Obex file transfer via bluetooth hangs

[Michael Mess]

While copying files via bluetooth, sometimes the file transfer process freezes.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gvfs-backends 1.12.1-0ubuntu1.2
ProcVersionSignature: Ubuntu 3.2.0-60.91-generic-pae 3.2.55
Uname: Linux 3.2.0-60-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Sun Apr 13 15:51:28 2014
ExecutablePath: /usr/lib/gvfs/gvfsd-obexftp
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MarkForUpload: True
SourcePackage: gvfs
UpgradeStatus: No upgrade log present (probably fresh install)

[Michael Mess (michael-michaelmess)]

Attached screenshot of file copy process.

The "File operations" window will be redrawn when necessary, but it's content does not change after the file transfer got frozen, even the remaining time will not be updated

I would expect that the word "stalled" is displayed, as long as the transfer does not proceed.

Also I would expect that the file transport recovers from beeing stalled.

[Michael Mess (michael-michaelmess)]

Attached picture of error message that occurred after turning off Bluetooth on the mobile phone to end the hanging file transport.

[Michael Mess (michael-michaelmess)]

The hang condition, could that be something like a deadlock via the bluetooth communication that can be broken only by terminating the bluetooth connection?
Maybe the computer is waiting for something (new data?) without timeout, but the counter party still wants previous data to be acknowledged before sending new data but the computer cannot do this while waiting for new data?
As I didn't have a look at the code, this is all speculation.

[Michael Mess (michael-michaelmess)]

The bug is still present after upgrading to Ubuntu 14.04 LTS.