On Fri, Feb 13, 2015 at 05:08:56PM -0500, John Snow wrote: > + def check_incremental(self, target=None): > + if target is None: > + target = self.bitmaps[-1].last_target() > + self.assertTrue(iotests.compare_images(self.test_img, target)) > + return True > + > + > + def hmp_io_writes(self, drive, patterns): > + for pattern in patterns: > + self.vm.hmp_qemu_io(drive, 'write -P%s %s %s' % pattern) > + self.vm.hmp_qemu_io(drive, 'flush')
Please don't read image files while the guest is still running. Image formats do not support concurrent readers and writers. Three options: 1. Stop the guest before accessing self.test_img 2. Use drive-backup to make a full copy of self.test_img that can be accessed. 3. Test specific patterns in the backup file instead of using compare_images (qemu-io -c 'read -P 0xff 0 512' img)
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