Red Hat bugzilla bug 1655408 against qemu is listed by Red Hat as fixed in April 2019, but I cannot find the corresponding change on qemu.org (the Changelog in the wiki is not a traditional changelog and doesn't cover bugfix releases such as 5.0.1, the git commit log is too detailed to search, the Red Hat bugzilla and security advisory pages do not link red hat bugs back to upstream (launchpad) bugs or git changes.
Here is the bug title (which also affects my Debian packaged qemu 5.0): VM can not boot up due to "Failed to lock byte 100" if cdrom has been mounted on the host Further observation: The basic problem is that qemu-system refuses to start with the error message "Failed to lock byte 100" when -drive points to a read-only ISO file. For the reporter of the Red Hat bug, that was a mount-induced read-only condition, in my case it is an NFS mount of a read-only directory. The error message itself seams meaningless, as there is no particular reason to request file locks on a read-only raw disk image. my qemu-system-x86_64 invocation contains the option (on one line): -drive if=none,id=drive-ide0-1-0,readonly=on, file=/mnt/someshare/path/gparted-live-1.1.0-5-amd64.iso,format=raw Enjoy Jakob -- Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10 This public discussion message is non-binding and may contain errors. WiseMo - Remote Service Management for PCs, Phones and Embedded
