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+id = 941
+title = "qemu-img cannot repair a qcow2 in an LV because size is mis-detected when qcow2 is on an LV"
+state = "closed"
+created_at = "2022-03-27T16:17:39.184Z"
+closed_at = "2022-04-20T18:11:21.553Z"
+labels = ["Storage", "kind::Bug", "qemu-img"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/941"
+host-os = "(Windows 10 21H1, Fedora 34, etc.)"
+host-arch = "(x86, ARM, s390x, etc.)"
+qemu-version = "(e.g. `qemu-system-x86_64 --version`)"
+guest-os = "(Windows 10 21H1, Fedora 34, etc.)"
+guest-arch = "(x86, ARM, s390x, etc.)"
+description = """This is RHEV with Tb's of VMs which need to be repaired due to a datacenter-wide (the real datacenter) power outage.
+
+Each of these VMs are on individual LVs but qemu-img check fails to perform repairs:
+
+
+```
+ERROR cluster 24481205 refcount=0 reference=1
+ERROR cluster 24481206 refcount=0 reference=1
+Rebuilding refcount structure
+ERROR writing refblock: No space left on device <============
+qemu-img: Check failed: No space left on device
+```
+
+Running qemu-img check or info on the LV (/dev/dm-*) works well but repairs cannot be completed:
+
+```
+# qemu-img info /dev/cdd4e215-8c6b-4877-b2be-fdba383e7eb0/fb32333b-2334-4e10-8c42-02bc97e826cc
+image: /dev/cdd4e215-8c6b-4877-b2be-fdba383e7eb0/fb32333b-2334-4e10-8c42-02bc97e826cc
+file format: qcow2
+virtual size: 1.5 TiB (1649267441664 bytes)
+disk size: 0 B <================================
+cluster_size: 65536
+Format specific information:
+    compat: 1.1
+    compression type: zlib
+    lazy refcounts: true
+    refcount bits: 16
+    corrupt: false
+    extended l2: false
+```"""
+reproduce = """1. Have a damaged VM with its qcow2 in an LV
+2. run 'qemu-img check <device>' verify that it properly detects the blocks which need fixing.
+3. run 'qemu-img check -r all <device>', it exits with 'no space left on device´ after a few seconds."""
+additional = """https://bugzilla.redhat.com/show_bug.cgi?id=1519071
+
+
+Here is one example:"""