Comment 17 for bug 1032925

Hm, the backtrace show that there is a "mount-added" signal
...
#4 0x00007fe4c9667710 in g_signal_emit_by_name (instance=0x25b0230, detailed_signal=0x7fe4bb1e3f31 "mount-added") at /build/buildd/glib2.0-2.33.6/./gobject/gsignal.c:3393
        var_args = {{gp_offset = 16, fp_offset = 48, overflow_arg_area = 0x7fffff8f18b0, reg_save_area = 0x7fffff8f17c0}}
        detail = 0
        signal_id = 209
        __PRETTY_FUNCTION__ = "g_signal_emit_by_name"
...

this indicates there might be a link to Bug #1032953 as this looks releated to gvfs and keeping track of the mounts.