[Bug 1848556] Re: qemu-img check failing on remote image in Eoan

[Christian Ehrhardt ]

Since it seemed so easy, while bisecting I found that it hangs with
v4.0.0 and v3.1.0 from git and even v3.0.0.

Since the reported good version was 3.1 I began to wonder if I might have 
overlooked something.
I wondered if it might be e.g. the apache version providing a different 
behavior on http.


I was trying to access the same apache server with 4.0 and 3.1 and ran it 
against the download target:
$ qemu-img check 
https://download.fedoraproject.org/pub/fedora/linux/releases/30/Cloud/x86_64/images/Fedora-Cloud-Base-30-1.2.x86_64.qcow2

3.1 ran into a segfault and 4.0 seems to hang on that.
Maybe I should take a break and revisit that later, as people might have an 
idea already what this might be about.

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https://bugs.launchpad.net/bugs/1848556

Title:
  qemu-img check failing on remote image in Eoan

Status in QEMU:
  Confirmed
Status in qemu package in Ubuntu:
  New

Bug description:
  The "qemu-img check" function is failing on remote (HTTP-hosted)
  images, beginning with Ubuntu 19.10 (qemu-utils version 1:4.0+dfsg-
  0ubuntu9). With previous versions, through Ubuntu 19.04/qemu-utils
  version 1:3.1+dfsg-2ubuntu3.5, the following worked:

  $ /usr/bin/qemu-img check  
http://10.193.37.117/cloud/eoan-server-cloudimg-amd64.img
  No errors were found on the image.
  19778/36032 = 54.89% allocated, 90.34% fragmented, 89.90% compressed clusters
  Image end offset: 514064384

  The 10.193.37.117 server holds an Apache server that hosts the cloud
  images on a LAN. Beginning with Ubuntu 19.10/qemu-utils 1:4.0+dfsg-
  0ubuntu9, the same command never returns. (I've left it for up to an
  hour with no change.) I'm able to wget the image from the same server
  and installation on which qemu-img check fails. I've tried several
  .img files on the server, ranging from Bionic to Eoan, with the same
  results with all of them.

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