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When the client is running in gdb and quit command is run in gdb, QEMU will still dispatch the event which will cause segment fault in the callback function. Signed-off-by: Coiby Xu <coiby.xu@gmail.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-id: 20200918080912.321299-3-coiby.xu@gmail.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>