I start a Virtual Machine, during the guest's boot, IPIs are sent
and received correctly between CPUs, but after a few seconds I get:
     spin lock 0xffffffff8164c290 (smp rendezvous) held by
0xfffff8000296c000 (tid 100009) too long
     panic: spin lock held too long

Is this on a lightly loaded machine ? I've not looked at your diff in detail but it's possibly a code path where a spinlock wasn't unlocked, leaving another CPU spinning.



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