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DescriptionDmitry Konishchev
2014-01-30 09:17:44 UTC
Created attachment 857406[details]
QMP socket breaking script
Description of problem:
If you connect to QMP socket and immediately close it there is a big change to break QMP socket and get hung QEMU process consuming CPU on 100%.
Version-Release number of selected component:
qemu-kvm-0.12.1.2-2.415.el6_5.3.x86_64
Steps to Reproduce:
1. Run QEMU:
# /usr/libexec/qemu-kvm -qmp unix:/tmp/qmp,server,nowait
2. Run the attached script (specify path to qemu-kvm sources to include provided example of Python qmp module):
# python break_qmp.py PATH/TO/QEMU/SOURCES /tmp/qmp
You will get the following output (after one or several connects using socket you will hand on connection to QMP socket):
> Connecting to QMP...
> OK
> Connecting using socket...
> OK
> Connecting to QMP...
QEMU will burn the CPU.
Additional info:
qemu-kvm-0.12.1.2-2.355.el6_4.9:2.x86_64 doesn't have this bug.
Comment 2Dmitry Konishchev
2014-02-25 10:52:35 UTC