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debug: 0.046
boot: 0.031
KVM: 0.024
debug: 0.693
network: 0.136
PID: 0.029
other: 0.023
performance: 0.022
device: 0.019
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[BUG][CPU hot-plug]CPU hot-plugs cause the qemu process to coredump

Hello,Recently, when I was developing CPU hot-plugs under the loongarch
architecture,
I found that there was a problem with qemu cpu hot-plugs under x86
architecture,
which caused the qemu process coredump when repeatedly inserting and
unplugging
the CPU when the TCG was accelerated.


The specific operation process is as follows:

1.Use the following command to start the virtual machine

qemu-system-x86_64 \
-machine q35  \
-cpu Broadwell-IBRS \
-smp 1,maxcpus=4,sockets=4,cores=1,threads=1 \
-m 4G \
-drive file=~/anolis-8.8.qcow2  \
-serial stdio   \
-monitor telnet:localhost:4498,server,nowait


2.Enter QEMU Monitor via telnet for repeated CPU insertion and unplugging

telnet 127.0.0.1 4498
(qemu) device_add
Broadwell-IBRS-x86_64-cpu,socket-id=1,core-id=0,thread-id=0,id=cpu1
(qemu) device_del cpu1
(qemu) device_add
Broadwell-IBRS-x86_64-cpu,socket-id=1,core-id=0,thread-id=0,id=cpu1
3.You will notice that the QEMU process has a coredump

# malloc(): unsorted double linked list corrupted
Aborted (core dumped)