When I run it, it gets SIGSEGV:
# gdb --args /usr/lib/YaST2/bin/y2base sw_single -S '(qt)' qt
(gdb) where
#0  QHash (this=0x7fffd3680ab0 <KAuth::s_watchers>) at /usr/include/QtCore/qhash.h:281
#1  __static_initialization_and_destruction_0 (__initialize_p=1, __priority=65535) at /usr/src/debug/kdelibs-4.13.80/kdecore/auth/kauthactionwatcher.cpp:44
#2  _GLOBAL__sub_I_kauthactionwatcher.cpp(void) () at /usr/src/debug/kdelibs-4.13.80/build/kdecore/kauthactionwatcher.moc:155
#3  0x00007ffff7dea92a in call_init (l=<optimized out>, argc=argc@entry=5, argv=argv@entry=0x7fffffffddc8, env=env@entry=0x717ec50) at dl-init.c:78
#4  0x00007ffff7deaa13 in call_init (env=0x717ec50, argv=0x7fffffffddc8, argc=5, l=<optimized out>) at dl-init.c:36
#5  _dl_init (main_map=main_map@entry=0x69c62a0, argc=5, argv=0x7fffffffddc8, env=0x717ec50) at dl-init.c:126
#6  0x00007ffff7deeb48 in dl_open_worker (a=a@entry=0x7fffffff59d8) at dl-open.c:566
#7  0x00007ffff7dea7e4 in _dl_catch_error (objname=objname@entry=0x7fffffff59c8, errstring=errstring@entry=0x7fffffff59d0, mallocedp=mallocedp@entry=0x7fffffff59c7, 
    operate=operate@entry=0x7ffff7dee870 <dl_open_worker>, args=args@entry=0x7fffffff59d8) at dl-error.c:187
#8  0x00007ffff7dee33b in _dl_open (file=0x69c5cd8 "/usr/lib64/libproxy-0.4.11/modules/config_kde4.so", mode=-2147483647, caller_dlopen=<optimized out>, nsid=-2, argc=5, 
    argv=0x7fffffffddc8, env=0x717ec50) at dl-open.c:650
#9  0x00007ffff675702b in dlopen_doit (a=a@entry=0x7fffffff5bf0) at dlopen.c:66
#10 0x00007ffff7dea7e4 in _dl_catch_error (objname=0x603980, errstring=0x603988, mallocedp=0x603978, operate=0x7ffff6756fd0 <dlopen_doit>, args=0x7fffffff5bf0)
    at dl-error.c:187
#11 0x00007ffff67575dd in _dlerror_run (operate=operate@entry=0x7ffff6756fd0 <dlopen_doit>, args=args@entry=0x7fffffff5bf0) at dlerror.c:163
#12 0x00007ffff67570c1 in __dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:87
#13 0x00007fffeb0cbf25 in libmodman::module_manager::load_file(std::string, bool) () from /usr/lib64/libmodman.so.1
#14 0x00007fffeb0cc2b3 in libmodman::module_manager::load_dir(std::string, bool) () from /usr/lib64/libmodman.so.1
#15 0x00007fffed12ee06 in ?? () from /usr/lib64/libproxy.so.1
#16 0x00007fffed12f9bb in px_proxy_factory_new () from /usr/lib64/libproxy.so.1
#17 0x00007fffee64ba51 in zypp::media::ProxyInfoLibproxy::ProxyInfoLibproxy() () from /usr/lib64/libzypp.so.1426
#18 0x00007fffee675aac in zypp::media::ProxyInfo::ProxyInfo() () from /usr/lib64/libzypp.so.1426
#19 0x00007fffee676c22 in zypp::media::fillSettingsSystemProxy(zypp::Url const&, zypp::media::TransferSettings&) () from /usr/lib64/libzypp.so.1426