Version-Release number of selected component:
gvfs-1.22.2-1.fc21

Additional info:
reporter:       libreport-2.3.0
backtrace_rating: 4
cmdline:        /usr/libexec/gvfs-udisks2-volume-monitor
crash_function: g_type_check_instance_cast
executable:     /usr/libexec/gvfs-udisks2-volume-monitor
kernel:         3.17.6-300.fc21.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_type_check_instance_cast at gtype.c:4008
 #1 unmount_operation_is_eject at gvfsudisks2mount.c:584
 #2 unmount_data_complete at gvfsudisks2mount.c:598
 #3 lock_cb at gvfsudisks2mount.c:815
 #4 g_simple_async_result_complete at gsimpleasyncresult.c:763
 #5 reply_cb at gdbusproxy.c:2623
 #6 g_simple_async_result_complete at gsimpleasyncresult.c:763
 #7 g_dbus_connection_call_done at gdbusconnection.c:5502
 #8 g_simple_async_result_complete at gsimpleasyncresult.c:763
 #9 complete_in_idle_cb at gsimpleasyncresult.c:775