Re: [PATCH] qcow2: Expose bitmaps' size during measure

[Eric Blake <eblake@redhat.com>]

On 4/16/20 5:49 PM, no-reply@patchew.org wrote:
> Patchew URL: https://patchew.org/QEMU/20200416212349.731404-1-eblake@redhat.com/
> 
> 
> 
> Hi,
> 
> This series failed the docker-quick@centos7 build test. Please find the testing commands and
> their output below. If you have Docker installed, you can probably reproduce it
> locally.
> 
> === TEST SCRIPT BEGIN ===
> #!/bin/bash
> make docker-image-centos7 V=1 NETWORK=1
> time make docker-test-quick@centos7 SHOW_ENV=1 J=14 NETWORK=1
> === TEST SCRIPT END ===
> 
> Not run: 259
> Failures: 190
> Failed 1 of 117 iotests

Hmm - the email truncated the useful part of the failure.  Anyways, 
reading from...

> The full log is available at
> http://patchew.org/logs/20200416212349.731404-1-eblake@redhat.com/testing.docker-quick@centos7/?type=message.

I see:

--- /tmp/qemu-test/src/tests/qemu-iotests/190.out	2020-04-16 
21:15:51.000000000 +0000
+++ /tmp/qemu-test/build/tests/qemu-iotests/190.out.bad	2020-04-16 
22:45:47.504493172 +0000
@@ -4,6 +4,7 @@
  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2199023255552
  required size: 2199023255552
  fully allocated size: 2199023255552
+bitmaps size: 4846791580151137091
  required size: 335806464

which looks suspiciously like an uninitialized variable leaking through 
when there are no bitmaps to be measured.  I'll fix it in v2.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org