Well, that's too bad. At least it's non-fatal, which means that qemu will only refuse to read that single cluster (still, it will stop convert from working because that requires the whole image to be readable).
So another idea would be to use qemu-nbd and the nbd kernel module to bind the image to a block device under /dev and then use dd to copy as much data off as possible; or to use qemu-img dd which will be part of qemu 2.8 (it only has a subset of dd's functionality, but it does support skip and count, so it's enough to copy around the corrupted clusters). Apart from that, we do want to improve qemu-img check in the future so that it can repair more types of corruption (such as the one you're facing), but it's not yet being worked on. Max -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1639225 Title: qcow2 - filesize 8.1Petabyte Status in QEMU: Incomplete Bug description: problem : Filesystem Size Used Avail Use% Mounted on /dev/sdd1 120G 63G 57G 53% /storage/kvmstorage4ssd # pwd /storage/kvmstorage4ssd/images # qemu-img info vsys19_ssd1.qcow2 image: vsys19_ssd1.qcow2 file format: qcow2 virtual size: 20G (21474836480 bytes) disk size: 11G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true refcount bits: 16 corrupt: true # ls -lah vsys19_* -rw------- 1 root root 8.1P Nov 4 13:16 vsys19_ssd1.qcow2 # ls -la vsys19_* -rw------- 1 root root 9007203702079488 Nov 4 13:16 vsys19_ssd1.qcow2 # qemu-img check vsys19_ssd1.qcow2 qemu-img: Check failed: File too large # xfs_repair /dev/sdd1 Phase 1 - find and verify superblock... Phase 2 - using internal log - zero log... - scan filesystem freespace and inode maps... - found root inode chunk Phase 3 - for each AG... - scan and clear agi unlinked lists... - process known inodes and perform inode discovery... - agno = 0 - agno = 1 - agno = 2 - agno = 3 - process newly discovered inodes... Phase 4 - check for duplicate blocks... - setting up duplicate extent list... - check for inodes claiming duplicate blocks... - agno = 0 - agno = 1 - agno = 2 - agno = 3 Phase 5 - rebuild AG headers and trees... - reset superblock... Phase 6 - check inode connectivity... - resetting contents of realtime bitmap and summary inodes - traversing filesystem ... - traversal finished ... - moving disconnected inodes to lost+found ... Phase 7 - verify and correct link counts... done # pwd /storage/kvmstorage4ssd/images <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/storage/kvmstorage4ssd/images/vsys19_ssd1.qcow2'/> <target dev='vdn' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0f' function='0x0'/> </disk> guest OS: # uname -a Linux vsys19 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1 (2015-05-24) x86_64 GNU/Linux cat /etc/debian_version stretch/sid Nov 4 01:23:26 vsys19 kernel: [7654313.024844] end_request: I/O error, dev vdk, sector 8691272 Nov 4 01:23:26 vsys19 kernel: [7654313.025328] EXT4-fs warning (device dm-1): ext4_end_bio:317: I/O error -5 writing to inode 262305 (offset 0 size 4202496 s tarting block 1085897) Nov 4 01:23:26 vsys19 kernel: [7654313.025334] Buffer I/O error on device dm-1, logical block 1085897 Nov 4 01:23:26 vsys19 kernel: [7654313.025488] Buffer I/O error on device dm-1, logical block 1085898 Nov 4 01:23:26 vsys19 kernel: [7654313.025632] Buffer I/O error on device dm-1, logical block 1085899 Nov 4 01:23:26 vsys19 kernel: [7654313.025776] Buffer I/O error on device dm-1, logical block 1085900 Nov 4 01:23:26 vsys19 kernel: [7654313.025920] Buffer I/O error on device dm-1, logical block 1085901 Nov 4 01:23:26 vsys19 kernel: [7654313.026064] Buffer I/O error on device dm-1, logical block 1085902 Nov 4 01:23:26 vsys19 kernel: [7654313.026207] Buffer I/O error on device dm-1, logical block 1085903 Nov 4 01:23:26 vsys19 kernel: [7654313.026350] Buffer I/O error on device dm-1, logical block 1085904 Nov 4 01:23:26 vsys19 kernel: [7654313.026500] Buffer I/O error on device dm-1, logical block 1085905 Nov 4 01:23:26 vsys19 kernel: [7654313.028837] Buffer I/O error on device dm-1, logical block 1085906 Nov 4 01:23:26 vsys19 kernel: [7654313.031122] end_request: I/O error, dev vdk, sector 8692280 Nov 4 01:23:26 vsys19 kernel: [7654313.031325] EXT4-fs warning (device dm-1): ext4_end_bio:317: I/O error -5 writing to inode 262305 (offset 0 size 4202496 starting block 1086023) Nov 4 01:23:26 vsys19 kernel: [7654313.031388] end_request: I/O error, dev vdk, sector 8693288 Nov 4 01:23:26 vsys19 kernel: [7654313.031527] EXT4-fs warning (device dm-1): ext4_end_bio:317: I/O error -5 writing to inode 262305 (offset 0 size 4202496 starting block 1086149) Nov 4 01:23:26 vsys19 kernel: [7654313.031598] end_request: I/O error, dev vdk, sector 8694296 Nov 4 01:23:26 vsys19 kernel: [7654313.031736] EXT4-fs warning (device dm-1): ext4_end_bio:317: I/O error -5 writing to inode 262305 (offset 0 size 4202496 starting block 1086275) Nov 4 01:23:26 vsys19 kernel: [7654313.031798] end_request: I/O error, dev vdk, sector 8695304 Nov 4 01:23:26 vsys19 kernel: [7654313.031933] EXT4-fs warning (device dm-1): ext4_end_bio:317: I/O error -5 writing to inode 262305 (offset 0 size 4202496 starting block 1086401) KVM host : # cat /etc/debian_version stretch/sid Debian # uname -a Linux asus1 4.5.5-custom #1 SMP Sun May 22 21:14:57 CEST 2016 x86_64 GNU/Linux # dpkg -l | grep -i qemu ii ipxe-qemu 1.0.0+git-20150424.a25a16d-1 all PXE boot firmware - ROM images for qemu ii qemu 1:2.5+dfsg-5+b1 amd64 fast processor emulator ii qemu-kvm 1:2.5+dfsg-5+b1 amd64 QEMU Full virtualization on x86 hardware ii qemu-slof 20151103+dfsg-2 all Slimline Open Firmware -- QEMU PowerPC version ii qemu-system 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries ii qemu-system-arm 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries (arm) ii qemu-system-common 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries (common files) ii qemu-system-mips 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries (mips) ii qemu-system-misc 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries (miscelaneous) ii qemu-system-ppc 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries (ppc) ii qemu-system-sparc 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries (sparc) ii qemu-system-x86 1:2.5+dfsg-5+b1 amd64 QEMU full system emulation binaries (x86) ii qemu-user 1:2.5+dfsg-5+b1 amd64 QEMU user mode emulation binaries ii qemu-user-binfmt 1:2.5+dfsg-5+b1 amd64 QEMU user mode binfmt registration for qemu-user ii qemu-utils 1:2.5+dfsg-5+b1 amd64 QEMU utilities ii qemubuilder 0.80 amd64 pbuilder using QEMU as backend To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1639225/+subscriptions
