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+
+4.1.0 bogus QCOW2 corruption reported after compress
+
+Creating a compressed image then running `qemu-img check <..>.qcow2' on said image seems to report bogus corruption in some (but not all) cases:
+
+Step 1.
+
+# qemu-img info win7-base.qcow2
+image: win7-base.qcow2
+file format: qcow2
+virtual size: 20 GiB (21474836480 bytes)
+disk size: 12.2 GiB
+cluster_size: 65536
+Format specific information:
+    compat: 1.1
+    lazy refcounts: true
+    refcount bits: 16
+    corrupt: false
+
+# qemu-img check win7-base.qcow2
+No errors were found on the image.
+327680/327680 = 100.00% allocated, 0.00% fragmented, 0.00% compressed clusters
+Image end offset: 21478375424
+
+Step 2.
+
+# qemu-img convert -f qcow2 -O qcow2 -c win7-base.qcow2 test1-z.qcow2
+
+Step 3.
+
+# qemu-img info test1-z.qcow2
+image: test1-z.qcow2
+file format: qcow2
+virtual size: 20 GiB (21474836480 bytes)
+disk size: 5.78 GiB
+cluster_size: 65536
+Format specific information:
+    compat: 1.1
+    lazy refcounts: false
+    refcount bits: 16
+    corrupt: false
+
+# qemu-img check test1-z.qcow2
+ERROR cluster 1191 refcount=1 reference=2
+ERROR cluster 1194 refcount=1 reference=4
+ERROR cluster 1195 refcount=1 reference=7
+ERROR cluster 1196 refcount=1 reference=7
+ERROR cluster 1197 refcount=1 reference=6
+ERROR cluster 1198 refcount=1 reference=4
+ERROR cluster 1199 refcount=1 reference=4
+ERROR cluster 1200 refcount=1 reference=5
+ERROR cluster 1201 refcount=1 reference=3
+<...> snip many errors
+Leaked cluster 94847 refcount=3 reference=0
+Leaked cluster 94848 refcount=3 reference=0
+Leaked cluster 94849 refcount=11 reference=0
+Leaked cluster 94850 refcount=14 reference=0
+
+20503 errors were found on the image.
+Data may be corrupted, or further writes to the image may corrupt it.
+
+20503 leaked clusters were found on the image.
+This means waste of disk space, but no harm to data.
+197000/327680 = 60.12% allocated, 89.32% fragmented, 88.50% compressed clusters
+Image end offset: 6216220672
+
+
+The resultant image seems to work fine in a VM when used as a backing file.
+
+Interestingly, if I substitute a qemu-img binary from qemu-4.0 then no errors are reported.
+
+# /tmp/qemu-img check test1-z.qcow2
+No errors were found on the image.
+197000/327680 = 60.12% allocated, 89.32% fragmented, 88.50% compressed clusters
+Image end offset: 6216220672
+
+Is the image corrupted or not? I'm guessing not.
+
+Just in case it matters, this is ext4 fs on rotational disk. Latest Arch Linux but self compiled 4.1.0 with recent QCOW2 corruption fixes added.
+
+I haven't tried latest trunk but might do so if time permits.
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