id = 933
title = "Changing CD ROM medium sometimes fails with 'Tray of device is not open'"
state = "opened"
created_at = "2022-03-23T16:09:35.891Z"
closed_at = "n/a"
labels = ["Storage"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/933"
host-os = "Fedora-34/35/36, CentOS Stream 8/9"
host-arch = "x86"
qemu-version = "6.1.0 (but can be reproduced with v7.0.0-rc1 too!)"
guest-os = "Fedora 34"
guest-arch = "x86"
description = """QEMU reports that a CD ROM tray is not open when exchanging media:
`unable to execute QEMU command 'blockdev-remove-medium': Tray of device 'ide0-1-0' is not open`

We see the issue in upstream libvirt integration tests. However, this issue is a race and the reproducibility rate is <15%."""
reproduce = """On the high level this is what we do:
1. eject medium that the machine was started with
2. insert a different medium into the CD ROM

Translating the above to QEMU QMP commands this is what the test exercises:
1. blockdev-open-tray
2. blockdev-remove-medium
3. blockdev-del
4. blockdev-close-tray
5. blockdev-open-tray
6. blockdev-remove-medium
7. blockdev-add
8. blockdev-insert-medium <<< This is where the test fails
9. blockdev-close-tray"""
additional = """I bisected the code (3 times just to be sure since it's a race) and the following commit fell out of it:
55adb3c45620c31f29978f209e2a44a08d34e2da

I'm attaching QEMU trace events and a bunch of libvirt test logs (good and bad for comparison). If you think of anything else I should provide in order to help with the issue analysis, please let me know what other option should be turned on.[qemu_traces.tar.gz](/uploads/32e48c92efce3484e552df063795af4d/qemu_traces.tar.gz)"""