device: 0.948 graphic: 0.936 socket: 0.895 semantic: 0.865 network: 0.813 permissions: 0.676 vnc: 0.669 KVM: 0.655 files: 0.652 PID: 0.651 other: 0.563 performance: 0.549 debug: 0.485 boot: 0.474 commit: 4fe6d78 "virtio: postpone the execution of event_notifier_cleanup function" will cause vhost-user device crash The new commit: 4fe6d78 break the existing vhost-user devices, such as vhost-user-scsi/blk and vhost-vsocks when exit the host driver, kvm_io_ioeventfd_del will hit the abort(). Thanks for the bug report. Patch has now been reverted: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=1ef8185a0613dd2ed2