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[Bug 2043784] [NEW] Image download fails with corrupt image hash mismatch

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Rajat Dhasmana <2043784@xxxxxxxxxxxxxxxxxx>
Date: Fri, 17 Nov 2023 09:44:25 -0000
Reply-to: Bug 2043784 <2043784@xxxxxxxxxxxxxxxxxx>
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Public bug reported:

Glance backend is Cinder and Cinder backend is RBD

Reproducer:

1. Create a volume from image (cirros in my case)
2. Launch an instance from the bootable volume
3. write a sparse file to the volume
dd if=/dev/zero of=sparsefile bs=1M count=1 seek=1K
4. Delete the instance (needed for next operation)
5. Upload the volume to image (only possible if volume is in available state)
6. Download the image
glance image-download <image-id> --file testfile.img

We hit the following error

[Errno 32] Corrupt image download. Hash was
684f9d8384ad816dbe9cdb2b7250da1304e4dda5a796d572fb4d682d38bab699c39586cef4ad175573bdcbfc9829100795772d96fe164fcc284748db442db5a1
expected
1379e418b9f00dd6b7ca0d9c3464f06c1a8eb4f6ed8073ae615275007636dc064f15a8b33404dfc53b7613a0517f4ab71be7aca3f391e0452da9bb2e98f503a6

I think it might be due to the inconsistency writing the sparse files.

** Affects: glance
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/2043784

Title:
Image download fails with corrupt image hash mismatch

Status in Glance:
New

Bug description:
Glance backend is Cinder and Cinder backend is RBD

Reproducer:

We hit the following error

I think it might be due to the inconsistency writing the sparse files.

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