NMAgentManager cannot register existing type segfault w/VirtualBox 6.1.x
This seems to be a common issue with VirtualBox 6.1.x builds and Slackware64-current, NetworkManager (1.28.0 at the moment, rather than 1.30.2), but here it is...
$ virtualbox
(process:18674): GLib-GObject-WARNING **: 22:51:46.139: cannot register existing type 'NMAgentManagerError'
(process:18674): GLib-CRITICAL **: 22:51:46.139: g_once_init_leave: assertion 'result != 0' failed
(process:18674): GLib-GObject-WARNING **: 22:51:46.139: cannot retrieve class for invalid (unclassed) type '<invalid>'
Thread 18 "UINetworkReplyP" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffc4d03640 (LWP 18724)]
0x00007fffe41bf0c2 in ?? () from /usr/lib64/libnm.so.0
(gdb) bt
#0 0x00007fffe41bf0c2 in () at /usr/lib64/libnm.so.0
#1 0x00007fffe41bf2d0 in () at /usr/lib64/libnm.so.0
#2 0x00007fffe418b237 in () at /usr/lib64/libnm.so.0
#3 0x00007ffff7fdd35e in call_init.part () at /lib64/ld-linux-x86-64.so.2
#4 0x00007ffff7fdd440 in _dl_init () at /lib64/ld-linux-x86-64.so.2