[Bug 1877418] [NEW] qemu-nbd freezes access to VDI file

[Bug 1877418] [NEW] qemu-nbd freezes access to VDI file

[Bump]

Public bug reported:

Mounted Oracle Virtualbox .vdi drive, which has GTP+BTRFS:
sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi

Then I am operating on the btrfs filesystem and suddenly it freezes.

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive, which has GTP+BTRFS:
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[Bump]

** Attachment added: "shell-commands.txt"
   https://bugs.launchpad.net/qemu/+bug/1877418/+attachment/5367894/+files/shell-commands.txt

** Description changed:

  Mounted Oracle Virtualbox .vdi drive, which has GTP+BTRFS:
+ sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  
  Then I am operating on the btrfs filesystem and suddenly it freezes.

** Description changed:

- Mounted Oracle Virtualbox .vdi drive, which has GTP+BTRFS:
+ Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  
  Then I am operating on the btrfs filesystem and suddenly it freezes.

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Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[Bump]

** Attachment added: "dmesg-bug-qemu-nbd-btrfs-vdi.txt"
   https://bugs.launchpad.net/qemu/+bug/1877418/+attachment/5367895/+files/dmesg-bug-qemu-nbd-btrfs-vdi.txt

** Also affects: btrfs-progs (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
+ mount /dev/nbd0p1 /mydata/
  
  Then I am operating on the btrfs filesystem and suddenly it freezes.

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https://bugs.launchpad.net/bugs/1877418

Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[John Snow]

I don't recommend you use VDI images in this way; we do not intend to
support performant RW access; support for VDI images is there to convert
to qcow2 or raw, generally.

That said, some questions that might be interesting to know the answer
to:

- Try converting your VDI image to raw or qcow2 and mounting that instead. Does the conversion work successfully? Can you export that image via qemu-nbd and mount it? Does it work?
- Do non-BTRFS filesystems cause any problems?

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Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[Bump]

I thought there were qemu-img for that. Since qemu-nbd allows mounting
images a rw block devices, it's logical to think that you can use it for
that purpose. Will try to reproduce again the issue in case it was a
kernel problem instead of qemu-nbd.

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Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[John Snow]

I agree, the program doesn't stop you from doing such things. It should
work without error, but it might be slow. Just offering some advice you
may not want to use it like this.

Try to reproduce with qcow2 and qemu-nbd to see if the problem is with
our support of the disk image format or if it's a problem with e.g. the
access patterns and qemu-nbd itself, for instance.

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Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[Bump]

Tied again with same .vdi as block device for 4 hours, didn't experience
further problems. don't know how to reproduce the issue again, even
don't know if has been fixed with any software update.

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Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[John Snow]

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

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Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  Incomplete
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[Thomas Huth]

** Changed in: btrfs-progs (Ubuntu)
       Status: New => Incomplete

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You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1877418

Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  Incomplete
Status in btrfs-progs package in Ubuntu:
  Incomplete

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

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[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[Launchpad Bug Tracker]

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

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

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1877418

Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  Expired
Status in btrfs-progs package in Ubuntu:
  Expired

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1877418/+subscriptions

[Bug 1877418] Re: qemu-nbd freezes access to VDI file

[Launchpad Bug Tracker]

[Expired for btrfs-progs (Ubuntu) because there has been no activity for
60 days.]

** Changed in: btrfs-progs (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1877418

Title:
  qemu-nbd freezes access to VDI file

Status in QEMU:
  Expired
Status in btrfs-progs package in Ubuntu:
  Expired

Bug description:
  Mounted Oracle Virtualbox .vdi drive (dynamically allocated), which has GTP+BTRFS:
  sudo modprobe nbd max_part=16
  sudo qemu-nbd -c /dev/nbd0 /storage/btrfs.vdi
  mount /dev/nbd0p1 /mydata/

  Then I am operating on the btrfs filesystem and suddenly it freezes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1877418/+subscriptions