hang when iPod plugin is enabled and iPod is connected

[jimav]

Binary package hint: exaile

Installing exaile-plugin-ipod seems to have no effect whatsoever!
The iPod plug-in does not appear in the plugin list shown by Edit->Preferences, and nothing appears in the Device Manager.

Running exaile --debug shows many plugins being loaded, but not an ipod plugin.

Please see attachment for debug log and file listings.

This is under Ubuntu 10.04.1 LTS amd64.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: exaile-plugin-ipod 0.3.1.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-24.39-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
Architecture: amd64
Date: Sat Aug 7 14:34:14 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: exaile

[jimav (james-avera)]

Ok, I see now that you have to check the entry in the plug-in list shown in Preferences. But checking the iPod plugin immediately freezes exaile. Kill-9 is needed to stop the process.

I removed $HOME/.cache/exaile .config/exaile .local/share/exaile
and restarted, but the same hang occurred when the iPod plugin enabled.

The following is output on the terminal before the freeze:

** (exaile.py:2461): WARNING **: Unknown action (0xffffffff) in smart playlist will be ignored.

** (exaile.py:2461): WARNING **: Unknown smart rule action at 5371130: ffffffff. Trying to continue.

** (exaile.py:2461): WARNING **: Unknown action (0x2000400) in smart playlist will be ignored.

** (exaile.py:2461): WARNING **: Unknown smart rule action at 7516104: 2000400. Trying to continue.

** (exaile.py:2461): WARNING **: Unknown action (0x2000400) in smart playlist will be ignored.

** (exaile.py:2461): WARNING **: Unknown smart rule action at 7517416: 2000400. Trying to continue.

** (exaile.py:2461): WARNING **: Unknown action (0x2000400) in smart playlist will be ignored.

** (exaile.py:2461): WARNING **: Unknown smart rule action at 7518732: 2000400. Trying to continue.

** (exaile.py:2461): WARNING **: Unknown action (0x2000400) in smart playlist will be ignored.

** (exaile.py:2461): WARNING **: Unknown smart rule action at 7520042: 2000400. Trying to continue.

[Andrew Starr-Bochicchio (andrewsomething)]

I think this might be a bug with the under lying python-gpodder, not exaile itself. But I can't really debug this myself as I don't have an iPod.

libmtp bug 546714 suggest that iPhone support and MTP support cause a conflict. Could you try disabling the USB Mass Storage plugin for Exaile?

[jimav (james-avera)]

It looks like a thread deadlock on a semaphore.

USB Mass Storage was not enabled. Just to be sure, I first disabled -all- plugins, exited, restarted, then enabled the iPod plugin, and still got the hang.

Attached is a stack-trace obtained by running a debuggable python under gdb (using a modified /usr/bin/exaile script).
After the hang I typed Control-C to get the attention of gdb, and it reported stopping the process at

     0x00007ffff7bccb50 in sem_wait () from /lib/libpthread.so.0

Please see the attached gdb log file for a complete stack trace, which also shows some python code context.