Created attachment 870610 [details]
Script to reproduce relative pathname bug with just qemu-kvm and qemu-img

Attached is a script to reproduce this bug with just qemu-kvm, and qemu-img.

This can be seen via either live snapshots, or image creation with qemu-img.

This script will do the following:

1) create test directory
2) create a qcow2 base image
3) launch qemu-kvm with qmp over localhost tcp
4) attempt to create 80 live snapshots with a relative pathname, to parent directory and then back into the test directory
5) run qemu-img, create a different set of 80 snapshots off the same base image.
6) kill the process started in step #3

All you should need to edit in the script is the executable path for qemu and qemu-img.

The test directory is left after the script runs, with the created snapshots and an output log, for later examination.

Expected outcome:
Post fix:  All snapshot created successfully (live and via qemu-img)
Prior to fix:  First ~24 snapshots succeed, those after that fail


If you edit the script to create 150 snapshots instead of 80, you will see the fix fail as well.

Fix included in qemu-kvm-1.5.3-51.el7

Verified on qemu-kvm-rhev-1.5.3-55.el7.x86_64:

Run script in comment 3, all 80 snapshots created successfully with both live snapshot and qemu-img.

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.