Thread 16 (Thread 14376.0x3440):
#0  0x00007ff8adedfbe8 in ungetwc () from C:\Windows\System32\msvcrt.dll
#1  0x00007ff8aded8d51 in printf () from C:\Windows\System32\msvcrt.dll
#2  0x000000006a2e4b08 in bip_request_read (off=0x765f30c, size=0x765f38c, buffer=0x2c3a5b0) at C:/msys64/home/selwyn/portacle/all/quicklisp/local-projects/libmixed/src/bip.h:61
#3  0x000000006a2e515f in mixed_buffer_request_read (area=0x765f380, size=0x765f38c, buffer=0x2c3a5b0) at C:/msys64/home/selwyn/portacle/all/quicklisp/local-projects/libmixed/src/buffer.c:52
#4  0x000000006a2f2329 in drain_segment_mix (segment=0x2c94a70) at C:/msys64/home/selwyn/portacle/all/quicklisp/local-projects/libmixed/src/segments/packer.c:168
#5  0x000000006a2eacac in chain_segment_mix (segment=0x2c94ed0) at C:/msys64/home/selwyn/portacle/all/quicklisp/local-projects/libmixed/src/segments/chain.c:80
#6  0x000000006a2eacac in chain_segment_mix (segment=0x2c3f550) at C:/msys64/home/selwyn/portacle/all/quicklisp/local-projects/libmixed/src/segments/chain.c:80
#7  0x000000006a2e81a8 in mixed_segment_mix (segment=0x2c3f550) at C:/msys64/home/selwyn/portacle/all/quicklisp/local-projects/libmixed/src/segment.c:20
#8  0x000000100955f462 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)