First, say 'run'. Let it crash. Then, say 'bt'. Ouch :) ... I feel thoroughly stupid now ;0 (gdb) bt #0 0x40051b6e in cl_inc_pointer_refcount (pointer=0x0) at object.h:205 #1 0x40057917 in cln::cl_gcobject::inc_pointer_refcount (this=0x4017d36c) at object.h:317 #2 0x400578ca in cln::cl_gcobject::_as_cl_private_thing (this=0x4017d36c) at object.h:501 #3 0x40057833 in as_cl_private_thing (x=@0x4017d36c) at object.h:506 #4 0x400589a3 in cl_FF (this=0x4017dad0, x=@0x4017d36c) at ffloat_class.h:72 #5 0x400cae5b in cln::cl_I_to_FF (x=@0xbffff3ac) at float/ffloat/elem/cl_FF_from_I.cc:34 #6 0x400cb0fb in cln::cl_RA_to_FF (x=@0xbffff3ac) at float/ffloat/elem/cl_FF_from_RA.cc:36 #7 0x4012f397 in __static_initialization_and_destruction_0 (__initialize_p=1, __priority=65535) at real/format-output/cl_fmt_scaleexp.cc:46 #8 0x4012fa28 in global constructors keyed to _ZN3cln21format_scale_exponentERKNS_4cl_FE () at real/format-output/cl_fmt_scaleexp.cc:331 #9 0x4013acb5 in __do_global_ctors_aux () from /home/andrej/source/cln_1.1.9/src/.libs/libcln.so.3 #10 0x40042629 in _init () from /home/andrej/source/cln_1.1.9/src/.libs/libcln.so.3 #11 0x4000aaae in call_init () from /lib/ld-linux.so.2 #12 0x4000a906 in _dl_init_internal () from /lib/ld-linux.so.2 #13 0x400007d5 in _dl_start_user () from /lib/ld-linux.so.2