Take several CPUs offline and re-test. Even only 32 threads left, I still can reproduce this issue easily.
ubuntu@kreiken:~$ lscpu | grep list;for i in `seq 1 10`;do echo ;rm -f out.img;timeout 30 qemu-img convert -f qcow2 -O qcow2 ./bionic-server-cloudimg-arm64.img out.img -p; done On-line CPU(s) list: 0-31 Off-line CPU(s) list: 32-127
(100.00/100%)
(43.20/100%) (0.00/100%) (1.00/100%)
Take several CPUs offline and re-test. Even only 32 threads left, I still can reproduce this issue easily.
ubuntu@kreiken:~$ lscpu | grep list;for i in `seq 1 10`;do echo ;rm -f out.img;timeout 30 qemu-img convert -f qcow2 -O qcow2 ./bionic- server- cloudimg- arm64.img out.img -p; done
On-line CPU(s) list: 0-31
Off-line CPU(s) list: 32-127
(100.00/100%)
(43.20/100%)
(0.00/100%)
(1.00/100%)