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bash-4.3# gdb /opt/rakudo/bin/moar
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Reading symbols from /opt/rakudo/bin/moar...done.
(gdb) run nqp.moarvm t/nqp/104-method-cache.t
Starting program: /opt/rakudo/bin/moar nqp.moarvm t/nqp/104-method-cache.t
[Thread debugging using libthread_db enabled]
1..16
ok 1 - calling a method found in cache
ok 2 - nqp::can on a method found in cache
ok 3 - nqp::can on a method not in cache
ok 4 - ...find_method is not called when the cache is authoritative
[New Thread 1 (LWP 1)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1 (LWP 1)]
0xfe90646c in strlen () from /lib/libc.so.1
(gdb) where
#0  0xfe90646c in strlen () from /lib/libc.so.1
#1  0xfe961bce in _ndoprnt () from /lib/libc.so.1
#2  0xfe964d8f in vsnprintf () from /lib/libc.so.1
#3  0xfeaaa29a in MVM_exception_throw_adhoc_free_va (tc=0x80628b8, waste=0x8046bac,
    messageFormat=0xfebd638c "Cannot find method '%s' on object of type %s", args=0x8046b8c "(\006\337\b") at src/core/exceptions.c:760
#4  0xfeaaa20d in MVM_exception_throw_adhoc_free (tc=0x80628b8, waste=0x8046bac, messageFormat=0xfebd638c "Cannot find method '%s' on object of type %s")
    at src/core/exceptions.c:742
#5  0xfeb3fca5 in die_over_missing_method (tc=0x80628b8, obj=0x827b990, name=0x8d1c830) at src/6model/6model.c:58
#6  0xfeb3ff69 in MVM_6model_find_method (tc=0x80628b8, obj=0x827b990, name=0x8d1c830, res=0x85ca860) at src/6model/6model.c:107
#7  0xfeab5d46 in MVM_interp_run (tc=0x80628b8, initial_invoke=0xfeba23fa <toplevel_initial_invoke>, invoke_data=0x84ea4b0) at src/core/interp.c:1830
#8  0xfeba252d in MVM_vm_run_file (instance=0x8062340, filename=0x8047e29 "nqp.moarvm") at src/moar.c:401
#9  0x080516e3 in main (argc=3, argv=0x8047d3c) at src/main.c:257
(gdb) list
125
126     #ifndef _WIN32
127     int main(int argc, char *argv[])
128     #else
129     int wmain(int argc, wchar_t *wargv[])
130     #endif
131     {
132         MVMInstance *instance;
133         const char  *input_file;
134         const char  *executable_name = NULL;
(gdb)