[Qemu-devel] [Bug 1321684] Re: block_stream command stalls

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1321684

Title:
  block_stream command stalls

Status in QEMU:
  Expired

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

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