I found the commit that introduced this regression.
commit 57830a499f7c815bb0cb325c94a3d8c910d13cfa (HEAD)
Author: Denis Plotnikov
Date: Fri Feb 15 16:03:25 2019 +0300
block: don't set the same context
Adds a fast path on aio context setting preventing
unnecessary context setting
Upstream qemu-v3.1.0 pass
Upstream qemu-v3.1.1 pass
Upstream qemu-v4.0.0 fail
Upstream qemu-v4.0.0-rc0 fail
So the problem occurs due to patch between qemu-v3.1.1 to
qemu-v4.0.0-rc0.
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Public bug reported:
commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4,
origin/master, origin/HEAD, master)
Test arch:x86 and power
Steps:
1.Boot up guest with command
power cmdline:
/usr/libexec/backup/qemu-kvm \
-smp 8 \
-m 4096 \
-nodefaults \
-device
