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MONITOR PANIC: Unable to decompress PPN from swap slot for VM

VMWARE ESXi 5.1U1

My VM would power off without apparent reason.
Looking in to the logs this error appears.

MONITOR PANIC: Unable to decompress PPN from swap slot for VM

I believe the underlying storage (a single SATA disk in my case) to be at fault, or almost dying I guess.
I storage vmotion’ed the VM to another disk.