backtrace hidapi-testgui coredump after clicking 'Send Feature Report'

gistfile1.txt

$ doas egdb hidapi-testgui hidapi-testgui.core
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Reading symbols from hidapi-testgui...(no debugging symbols found)...done.
[New process 551058]
[New process 226179]
Core was generated by `hidapi-testgui'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000015cc9965547f in memcpy (dst0=0x15cc9f8be008, src0=0x7f7fffff2281, length=65535) at /usr/src/lib/libc/string/memcpy.c:97
97                      TLOOP1(*dst++ = *src++);
[Current thread is 1 (process 551058)]
(gdb) thread apply all bt

Thread 2 (process 226179):
#0  _thread_sys_poll () at -:3
#1  0x000015cc996285d4 in _libc_poll_cancel (fds=0x15cc5b80e2e0, nfds=1, timeout=60000) at /usr/src/lib/libc/sys/w_poll.c:27
#2  0x000015ccaad4a797 in handle_events () from /usr/local/lib/libusb-1.0.so.1.1
#3  0x000015ccaad4a334 in libusb_handle_events_timeout_completed () from /usr/local/lib/libusb-1.0.so.1.1
#4  0x000015ccaad4ab8d in libusb_handle_events () from /usr/local/lib/libusb-1.0.so.1.1
#5  0x000015cc18afa533 in read_thread () from /usr/local/lib/libhidapi.so.0.0
#6  0x000015cc2ba5c22e in _rthread_start (v=0xfc) at /usr/src/lib/librthread/rthread.c:96
#7  0x000015cc995e250b in __tfork_thread () at /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:75
#8  0x0000000000000000 in ?? ()

Thread 1 (process 551058):
#0  0x000015cc9965547f in memcpy (dst0=0x15cc9f8be008, src0=0x7f7fffff2281, length=65535) at /usr/src/lib/libc/string/memcpy.c:97
#1  0x000015ccaad4b323 in libusb_control_transfer () from /usr/local/lib/libusb-1.0.so.1.1
#2  0x000015cc18afa92a in hid_send_feature_report () from /usr/local/lib/libhidapi.so.0.0
#3  0x000015ca11c0265a in ?? ()
#4  0x000015cca25b6457 in FX::FXObject::tryHandle(FX::FXObject*, unsigned int, void*) () from /usr/local/lib/libFOX-1.6.so.2.1
#5  0x000015cca247aead in FX::FXButton::onLeftBtnRelease(FX::FXObject*, unsigned int, void*) () from /usr/local/lib/libFOX-1.6.so.2.1
#6  0x000015cca247a345 in FX::FXButton::handle(FX::FXObject*, unsigned int, void*) () from /usr/local/lib/libFOX-1.6.so.2.1
#7  0x000015cca24699b8 in FX::FXApp::dispatchEvent(_XEvent&) () from /usr/local/lib/libFOX-1.6.so.2.1
#8  0x000015cca246c697 in FX::FXApp::runOneEvent(bool) () from /usr/local/lib/libFOX-1.6.so.2.1
#9  0x000015cca246c56c in FX::FXApp::run() () from /usr/local/lib/libFOX-1.6.so.2.1
#10 0x000015ca11c02ce1 in ?? ()
#11 0x000015ca11c00846 in ?? ()
#12 0x0000000000000000 in ?? ()
(gdb)