Public bug reported:
I had some issues with nautlilus in the past time, that of cause need to
be resolved by the nautlilus devs, but it turns out that IO freezes (eg.
dropped sftp connections) may freeze nautlilus while drag and drop
operations, and hence freeze metacity in some kind, as d&d seems to lock
some control to the participating applications.
What I do:
Drag a file from nautilus.
What happens:
Nautilus blocks for some reason, eg. dropped sftp connection. The mouse
pointer stays in dragging state after releasing the mouse button. No
drop action is executed. Windows can still be bought to front by
clicking them, but never gain focus and no application (besides
nautlilus I guess, which is stalled) receives clicks or keystrokes. If
at some point nautilus crashes in turn, the system usability is fully
restored. If not, a restart by hard shutdown is needed to regain
control.
What should happen:
If an application fails to commence it's drag and drop interaction, the
action should be canceled on metacity's behalf. Otherwise any rogue
application can stop user interaction down to moving the pointer around,
requiring hard reboot.
Security considerations:
Low. The freezed state seems to block screen locking, and may reveal an
unprotected desktop if the rogue application releases control at some
point, eg. by crashing.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: metacity 1:3.18.7-0ubuntu0.3
ProcVersionSignature: Ubuntu 4.4.0-105.128-generic 4.4.98
Uname: Linux 4.4.0-105-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Mon Jan 8 14:52:41 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-08-23 (503 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: metacity
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: metacity (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1741902
Title:
Drag and drop state may be freezed by rogue application
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