/usr/lib/gvfs/gvfsd-mtp:11:__GI___pthread_mutex_lock:add_to_flying_list:libusb_submit_transfer:do_sync_bulk_transfer:libusb_bulk_transfer

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding gvfs. This problem was most recently seen with package version 1.28.2-1ubuntu2, the problem page at https://errors.ubuntu.com/problem/a2a8d695fe6c2a3c787fe9c70e06c25c8c394e03 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.