Package: qemu-guest-agent Version: 1:10.0.2+ds-1 Dear qemu maintainer(s),
it seems the qemu-guest-agent package (at least the one shipped in Debian trixie) contains a logic bug that can prevent a suspend-to-mem or suspend-to-disk command from executing. The VM in question is a freshly installed Debian trixie guest with qemu-guest-agent version 1:10.0.2+ds-1 installed. What I did ---------- I called "virsh dompmsuspend <vm-name> --target disk" on the hypervisor. What I expected to happen ------------------------- guest suspends to disk What actually happened ---------------------- guest did not suspend, and instead I got this error output: error: Domain '<vm-name>' could not be suspended error: guest agent command failed: unable to execute QEMU agent command 'guest-suspend-disk': suspend: cannot write to '/sys/power/state': Failed to create file “/sys/power/state.36DK82”: Permission denied Suggested Fix/Workaround ------------------------ I believe the actual write attempt is performed in this location: qga/commands-linux.c at line 1412 [1]. It is possible the g_file_set_contents() function internally tries to create a temporary file in the same folder as the target file, probably to prevent losing the original file contents in case of any error during write. I suggest changing this to a plain old fopen() -> fwrite() -> fclose() call sequence since there is no danger of data loss on sysfs writes. Thank you for your time, - Danny Edel [1]: https://sources.debian.org/src/qemu/1:10.0.2+ds-1/qga/commands-linux.c/?hl=1412#L1412
