To Stefan: yes, I can reproduce this on qemu.git/master.
Actually, I've found the cause of this bug and sent a patch to qemu-devel mailing list a few days ago: http://lists.nongnu.org/archive/html/qemu-devel/2014-05/msg05777.html It's very kind of you helping review the patch and give some comments. Thanks. Cong Meng. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1321684 Title: block_stream command stalls Status in QEMU: New Bug description: block_stream command stalls near finishing. I tried 1.7.1, 2.0.0 and the master versions. All of them stalled. But the 1.1.2 could finish the job. Here is how to reproduce it: $ sudo $QEMU \ -enable-kvm -cpu qemu64 -m 1024 \ -monitor stdio \ -drive file=./i1,if=none,id=drive_0,cache=none,aio=native -device virtio-blk-pci,drive=drive_0,bus=pci.0,addr=0x5 \ QEMU 2.0.50 monitor - type 'help' for more information (qemu) VNC server running on `127.0.0.1:5900' (qemu) snapshot_blkdev drive_0 s1 Formatting 's1', fmt=qcow2 size=26843545600 backing_file='./i1' backing_fmt='qcow2' encryption=off cluster_size=65536 lazy_refcounts=off (qemu) block_stream drive_0 (qemu) info block-jobs Streaming device drive_0: Completed 400818176 of 26843545600 bytes, speed limit 0 bytes/s (qemu) info block-jobs Streaming device drive_0: Completed 904396800 of 26843545600 bytes, speed limit 0 bytes/s (qemu) info block-jobs Streaming device drive_0: Completed 23401070592 of 26843545600 bytes, speed limit 0 bytes/s (qemu) info block-jobs Streaming device drive_0: Completed 26513768448 of 26843545600 bytes, speed limit 0 bytes/s (qemu) main-loop: WARNING: I/O thread spun for 1000 iterations info block-jobs Streaming device drive_0: Completed 26841513984 of 26843545600 bytes, speed limit 0 bytes/s (qemu) info block-jobs Streaming device drive_0: Completed 26841513984 of 26843545600 bytes, speed limit 0 bytes/s (qemu) info block-jobs Streaming device drive_0: Completed 26841513984 of 26843545600 bytes, speed limit 0 bytes/s #### here, the progress stopped at 26841513984 #### $ qemu-img info i1 image: i1 file format: qcow2 virtual size: 25G (26843545600 bytes) disk size: 1.0G cluster_size: 2097152 Format specific information: compat: 1.1 lazy refcounts: false To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1321684/+subscriptions
