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Can reproduce it on rhel6.7 release version.
pkg version:
qemu-kvm-rhev-0.12.1.2-2.479.el6.x86_64
qemu-img-rhev-0.12.1.2-2.479.el6.x86_64
When trigger cont after extend lvm at the first time, the image occured error.
Description of problem: Install rhel6.7 guest on a small lvm based iscsi storage, and enlarge lvm to resume installing guest when there is no space. After installation, check guest image with error info. Version-Release number of selected component (if applicable): qemu-kvm-rhev-0.12.1.2-2.483.el6.x86_64 qemu-img-rhev-0.12.1.2-2.483.el6.x86_64 kernel-2.6.32-595.el6.x86_64 How reproducible: 4/5 Steps to Reproduce: 1.login iscsi server and create lvm on host. # iscsiadm -m node -T iqn.2016-01.com.xiagao:server.target0 -p 10.66.83.216 --login # vgcreate vgtest /dev/sdc # lvcreate -L 3g -n lvtest vgtest # lvs lvtest vgtest -wi-a----- 3.00g 2.Create a large enough qcow2 file on lvm . # qemu-img create -f qcow2 /dev/vgtest/lvtest 80G 3.Install rhel6.7.z guest with -drive file=...,format=qcow2...., using pxe installaion method /usr/libexec/qemu-kvm \ -S \ -name 'virt-tests-vm1' \ -machine rhel6.6.0 \ -nodefaults \ -vga cirrus \ -drive file=/dev/vgtest/lvtest,if=none,id=drive-virtio-disk0,boot=on,format=qcow2,cache=none,werror=stop,rerror=stop \ -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 \ -device virtio-net-pci,mac=9a:d5:d6:d7:d8:d9,id=idnNqY2H,vectors=4,netdev=idz3Tned,bus=pci.0,addr=05 \ -netdev tap,id=idz3Tned \ -m 4096 \ -smp 4,cores=4,threads=1,sockets=1 \ -cpu 'Conroe' \ -vnc :0 \ -enable-kvm \ -monitor stdio 4.wait until vm pause on no space 5.extend the lvm. # lvextend -L +50M /dev/vgtest/lvtest 6.in qmp monitor . issue cont. for qmp : {"execute":"cont"} 7. repeat 4~6. 8. after installation, check guest image Actual results: #qemu-img check /dev/vgtest/lvtest Leaked cluster 49092 refcount=1 reference=0 Leaked cluster 49093 refcount=1 reference=0 Leaked cluster 49094 refcount=1 reference=0 Leaked cluster 49095 refcount=1 reference=0 Leaked cluster 49096 refcount=1 reference=0 ........ Leaked cluster 69715 refcount=1 reference=0 Leaked cluster 69716 refcount=1 reference=0 Leaked cluster 69717 refcount=1 reference=0 Leaked cluster 69718 refcount=1 reference=0 Leaked cluster 69719 refcount=1 reference=0 Leaked cluster 69720 refcount=1 reference=0 4595 leaked clusters were found on the image. This means waste of disk space, but no harm to data. Image end offset: 4759093248 Expected results: no error. Additional info: 1.host cpu info processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 107 model name : AMD Athlon(tm) Dual Core Processor 5400B stepping : 2 cpu MHz : 1000.000 cache size : 512 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch lbrv 2.after installation,check lvm # lvs lvtest vgtest -wi-a----- 4.74g 3.guest can boot normally. 4.guest imag info # qemu-img info /dev/vgtest/lvtest image: /dev/vgtest/lvtest file format: qcow2 virtual size: 80G (85899345920 bytes) disk size: 0 cluster_size: 65536