.
Thread 1 (LWP 2660):
#0  0x800dda38 in bus_deserialize_and_dump_unit_file_changes (m=0x81c2b4d0, quiet=<optimized out>, changes=0x0, n_changes=0x0) at ../src/shared/bus-unit-util.c:893
        type = 0x81c2b01c "symlink"
        path = 0x81c2b028 "/etc/systemd/system/default.target"
        source = 0x81c2b050 "/lib/systemd/system/oem-config.target"
        r = <optimized out>
        r = <optimized out>
        __func__ = "bus_deserialize_and_dump_unit_file_changes"
#1  0x800ab2b5 in set_default.lto_priv.408 (argc=2, argv=0xbfee37f8, userdata=0x0) at ../src/systemctl/systemctl.c:2101
        error = {name = 0x0, message = 0x0, _need_free = 0}
        reply = 0x81c2b4d0
        bus = 0x81c2a880
        unit = 0x81c2a868 "oem-config.target"
        r = <optimized out>
        __PRETTY_FUNCTION__ = "set_default"
        __func__ = "set_default"
#2  0x800a44d2 in dispatch_verb (verbs=0x80147380 <verbs>, userdata=0x0, argv=<optimized out>, argc=<optimized out>) at ../src/basic/verbs.c:92
        i = <optimized out>
        verb = <optimized out>
        name = <optimized out>
        left = 2
#3  systemctl_main () at ../src/systemctl/systemctl.c:7473
        argv = <optimized out>
        argc = <optimized out>
#4  main (argc=3, argv=0xbfee37f4) at ../src/systemctl/systemctl.c:7742
        r = <optimized out>
        __func__ = "main"
        __PRETTY_FUNCTION__ = "main"