vagrant box defines more cpus than available on host!
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robertocabellon commented
after vagrant up executed the vagranfile creates the virtual machine with 4 cpus, but I only have 2 available.
Then linux never boots up. It hangs, looping the following message:
sd 2:0:0:0 rejecting I/O to offline device
I fixed this by forcing through the VagrantFile to use 2 cpus.
then i found this looking for information about the problem...
it seems tha nproc counts for physical and virtual cores.. and vbox only counts for physical..
hashbangcode/vlad#350