Issue

What were you trying to do that didn't work? repeatedly hotplug/unplug SCSI disk, qemu crash qemu-kvm: ../block/block-backend.c:2429: AioContext *blk_get_aio_context(BlockBackend *): Assertion `ctx == blk->ctx' failed. Please provide the package NVR for which bug is seen: Red Hat Enterprise Linux release 9.4 Beta (Plow) 5.14.0-416.el9.x86_64 qemu-kvm-8.2.0-4.el9.x86_64 seabios-bin-1.16.3-2.el9.noarch edk2-ovmf-20231122-4.el9.noarch How reproducible: 30% Steps to reproduce 1. Boot VM /usr/libexec/qemu-kvm \ -name 'avocado-vt-vm1' \ -sandbox on \ -machine pc,memory-backend=mem-machine_mem \ -nodefaults \ -device '{"driver": "VGA", "bus": "pci.0", "addr": "0x2"}' \ -m 12288 \ -object '{"size": 12884901888, "id": "mem-machine_mem", "qom-type": "memory-backend-ram"}' \ -smp 48,maxcpus=48,cores=24,threads=1,dies=1,sockets=2 \ -cpu 'Icelake-Server-noTSX',+kvm_pv_unhalt \ \ -device '{"driver": "ich9-usb-ehci1", "id": "usb1", "addr": "0x1d.0x7", "multifunction": true, "bus": "pci.0"}' \ -device '{"driver": "ich9-usb-uhci1", "id": "usb1.0", "multifunction": true, "masterbus": "usb1.0", "addr": "0x1d.0x0", "firstport": 0, "bus": "pci.0"}' \ -device '{"driver": "ich9-usb-uhci2", "id": "usb1.1", "multifunction": true, "masterbus": "usb1.0", "addr": "0x1d.0x2", "firstport": 2, "bus": "pci.0"}' \ -device '{"driver": "ich9-usb-uhci3", "id": "usb1.2", "multifunction": true, "masterbus": "usb1.0", "addr": "0x1d.0x4", "firstport": 4, "bus": "pci.0"}' \ -device '{"driver": "usb-tablet", "id": "usb-tablet1", "bus": "usb1.0", "port": "1"}' \ -object '{"qom-type": "iothread", "id": "iothread0"}' \ -object '{"qom-type": "iothread", "id": "iothread1"}' \ -device '{"id": "virtio_scsi_pci0", "driver": "virtio-scsi-pci", "bus": "pci.0", "addr": "0x3", "iothread": "iothread0"}' \ -blockdev '{"node-name": "file_image1", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/rhel940-64-virtio-scsi.qcow2", "cache": {"direct": true, "no-flush": false}}' \ -blockdev '{"node-name": "drive_image1", "driver": "qcow2", "read-only": false, "cache": {"direct": true, "no-flush": false}, "file": "file_image1"}' \ -device '{"driver": "scsi-hd", "id": "image1", "drive": "drive_image1", "write-cache": "on"}' \ -blockdev '{"node-name": "file_stg0", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/stg0.qcow2", "cache": {"direct": true, "no-flush": false}}' \ -blockdev '{"node-name": "drive_stg0", "driver": "qcow2", "read-only": false, "cache": {"direct": true, "no-flush": false}, "file": "file_stg0"}' \ -device '{"driver": "scsi-hd", "id": "stg0", "bus": "virtio_scsi_pci0.0", "drive": "drive_stg0", "write-cache": "on", "lun": 1}' \ -blockdev '{"node-name": "file_stg1", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/stg1.qcow2", "cache": {"direct": true, "no-flush": false}}' \ -blockdev '{"node-name": "drive_stg1", "driver": "qcow2", "read-only": false, "cache": {"direct": true, "no-flush": false}, "file": "file_stg1"}' \ -device '{"driver": "scsi-hd", "id": "stg1", "bus": "virtio_scsi_pci0.0", "drive": "drive_stg1", "write-cache": "on", "lun": 2}' \ -blockdev '{"node-name": "file_stg2", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/stg2.qcow2", "cache": {"direct": true, "no-flush": false}}' \ -blockdev '{"node-name": "drive_stg2", "driver": "qcow2", "read-only": false, "cache": {"direct": true, "no-flush": false}, "file": "file_stg2"}' \ -device '{"driver": "scsi-hd", "id": "stg2", "bus": "virtio_scsi_pci0.0", "drive": "drive_stg2", "write-cache": "on", "lun": 3}' \ -device '{"driver": "virtio-net-pci", "mac": "9a:70:f5:12:f4:23", "id": "idQeOME7", "netdev": "idhhqCth", "bus": "pci.0", "addr": "0x4"}' \ -netdev '{"id": "idhhqCth", "type": "tap", "vhost": true }' \ -vnc :0 \ -rtc base=utc,clock=host,driftfix=slew \ -boot menu=off,order=cdn,once=c,strict=off \ -enable-kvm 2.unplug disk {"execute": "device_del", "arguments": {"id": "stg1"}, "id": "09NK2PLp"} {"execute": "device_del", "arguments": {"id": "stg2"}, "id": "ptCk7lLv"} 3.hotplug disk {"execute": "device_add", "arguments": {"driver": "scsi-hd", "id": "stg1", "bus": "virtio_scsi_pci0.0", "drive": "drive_stg1", "write-cache": "on", "lun": 2}, "id": "Amk9O4wH"} {"execute": "device_add", "arguments": {"driver": "scsi-hd", "id": "stg2", "bus": "virtio_scsi_pci0.0", "drive": "drive_stg2", "write-cache": "on", "lun": 3}, "id": "wTkAmFXi"} 4.repeat step 2-3 3000 times Expected results guest may login Actual results qemu crash BT： #0  0x00007f80758a365c __pthread_kill_implementation (libc.so.6 + 0xa365c) #1  0x00007f8075854d06 raise (libc.so.6 + 0x54d06) #2  0x00007f80758287f3 abort (libc.so.6 + 0x287f3) #3  0x00007f807582871b __assert_fail_base.cold (libc.so.6 + 0x2871b) #4  0x00007f807584dca6 __assert_fail (libc.so.6 + 0x4dca6) #5  0x000055b1b429a831 scsi_device_for_each_req_async_bh.llvm.9308729181196144621 (qemu> #6  0x000055b1b47e6261 aio_bh_poll (qemu-kvm + 0xa2e261) #7  0x000055b1b47ca18e aio_poll (qemu-kvm + 0xa1218e) #8  0x000055b1b45b43c2 iothread_run (qemu-kvm + 0x7fc3c2) #9  0x000055b1b47ce76a qemu_thread_start.llvm.17470779946278888225 (qemu-kvm + 0xa1676a) #10 0x00007f80758a1912 start_thread (libc.so.6 + 0xa1912) #11 0x00007f807583f450 __clone3 (libc.so.6 + 0x3f450) It does not hit this issue on Red Hat Enterprise Linux release 9.4 Beta (Plow) 5.14.0-373.el9.x86_64 qemu-kvm-8.0.0-16.el9_3.x86_64 seabios-bin-1.16.1-1.el9.noarch edk2-ovmf-20230524-4.el9_3.noarch libvirt-9.5.0-7.el9_3.x86_64

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