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%)
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https://bugs.launchpad.net/bugs/1805256
Title:
qemu-img hangs on rcu_call_ready_event logic in Aarch64 when
converting images
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