There was a similar bug reported as 0004125, but it says that it has been fixed. This might be very similar.

Here is the gdb output from running SlicerApp-real:

<pre>
$ gdb Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
GNU gdb (Debian 8.1-4+b1) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real...done.
(gdb) run
Starting program: /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffc893c700 (LWP 16265)]
[New Thread 0x7fffc3a8a700 (LWP 16266)]

Thread 1 "SlicerApp-real" received signal SIGSEGV, Segmentation fault.
strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
31 /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) bt full
#0 strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
No locals.
0000001 0x00007fffef5cef1c in getrn () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000002 0x00007fffef5cf230 in lh_insert () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000003 0x00007fffef51e8f0 in OBJ_NAME_add () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000004 0x00007fffc30a7cbe in openssl_add_all_ciphers_int () at ./build_shared/../crypto/evp/c_allc.c:83
No locals.
0000005 0x00007fffc30c2829 in ossl_init_add_all_ciphers () at ./build_shared/../crypto/init.c:216
No locals.
0000006 ossl_init_add_all_ciphersossl () at ./build_shared/../crypto/init.c:205
No locals.
0000007 0x00007fffebea4827 in pthread_once_slow (once_control=0x7fffc321b7d4 <add_all_ciphers>, init_routine=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:116
_buffer = {routine = 0x7fffebea4880 <clear_once_control>, arg = 0x7fffc321b7d4 <add_all_ciphers>, canceltype = -11104, prev = 0x0}
val = <optimized out>
newval = <optimized out>
0000008 0x00007fffebea48e5 in GI_pthread_once (once_control=once_control@entry=0x7fffc321b7d4 <add_all_ciphers>,
init_routine=init_routine@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>) at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:143
val = <optimized out>
0000009 0x00007fffc312b329 in CRYPTO_THREAD_run_once (once=once@entry=0x7fffc321b7d4 <add_all_ciphers>, init=init@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at ./build_shared/../crypto/threads_pthread.c:113
No locals.
0000010 0x00007fffc30c2d63 in OPENSSL_init_crypto (opts=opts@entry=76, settings=0x0) at ./build_shared/../crypto/init.c:585
settings = 0x0
opts = 76
ret = <optimized out>
0000011 0x00007fffc2edacd4 in OPENSSL_init_ssl (opts=0, settings=<optimized out>) at ./build_shared/../ssl/ssl_init.c:197
stoperrset = 0
0000012 0x00007fffef378a80 in QSslSocketPrivate::ensureLibraryLoaded() () at ./src/network/ssl/qsslsocket_openssl11.cpp:94
locker = {val = 140737207174017}
0000013 0x00007ffff70e3f4f in qSlicerCoreApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTCore/qSlicerCoreApplication.cxx:271
q = 0x7fffffffd8a0
PRETTY_FUNCTION__ = "virtual void qSlicerCoreApplicationPrivate::init()"
appLauncherSettings = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7ffff71a2740 <qt_meta_stringdata_ctkAppLauncherSettings>, data = 0x7ffff71a2780 <qt_meta_data_ctkAppLauncherSettings>,
static_metacall = 0x7ffff71572dc <ctkAppLauncherSettings::qt_static_metacall(QObject*, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {
d = 0x555555efae80}}
envVars = {{d = 0x555555f47ae0, e = 0x555555f47ae0}}
pathsEnvVars = {{d = 0x555555f557f0, e = 0x555555f557f0}}
userInfo = 0x555555b649f0
scene = {Object = 0x2ffe47294c563000}
model = 0x2ffe47294c563000
updatedExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::atomic_base<int>> = {
static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555f44d50},
d = 0x555555f44d50}}, <No data fields>}
uninstalledExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {
_q_value = {<std::atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555ef6100},
d = 0x555555ef6100}}, <No data fields>}
0000014 0x00007ffff7afbcbe in qSlicerApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:205
q = 0x7fffffffd8a0
generalPanel = 0x7fffffffd8c8
settingsModulesPanel = 0x555555ac4200
settingsStylesPanel = 0x2ffe47294c563000
settingsViewsPanel = 0x7fffffffd790
settingsUserPanel =
0x7ffff7b00efc <qGetPtrHelper<QScopedPointer<qSlicerCoreApplicationPrivate> >(QScopedPointer<qSlicerCoreApplicationPrivate, QScopedPointerDeleter<qSlicerCoreApplicationPrivate> > const&)+39>
settingsExtensionsPanel = 0x7fffffffd7c0
cachePanel = 0x7fffffffd8c8
developerPanel = 0x7fffffffda08
eventSource = 0x2ffe47294c563000
0000015 0x00007ffff7afcd10 in qSlicerApplication::qSlicerApplication (this=0x7fffffffd8a0, _argc=@0x7fffffffd85c: 1, _argv=0x7fffffffda08)
at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:359
d = 0x555555ac4200
d = <optimized out>
0000016 0x000055555555a8c9 in (anonymous namespace)::SlicerAppMain (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Applications/SlicerApp/Main.cxx:40
app = {<qSlicerCoreApplication> = {<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe48e9a80 <QApplication::staticMetaObject>,
stringdata = 0x7ffff716c0c0 <qt_meta_stringdata_qSlicerCoreApplication>, data = 0x7ffff716cd80 <qt_meta_data_qSlicerCoreApplication>,
static_metacall = 0x7ffff7144c08 <qSlicerCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void*)>, relatedMetaObjects = 0x0, extradata = 0x0}},
MyQVTK = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7fffef495fe0 <qt_meta_stringdata_ctkVTKObjectEventsObserver>, data = 0x7fffef496040 <qt_meta_data_ctkVTKObjectEventsObserver>,
static_metacall = 0x7fffef491246 <ctkVTKObjectEventsObserver::qt_static_metacall(QObject, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}},
d_ptr = {d = 0x555555e91060}}, d_ptr = {d = 0x555555ac4200}}, static staticMetaObject = {d = {superdata = 0x7ffff71d0420 <qSlicerCoreApplication::staticMetaObject>,
stringdata = 0x7ffff7bcde40 <qt_meta_stringdata_qSlicerApplication>, data = 0x7ffff7bce340 <qt_meta_data_qSlicerApplication>,
static_metacall = 0x7ffff7b9e9d6 <qSlicerApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
window = {d = 0x7fffdc602c48 <__internal_atexit+88>}
splashScreen = {d = 0x7fffffffd8c0}
0000017 0x000055555555abc1 in main (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Base/QTApp/qSlicerApplicationMainWrapper.cxx:56
No locals.
(gdb)
</pre>

I will try to work around this by doing as described in 0004125, i.e. trying Slicer_USE_SYSTEM_OpenSSL=OFF and/or Slicer_USE_PYTHONQT_WITH_OPENSSL=OFF.

There was a similar bug reported as 0004125, but it says that it has been fixed. This might be very similar.

Here is the gdb output from running SlicerApp-real:

<nowiki>
test
</nowiki>
<pre>
$ gdb Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
GNU gdb (Debian 8.1-4+b1) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real...done.
(gdb) run
Starting program: /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffc893c700 (LWP 16265)]
[New Thread 0x7fffc3a8a700 (LWP 16266)]

Thread 1 "SlicerApp-real" received signal SIGSEGV, Segmentation fault.
strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
31 /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) bt full
#0 strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
No locals.
0000001 0x00007fffef5cef1c in getrn () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000002 0x00007fffef5cf230 in lh_insert () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000003 0x00007fffef51e8f0 in OBJ_NAME_add () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000004 0x00007fffc30a7cbe in openssl_add_all_ciphers_int () at ./build_shared/../crypto/evp/c_allc.c:83
No locals.
0000005 0x00007fffc30c2829 in ossl_init_add_all_ciphers () at ./build_shared/../crypto/init.c:216
No locals.
0000006 ossl_init_add_all_ciphersossl () at ./build_shared/../crypto/init.c:205
No locals.
0000007 0x00007fffebea4827 in pthread_once_slow (once_control=0x7fffc321b7d4 <add_all_ciphers>, init_routine=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:116
_buffer = {routine = 0x7fffebea4880 <clear_once_control>, arg = 0x7fffc321b7d4 <add_all_ciphers>, canceltype = -11104, prev = 0x0}
val = <optimized out>
newval = <optimized out>
0000008 0x00007fffebea48e5 in GI_pthread_once (once_control=once_control@entry=0x7fffc321b7d4 <add_all_ciphers>,
init_routine=init_routine@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>) at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:143
val = <optimized out>
0000009 0x00007fffc312b329 in CRYPTO_THREAD_run_once (once=once@entry=0x7fffc321b7d4 <add_all_ciphers>, init=init@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at ./build_shared/../crypto/threads_pthread.c:113
No locals.
0000010 0x00007fffc30c2d63 in OPENSSL_init_crypto (opts=opts@entry=76, settings=0x0) at ./build_shared/../crypto/init.c:585
settings = 0x0
opts = 76
ret = <optimized out>
0000011 0x00007fffc2edacd4 in OPENSSL_init_ssl (opts=0, settings=<optimized out>) at ./build_shared/../ssl/ssl_init.c:197
stoperrset = 0
0000012 0x00007fffef378a80 in QSslSocketPrivate::ensureLibraryLoaded() () at ./src/network/ssl/qsslsocket_openssl11.cpp:94
locker = {val = 140737207174017}
0000013 0x00007ffff70e3f4f in qSlicerCoreApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTCore/qSlicerCoreApplication.cxx:271
q = 0x7fffffffd8a0
PRETTY_FUNCTION__ = "virtual void qSlicerCoreApplicationPrivate::init()"
appLauncherSettings = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7ffff71a2740 <qt_meta_stringdata_ctkAppLauncherSettings>, data = 0x7ffff71a2780 <qt_meta_data_ctkAppLauncherSettings>,
static_metacall = 0x7ffff71572dc <ctkAppLauncherSettings::qt_static_metacall(QObject*, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {
d = 0x555555efae80}}
envVars = {{d = 0x555555f47ae0, e = 0x555555f47ae0}}
pathsEnvVars = {{d = 0x555555f557f0, e = 0x555555f557f0}}
userInfo = 0x555555b649f0
scene = {Object = 0x2ffe47294c563000}
model = 0x2ffe47294c563000
updatedExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::atomic_base<int>> = {
static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555f44d50},
d = 0x555555f44d50}}, <No data fields>}
uninstalledExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {
_q_value = {<std::atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555ef6100},
d = 0x555555ef6100}}, <No data fields>}
0000014 0x00007ffff7afbcbe in qSlicerApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:205
q = 0x7fffffffd8a0
generalPanel = 0x7fffffffd8c8
settingsModulesPanel = 0x555555ac4200
settingsStylesPanel = 0x2ffe47294c563000
settingsViewsPanel = 0x7fffffffd790
settingsUserPanel =
0x7ffff7b00efc <qGetPtrHelper<QScopedPointer<qSlicerCoreApplicationPrivate> >(QScopedPointer<qSlicerCoreApplicationPrivate, QScopedPointerDeleter<qSlicerCoreApplicationPrivate> > const&)+39>
settingsExtensionsPanel = 0x7fffffffd7c0
cachePanel = 0x7fffffffd8c8
developerPanel = 0x7fffffffda08
eventSource = 0x2ffe47294c563000
0000015 0x00007ffff7afcd10 in qSlicerApplication::qSlicerApplication (this=0x7fffffffd8a0, _argc=@0x7fffffffd85c: 1, _argv=0x7fffffffda08)
at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:359
d = 0x555555ac4200
d = <optimized out>
0000016 0x000055555555a8c9 in (anonymous namespace)::SlicerAppMain (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Applications/SlicerApp/Main.cxx:40
app = {<qSlicerCoreApplication> = {<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe48e9a80 <QApplication::staticMetaObject>,
stringdata = 0x7ffff716c0c0 <qt_meta_stringdata_qSlicerCoreApplication>, data = 0x7ffff716cd80 <qt_meta_data_qSlicerCoreApplication>,
static_metacall = 0x7ffff7144c08 <qSlicerCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void*)>, relatedMetaObjects = 0x0, extradata = 0x0}},
MyQVTK = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7fffef495fe0 <qt_meta_stringdata_ctkVTKObjectEventsObserver>, data = 0x7fffef496040 <qt_meta_data_ctkVTKObjectEventsObserver>,
static_metacall = 0x7fffef491246 <ctkVTKObjectEventsObserver::qt_static_metacall(QObject, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}},
d_ptr = {d = 0x555555e91060}}, d_ptr = {d = 0x555555ac4200}}, static staticMetaObject = {d = {superdata = 0x7ffff71d0420 <qSlicerCoreApplication::staticMetaObject>,
stringdata = 0x7ffff7bcde40 <qt_meta_stringdata_qSlicerApplication>, data = 0x7ffff7bce340 <qt_meta_data_qSlicerApplication>,
static_metacall = 0x7ffff7b9e9d6 <qSlicerApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
window = {d = 0x7fffdc602c48 <__internal_atexit+88>}
splashScreen = {d = 0x7fffffffd8c0}
0000017 0x000055555555abc1 in main (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Base/QTApp/qSlicerApplicationMainWrapper.cxx:56
No locals.
(gdb)
</pre>

I will try to work around this by doing as described in 0004125, i.e. trying Slicer_USE_SYSTEM_OpenSSL=OFF and/or Slicer_USE_PYTHONQT_WITH_OPENSSL=OFF.

There was a similar bug reported as 0004125, but it says that it has been fixed. This might be very similar.

Here is the gdb output from running SlicerApp-real:

<pre>
$ gdb Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
GNU gdb (Debian 8.1-4+b1) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real...done.
(gdb) run
Starting program: /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffc893c700 (LWP 16265)]
[New Thread 0x7fffc3a8a700 (LWP 16266)]

Thread 1 "SlicerApp-real" received signal SIGSEGV, Segmentation fault.
strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
31 /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) bt full
#0 strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
No locals.
0000001 0x00007fffef5cef1c in getrn () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000002 0x00007fffef5cf230 in lh_insert () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000003 0x00007fffef51e8f0 in OBJ_NAME_add () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000004 0x00007fffc30a7cbe in openssl_add_all_ciphers_int () at ./build_shared/../crypto/evp/c_allc.c:83
No locals.
0000005 0x00007fffc30c2829 in ossl_init_add_all_ciphers () at ./build_shared/../crypto/init.c:216
No locals.
0000006 ossl_init_add_all_ciphersossl () at ./build_shared/../crypto/init.c:205
No locals.
0000007 0x00007fffebea4827 in pthread_once_slow (once_control=0x7fffc321b7d4 <add_all_ciphers>, init_routine=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:116
_buffer = {routine = 0x7fffebea4880 <clear_once_control>, arg = 0x7fffc321b7d4 <add_all_ciphers>, canceltype = -11104, prev = 0x0}
val = <optimized out>
newval = <optimized out>
0000008 0x00007fffebea48e5 in GI_pthread_once (once_control=once_control@entry=0x7fffc321b7d4 <add_all_ciphers>,
init_routine=init_routine@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>) at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:143
val = <optimized out>
0000009 0x00007fffc312b329 in CRYPTO_THREAD_run_once (once=once@entry=0x7fffc321b7d4 <add_all_ciphers>, init=init@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at ./build_shared/../crypto/threads_pthread.c:113
No locals.
0000010 0x00007fffc30c2d63 in OPENSSL_init_crypto (opts=opts@entry=76, settings=0x0) at ./build_shared/../crypto/init.c:585
settings = 0x0
opts = 76
ret = <optimized out>
0000011 0x00007fffc2edacd4 in OPENSSL_init_ssl (opts=0, settings=<optimized out>) at ./build_shared/../ssl/ssl_init.c:197
stoperrset = 0
0000012 0x00007fffef378a80 in QSslSocketPrivate::ensureLibraryLoaded() () at ./src/network/ssl/qsslsocket_openssl11.cpp:94
locker = {val = 140737207174017}
0000013 0x00007ffff70e3f4f in qSlicerCoreApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTCore/qSlicerCoreApplication.cxx:271
q = 0x7fffffffd8a0
PRETTY_FUNCTION__ = "virtual void qSlicerCoreApplicationPrivate::init()"
appLauncherSettings = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7ffff71a2740 <qt_meta_stringdata_ctkAppLauncherSettings>, data = 0x7ffff71a2780 <qt_meta_data_ctkAppLauncherSettings>,
static_metacall = 0x7ffff71572dc <ctkAppLauncherSettings::qt_static_metacall(QObject*, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {
d = 0x555555efae80}}
envVars = {{d = 0x555555f47ae0, e = 0x555555f47ae0}}
pathsEnvVars = {{d = 0x555555f557f0, e = 0x555555f557f0}}
userInfo = 0x555555b649f0
scene = {Object = 0x2ffe47294c563000}
model = 0x2ffe47294c563000
updatedExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::atomic_base<int>> = {
static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555f44d50},
d = 0x555555f44d50}}, <No data fields>}
uninstalledExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {
_q_value = {<std::atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555ef6100},
d = 0x555555ef6100}}, <No data fields>}
0000014 0x00007ffff7afbcbe in qSlicerApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:205
q = 0x7fffffffd8a0
generalPanel = 0x7fffffffd8c8
settingsModulesPanel = 0x555555ac4200
settingsStylesPanel = 0x2ffe47294c563000
settingsViewsPanel = 0x7fffffffd790
settingsUserPanel =
0x7ffff7b00efc <qGetPtrHelper<QScopedPointer<qSlicerCoreApplicationPrivate> >(QScopedPointer<qSlicerCoreApplicationPrivate, QScopedPointerDeleter<qSlicerCoreApplicationPrivate> > const&)+39>
settingsExtensionsPanel = 0x7fffffffd7c0
cachePanel = 0x7fffffffd8c8
developerPanel = 0x7fffffffda08
eventSource = 0x2ffe47294c563000
0000015 0x00007ffff7afcd10 in qSlicerApplication::qSlicerApplication (this=0x7fffffffd8a0, _argc=@0x7fffffffd85c: 1, _argv=0x7fffffffda08)
at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:359
d = 0x555555ac4200
d = <optimized out>
0000016 0x000055555555a8c9 in (anonymous namespace)::SlicerAppMain (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Applications/SlicerApp/Main.cxx:40
app = {<qSlicerCoreApplication> = {<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe48e9a80 <QApplication::staticMetaObject>,
stringdata = 0x7ffff716c0c0 <qt_meta_stringdata_qSlicerCoreApplication>, data = 0x7ffff716cd80 <qt_meta_data_qSlicerCoreApplication>,
static_metacall = 0x7ffff7144c08 <qSlicerCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void*)>, relatedMetaObjects = 0x0, extradata = 0x0}},
MyQVTK = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7fffef495fe0 <qt_meta_stringdata_ctkVTKObjectEventsObserver>, data = 0x7fffef496040 <qt_meta_data_ctkVTKObjectEventsObserver>,
static_metacall = 0x7fffef491246 <ctkVTKObjectEventsObserver::qt_static_metacall(QObject, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}},
d_ptr = {d = 0x555555e91060}}, d_ptr = {d = 0x555555ac4200}}, static staticMetaObject = {d = {superdata = 0x7ffff71d0420 <qSlicerCoreApplication::staticMetaObject>,
stringdata = 0x7ffff7bcde40 <qt_meta_stringdata_qSlicerApplication>, data = 0x7ffff7bce340 <qt_meta_data_qSlicerApplication>,
static_metacall = 0x7ffff7b9e9d6 <qSlicerApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
window = {d = 0x7fffdc602c48 <__internal_atexit+88>}
splashScreen = {d = 0x7fffffffd8c0}
0000017 0x000055555555abc1 in main (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Base/QTApp/qSlicerApplicationMainWrapper.cxx:56
No locals.
(gdb)
</pre>

I will try to work around this by doing as described in 0004125, i.e. trying Slicer_USE_SYSTEM_OpenSSL=OFF and/or Slicer_USE_PYTHONQT_WITH_OPENSSL=OFF.

There was a similar bug reported as 0004125, but it says that it has been fixed. This might be very similar.

Here is the gdb output from running SlicerApp-real:

$ gdb Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
GNU gdb (Debian 8.1-4+b1) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real...done.
(gdb) run
Starting program: /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffc893c700 (LWP 16265)]
[New Thread 0x7fffc3a8a700 (LWP 16266)]

Thread 1 "SlicerApp-real" received signal SIGSEGV, Segmentation fault.
strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
31 /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) bt full
#0 strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
No locals.
0000001 0x00007fffef5cef1c in getrn () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000002 0x00007fffef5cf230 in lh_insert () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000003 0x00007fffef51e8f0 in OBJ_NAME_add () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000004 0x00007fffc30a7cbe in openssl_add_all_ciphers_int () at ./build_shared/../crypto/evp/c_allc.c:83
No locals.
0000005 0x00007fffc30c2829 in ossl_init_add_all_ciphers () at ./build_shared/../crypto/init.c:216
No locals.
0000006 ossl_init_add_all_ciphersossl () at ./build_shared/../crypto/init.c:205
No locals.
0000007 0x00007fffebea4827 in pthread_once_slow (once_control=0x7fffc321b7d4 <add_all_ciphers>, init_routine=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:116
_buffer = {routine = 0x7fffebea4880 <clear_once_control>, arg = 0x7fffc321b7d4 <add_all_ciphers>, canceltype = -11104, prev = 0x0}
val = <optimized out>
newval = <optimized out>
0000008 0x00007fffebea48e5 in GI_pthread_once (once_control=once_control@entry=0x7fffc321b7d4 <add_all_ciphers>,
init_routine=init_routine@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>) at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:143
val = <optimized out>
0000009 0x00007fffc312b329 in CRYPTO_THREAD_run_once (once=once@entry=0x7fffc321b7d4 <add_all_ciphers>, init=init@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at ./build_shared/../crypto/threads_pthread.c:113
No locals.
0000010 0x00007fffc30c2d63 in OPENSSL_init_crypto (opts=opts@entry=76, settings=0x0) at ./build_shared/../crypto/init.c:585
settings = 0x0
opts = 76
ret = <optimized out>
0000011 0x00007fffc2edacd4 in OPENSSL_init_ssl (opts=0, settings=<optimized out>) at ./build_shared/../ssl/ssl_init.c:197
stoperrset = 0
0000012 0x00007fffef378a80 in QSslSocketPrivate::ensureLibraryLoaded() () at ./src/network/ssl/qsslsocket_openssl11.cpp:94
locker = {val = 140737207174017}
0000013 0x00007ffff70e3f4f in qSlicerCoreApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTCore/qSlicerCoreApplication.cxx:271
q = 0x7fffffffd8a0
PRETTY_FUNCTION__ = "virtual void qSlicerCoreApplicationPrivate::init()"
appLauncherSettings = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7ffff71a2740 <qt_meta_stringdata_ctkAppLauncherSettings>, data = 0x7ffff71a2780 <qt_meta_data_ctkAppLauncherSettings>,
static_metacall = 0x7ffff71572dc <ctkAppLauncherSettings::qt_static_metacall(QObject*, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {
d = 0x555555efae80}}
envVars = {{d = 0x555555f47ae0, e = 0x555555f47ae0}}
pathsEnvVars = {{d = 0x555555f557f0, e = 0x555555f557f0}}
userInfo = 0x555555b649f0
scene = {Object = 0x2ffe47294c563000}
model = 0x2ffe47294c563000
updatedExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::atomic_base<int>> = {
static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555f44d50},
d = 0x555555f44d50}}, <No data fields>}
uninstalledExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {
_q_value = {<std::atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555ef6100},
d = 0x555555ef6100}}, <No data fields>}
0000014 0x00007ffff7afbcbe in qSlicerApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:205
q = 0x7fffffffd8a0
generalPanel = 0x7fffffffd8c8
settingsModulesPanel = 0x555555ac4200
settingsStylesPanel = 0x2ffe47294c563000
settingsViewsPanel = 0x7fffffffd790
settingsUserPanel =
0x7ffff7b00efc <qGetPtrHelper<QScopedPointer<qSlicerCoreApplicationPrivate> >(QScopedPointer<qSlicerCoreApplicationPrivate, QScopedPointerDeleter<qSlicerCoreApplicationPrivate> > const&)+39>
settingsExtensionsPanel = 0x7fffffffd7c0
cachePanel = 0x7fffffffd8c8
developerPanel = 0x7fffffffda08
eventSource = 0x2ffe47294c563000
0000015 0x00007ffff7afcd10 in qSlicerApplication::qSlicerApplication (this=0x7fffffffd8a0, _argc=@0x7fffffffd85c: 1, _argv=0x7fffffffda08)
at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:359
d = 0x555555ac4200
d = <optimized out>
0000016 0x000055555555a8c9 in (anonymous namespace)::SlicerAppMain (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Applications/SlicerApp/Main.cxx:40
app = {<qSlicerCoreApplication> = {<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe48e9a80 <QApplication::staticMetaObject>,
stringdata = 0x7ffff716c0c0 <qt_meta_stringdata_qSlicerCoreApplication>, data = 0x7ffff716cd80 <qt_meta_data_qSlicerCoreApplication>,
static_metacall = 0x7ffff7144c08 <qSlicerCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void*)>, relatedMetaObjects = 0x0, extradata = 0x0}},
MyQVTK = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7fffef495fe0 <qt_meta_stringdata_ctkVTKObjectEventsObserver>, data = 0x7fffef496040 <qt_meta_data_ctkVTKObjectEventsObserver>,
static_metacall = 0x7fffef491246 <ctkVTKObjectEventsObserver::qt_static_metacall(QObject, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}},
d_ptr = {d = 0x555555e91060}}, d_ptr = {d = 0x555555ac4200}}, static staticMetaObject = {d = {superdata = 0x7ffff71d0420 <qSlicerCoreApplication::staticMetaObject>,
stringdata = 0x7ffff7bcde40 <qt_meta_stringdata_qSlicerApplication>, data = 0x7ffff7bce340 <qt_meta_data_qSlicerApplication>,
static_metacall = 0x7ffff7b9e9d6 <qSlicerApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
window = {d = 0x7fffdc602c48 <__internal_atexit+88>}
splashScreen = {d = 0x7fffffffd8c0}
0000017 0x000055555555abc1 in main (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Base/QTApp/qSlicerApplicationMainWrapper.cxx:56
No locals.
(gdb)

I will try to work around this by doing as described in 0004125, i.e. trying Slicer_USE_SYSTEM_OpenSSL=OFF and/or Slicer_USE_PYTHONQT_WITH_OPENSSL=OFF.

There was a similar bug reported as 0004125, but it says that it has been fixed. This might be very similar.

Here is the gdb output from running SlicerApp-real:

<file>
$ gdb Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
GNU gdb (Debian 8.1-4+b1) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real...done.
(gdb) run
Starting program: /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffc893c700 (LWP 16265)]
[New Thread 0x7fffc3a8a700 (LWP 16266)]

Thread 1 "SlicerApp-real" received signal SIGSEGV, Segmentation fault.
strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
31 /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) bt full
#0 strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
No locals.
0000001 0x00007fffef5cef1c in getrn () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000002 0x00007fffef5cf230 in lh_insert () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000003 0x00007fffef51e8f0 in OBJ_NAME_add () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000004 0x00007fffc30a7cbe in openssl_add_all_ciphers_int () at ./build_shared/../crypto/evp/c_allc.c:83
No locals.
0000005 0x00007fffc30c2829 in ossl_init_add_all_ciphers () at ./build_shared/../crypto/init.c:216
No locals.
0000006 ossl_init_add_all_ciphersossl () at ./build_shared/../crypto/init.c:205
No locals.
0000007 0x00007fffebea4827 in pthread_once_slow (once_control=0x7fffc321b7d4 <add_all_ciphers>, init_routine=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:116
_buffer = {routine = 0x7fffebea4880 <clear_once_control>, arg = 0x7fffc321b7d4 <add_all_ciphers>, canceltype = -11104, prev = 0x0}
val = <optimized out>
newval = <optimized out>
0000008 0x00007fffebea48e5 in GI_pthread_once (once_control=once_control@entry=0x7fffc321b7d4 <add_all_ciphers>,
init_routine=init_routine@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>) at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:143
val = <optimized out>
0000009 0x00007fffc312b329 in CRYPTO_THREAD_run_once (once=once@entry=0x7fffc321b7d4 <add_all_ciphers>, init=init@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at ./build_shared/../crypto/threads_pthread.c:113
No locals.
0000010 0x00007fffc30c2d63 in OPENSSL_init_crypto (opts=opts@entry=76, settings=0x0) at ./build_shared/../crypto/init.c:585
settings = 0x0
opts = 76
ret = <optimized out>
0000011 0x00007fffc2edacd4 in OPENSSL_init_ssl (opts=0, settings=<optimized out>) at ./build_shared/../ssl/ssl_init.c:197
stoperrset = 0
0000012 0x00007fffef378a80 in QSslSocketPrivate::ensureLibraryLoaded() () at ./src/network/ssl/qsslsocket_openssl11.cpp:94
locker = {val = 140737207174017}
0000013 0x00007ffff70e3f4f in qSlicerCoreApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTCore/qSlicerCoreApplication.cxx:271
q = 0x7fffffffd8a0
PRETTY_FUNCTION__ = "virtual void qSlicerCoreApplicationPrivate::init()"
appLauncherSettings = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7ffff71a2740 <qt_meta_stringdata_ctkAppLauncherSettings>, data = 0x7ffff71a2780 <qt_meta_data_ctkAppLauncherSettings>,
static_metacall = 0x7ffff71572dc <ctkAppLauncherSettings::qt_static_metacall(QObject*, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {
d = 0x555555efae80}}
envVars = {{d = 0x555555f47ae0, e = 0x555555f47ae0}}
pathsEnvVars = {{d = 0x555555f557f0, e = 0x555555f557f0}}
userInfo = 0x555555b649f0
scene = {Object = 0x2ffe47294c563000}
model = 0x2ffe47294c563000
updatedExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::atomic_base<int>> = {
static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555f44d50},
d = 0x555555f44d50}}, <No data fields>}
uninstalledExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {
_q_value = {<std::atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555ef6100},
d = 0x555555ef6100}}, <No data fields>}
0000014 0x00007ffff7afbcbe in qSlicerApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:205
q = 0x7fffffffd8a0
generalPanel = 0x7fffffffd8c8
settingsModulesPanel = 0x555555ac4200
settingsStylesPanel = 0x2ffe47294c563000
settingsViewsPanel = 0x7fffffffd790
settingsUserPanel =
0x7ffff7b00efc <qGetPtrHelper<QScopedPointer<qSlicerCoreApplicationPrivate> >(QScopedPointer<qSlicerCoreApplicationPrivate, QScopedPointerDeleter<qSlicerCoreApplicationPrivate> > const&)+39>
settingsExtensionsPanel = 0x7fffffffd7c0
cachePanel = 0x7fffffffd8c8
developerPanel = 0x7fffffffda08
eventSource = 0x2ffe47294c563000
0000015 0x00007ffff7afcd10 in qSlicerApplication::qSlicerApplication (this=0x7fffffffd8a0, _argc=@0x7fffffffd85c: 1, _argv=0x7fffffffda08)
at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:359
d = 0x555555ac4200
d = <optimized out>
0000016 0x000055555555a8c9 in (anonymous namespace)::SlicerAppMain (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Applications/SlicerApp/Main.cxx:40
app = {<qSlicerCoreApplication> = {<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe48e9a80 <QApplication::staticMetaObject>,
stringdata = 0x7ffff716c0c0 <qt_meta_stringdata_qSlicerCoreApplication>, data = 0x7ffff716cd80 <qt_meta_data_qSlicerCoreApplication>,
static_metacall = 0x7ffff7144c08 <qSlicerCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void*)>, relatedMetaObjects = 0x0, extradata = 0x0}},
MyQVTK = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7fffef495fe0 <qt_meta_stringdata_ctkVTKObjectEventsObserver>, data = 0x7fffef496040 <qt_meta_data_ctkVTKObjectEventsObserver>,
static_metacall = 0x7fffef491246 <ctkVTKObjectEventsObserver::qt_static_metacall(QObject, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}},
d_ptr = {d = 0x555555e91060}}, d_ptr = {d = 0x555555ac4200}}, static staticMetaObject = {d = {superdata = 0x7ffff71d0420 <qSlicerCoreApplication::staticMetaObject>,
stringdata = 0x7ffff7bcde40 <qt_meta_stringdata_qSlicerApplication>, data = 0x7ffff7bce340 <qt_meta_data_qSlicerApplication>,
static_metacall = 0x7ffff7b9e9d6 <qSlicerApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
window = {d = 0x7fffdc602c48 <__internal_atexit+88>}
splashScreen = {d = 0x7fffffffd8c0}
0000017 0x000055555555abc1 in main (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Base/QTApp/qSlicerApplicationMainWrapper.cxx:56
No locals.
(gdb)
</file>

I will try to work around this by doing as described in 0004125, i.e. trying Slicer_USE_SYSTEM_OpenSSL=OFF and/or Slicer_USE_PYTHONQT_WITH_OPENSSL=OFF.

There was a similar bug reported as 0004125, but it says that it has been fixed. This might be very similar.

Here is the gdb output from running SlicerApp-real:

$ gdb Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
GNU gdb (Debian 8.1-4+b1) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real...done.
(gdb) run
Starting program: /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/Slicer-build/bin/SlicerApp-real
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffc893c700 (LWP 16265)]
[New Thread 0x7fffc3a8a700 (LWP 16266)]

Thread 1 "SlicerApp-real" received signal SIGSEGV, Segmentation fault.
strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
31 /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.
(gdb) bt full
#0 strcmp_sse2_unaligned () at /build/glibc-hBZSf0/glibc-2.27/string/../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:31
No locals.
0000001 0x00007fffef5cef1c in getrn () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000002 0x00007fffef5cf230 in lh_insert () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000003 0x00007fffef51e8f0 in OBJ_NAME_add () from /home/torquil/src/upstream/slicer/Slicer-Superbuild-Debug/OpenSSL/libcrypto.so.1.0.0
No symbol table info available.
0000004 0x00007fffc30a7cbe in openssl_add_all_ciphers_int () at ./build_shared/../crypto/evp/c_allc.c:83
No locals.
0000005 0x00007fffc30c2829 in ossl_init_add_all_ciphers () at ./build_shared/../crypto/init.c:216
No locals.
0000006 ossl_init_add_all_ciphersossl () at ./build_shared/../crypto/init.c:205
No locals.
0000007 0x00007fffebea4827 in pthread_once_slow (once_control=0x7fffc321b7d4 <add_all_ciphers>, init_routine=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:116
_buffer = {routine = 0x7fffebea4880 <clear_once_control>, arg = 0x7fffc321b7d4 <add_all_ciphers>, canceltype = -11104, prev = 0x0}
val = <optimized out>
newval = <optimized out>
0000008 0x00007fffebea48e5 in GI_pthread_once (once_control=once_control@entry=0x7fffc321b7d4 <add_all_ciphers>,
init_routine=init_routine@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>) at /build/glibc-hBZSf0/glibc-2.27/nptl/pthread_once.c:143
val = <optimized out>
0000009 0x00007fffc312b329 in CRYPTO_THREAD_run_once (once=once@entry=0x7fffc321b7d4 <add_all_ciphers>, init=init@entry=0x7fffc30c2820 <ossl_init_add_all_ciphersossl>)
at ./build_shared/../crypto/threads_pthread.c:113
No locals.
0000010 0x00007fffc30c2d63 in OPENSSL_init_crypto (opts=opts@entry=76, settings=0x0) at ./build_shared/../crypto/init.c:585
settings = 0x0
opts = 76
ret = <optimized out>
0000011 0x00007fffc2edacd4 in OPENSSL_init_ssl (opts=0, settings=<optimized out>) at ./build_shared/../ssl/ssl_init.c:197
stoperrset = 0
0000012 0x00007fffef378a80 in QSslSocketPrivate::ensureLibraryLoaded() () at ./src/network/ssl/qsslsocket_openssl11.cpp:94
locker = {val = 140737207174017}
0000013 0x00007ffff70e3f4f in qSlicerCoreApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTCore/qSlicerCoreApplication.cxx:271
q = 0x7fffffffd8a0
PRETTY_FUNCTION__ = "virtual void qSlicerCoreApplicationPrivate::init()"
appLauncherSettings = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7ffff71a2740 <qt_meta_stringdata_ctkAppLauncherSettings>, data = 0x7ffff71a2780 <qt_meta_data_ctkAppLauncherSettings>,
static_metacall = 0x7ffff71572dc <ctkAppLauncherSettings::qt_static_metacall(QObject*, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {
d = 0x555555efae80}}
envVars = {{d = 0x555555f47ae0, e = 0x555555f47ae0}}
pathsEnvVars = {{d = 0x555555f557f0, e = 0x555555f557f0}}
userInfo = 0x555555b649f0
scene = {Object = 0x2ffe47294c563000}
model = 0x2ffe47294c563000
updatedExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::atomic_base<int>> = {
static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555f44d50},
d = 0x555555f44d50}}, <No data fields>}
uninstalledExtensions = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {
_q_value = {<std::atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x555555ef6100},
d = 0x555555ef6100}}, <No data fields>}
0000014 0x00007ffff7afbcbe in qSlicerApplicationPrivate::init (this=0x555555ac4200) at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:205
q = 0x7fffffffd8a0
generalPanel = 0x7fffffffd8c8
settingsModulesPanel = 0x555555ac4200
settingsStylesPanel = 0x2ffe47294c563000
settingsViewsPanel = 0x7fffffffd790
settingsUserPanel =
0x7ffff7b00efc <qGetPtrHelper<QScopedPointer<qSlicerCoreApplicationPrivate> >(QScopedPointer<qSlicerCoreApplicationPrivate, QScopedPointerDeleter<qSlicerCoreApplicationPrivate> > const&)+39>
settingsExtensionsPanel = 0x7fffffffd7c0
cachePanel = 0x7fffffffd8c8
developerPanel = 0x7fffffffda08
eventSource = 0x2ffe47294c563000
0000015 0x00007ffff7afcd10 in qSlicerApplication::qSlicerApplication (this=0x7fffffffd8a0, _argc=@0x7fffffffd85c: 1, _argv=0x7fffffffda08)
at /home/torquil/src/upstream/slicer/Slicer/Base/QTGUI/qSlicerApplication.cxx:359
d = 0x555555ac4200
d = <optimized out>
0000016 0x000055555555a8c9 in (anonymous namespace)::SlicerAppMain (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Applications/SlicerApp/Main.cxx:40
app = {<qSlicerCoreApplication> = {<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe48e9a80 <QApplication::staticMetaObject>,
stringdata = 0x7ffff716c0c0 <qt_meta_stringdata_qSlicerCoreApplication>, data = 0x7ffff716cd80 <qt_meta_data_qSlicerCoreApplication>,
static_metacall = 0x7ffff7144c08 <qSlicerCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void*)>, relatedMetaObjects = 0x0, extradata = 0x0}},
MyQVTK = {<QObject> = {<No data fields>}, static staticMetaObject = {d = {superdata = 0x7fffe3d45a40 <QObject::staticMetaObject>,
stringdata = 0x7fffef495fe0 <qt_meta_stringdata_ctkVTKObjectEventsObserver>, data = 0x7fffef496040 <qt_meta_data_ctkVTKObjectEventsObserver>,
static_metacall = 0x7fffef491246 <ctkVTKObjectEventsObserver::qt_static_metacall(QObject, QMetaObject::Call, int, void)>, relatedMetaObjects = 0x0, extradata = 0x0}},
d_ptr = {d = 0x555555e91060}}, d_ptr = {d = 0x555555ac4200}}, static staticMetaObject = {d = {superdata = 0x7ffff71d0420 <qSlicerCoreApplication::staticMetaObject>,
stringdata = 0x7ffff7bcde40 <qt_meta_stringdata_qSlicerApplication>, data = 0x7ffff7bce340 <qt_meta_data_qSlicerApplication>,
static_metacall = 0x7ffff7b9e9d6 <qSlicerApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
window = {d = 0x7fffdc602c48 <__internal_atexit+88>}
splashScreen = {d = 0x7fffffffd8c0}
0000017 0x000055555555abc1 in main (argc=1, argv=0x7fffffffda08) at /home/torquil/src/upstream/slicer/Slicer/Base/QTApp/qSlicerApplicationMainWrapper.cxx:56
No locals.
(gdb)

I will try to work around this by doing as described in 0004125, i.e. trying Slicer_USE_SYSTEM_OpenSSL=OFF and/or Slicer_USE_PYTHONQT_WITH_OPENSSL=OFF.