[Bug 279738] Hyper-V: Kernel panic: acquiring blockable sleep lock with spinlock or critical section held

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279738

--- Comment #5 from Wei Hu <weh@microsoft.com> ---
This is due to calling contigmalloc() from smp_rendezvous(). Even passing the
M_NOWAIT flag, on smaller memory sized VM it still reach vmem_xalloc in the
path and tries to grab sleep lock by calling VMEM_LOCK(vm). 

I will try to move the contigmalloc call out of smp_rendezvous.

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