blockdev: ioctl error on BLKRRPART: Device or resource busy

[dann frazier]

[Impact]
grml2usb autopkgtest frequently fail in Ubuntu's CI. For example:
  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-hirsute/hirsute/amd64/g/grml2usb/20201116_194744_cbe0f@/log.gz

An excerpt showing the error:
2020-11-17 14:14:49,362 Installing default MBR
2020-11-17 14:14:49,363 executing: dd if='/dev/loop0' of='/tmp/tmpa2umy9df' bs=5
12 count=1
2020-11-17 14:14:49,381 executing: dd if=/usr/share/grml2usb/mbr/mbrldr of=/tmp/
tmpa2umy9df bs=439 count=1 conv=notrunc
2020-11-17 14:14:49,385 executing: dd if='/tmp/tmpa2umy9df' of='/dev/loop0' bs=5
12 count=1 conv=notrunc
2020-11-17 14:14:49,401 executing: sync
2020-11-17 14:14:49,433 Probing device via 'blockdev --rereadpt /dev/loop0'
blockdev: ioctl error on BLKRRPART: Device or resource busy
2020-11-17 14:14:49,452 Execution failed: ("Couldn't execute blockdev on '%s' (i
nstall util-linux?)", '/dev/loop0')

[Test Case]
Run the built-in autopkgtest on a cloud instance.

[Where problems might occur]
We may find that the system wide sync is necessary in some other environments, which could cause a similar issue to this one to appear there.

[Launchpad Janitor (janitor)]

This bug was fixed in the package grml2usb - 0.18.3ubuntu2

---------------
grml2usb (0.18.3ubuntu2) hirsute; urgency=medium

  * Reformat grml2usb to fix build check.

 -- dann frazier <email address hidden> Tue, 24 Nov 2020 12:11:44 -0700

[Timo Aaltonen (tjaalton)]

Hello dann, or anyone else affected,

Accepted grml2usb into groovy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/grml2usb/0.18.3ubuntu0.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-groovy to verification-done-groovy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-groovy. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[dann frazier (dannf)]

Verification:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy/groovy/amd64/g/grml2usb/20201127_165906_ea94b@/log.gz

[Łukasz Zemczak (sil2100)]

The verification of the Stable Release Update for grml2usb has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

[Launchpad Janitor (janitor)]

This bug was fixed in the package grml2usb - 0.18.3ubuntu0.1

---------------
grml2usb (0.18.3ubuntu0.1) groovy; urgency=medium

  * [272b66e] Fix race condition with blockdev/BLKRRPART due to lack
    of fsync. LP: #1905452.

 -- dann frazier <email address hidden> Tue, 24 Nov 2020 11:58:37 -0700