gdb cfunc_test -c core

gistfile1.txt

$ gdb cfunc_test -c core.7700
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Reading symbols from /home/foo/build/mruby-cfunc/test/cfunc_test...done.
[New Thread 7700]
Missing separate debuginfo for
Try: yum --disablerepo='*' --enablerepo='*-debuginfo' install /usr/lib/debug/.build-id/b4/1d7cd75a11fc1c03b68d7f9a3ef1ea1edbf200
Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libm.so.6
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Core was generated by `././cfunc_test'.
Program terminated with signal 11, Segmentation fault.
#0  0x0000000000000000 in ?? ()
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.47.el6_2.12.x86_64
(gdb) up
#1  0x00000000004447a4 in ffi_call_unix64 () at ../src/x86/unix64.S:75
75              call    *%r11
(gdb) list
70
71              /* Deallocate the reg arg area.  */
72              leaq    176(%r10), %rsp
73
74              /* Call the user function.  */
75              call    *%r11
76
77              /* Deallocate stack arg area; local stack frame in redzone.  */
78              leaq    24(%rbp), %rsp
79
(gdb) up
#2  0x000000000044360a in ffi_call (cif=<value optimized out>, fn=0, rvalue=<value optimized out>, avalue=0x1692f40)
    at ../src/x86/ffi64.c:492
492       ffi_call_unix64 (stack, cif->bytes + sizeof (struct register_args),
(gdb) list
487                     }
488                 }
489             }
490         }
491
492       ffi_call_unix64 (stack, cif->bytes + sizeof (struct register_args),
493                        cif->flags, rvalue, fn, ssecount);
494     }
495
496
(gdb) info locals
classes = {X86_64_INTEGER_CLASS, X86_64_NO_CLASS, 814378624, 32661}
stack = 0x7fff160b3d20 "\n"
argp = 0x7fff160b3dd0 "\r\200"
arg_types = <value optimized out>
gprcount = 1
ssecount = <value optimized out>
ngpr = <value optimized out>
nsse = <value optimized out>
i = <value optimized out>
avn = 1
ret_in_memory = <value optimized out>
reg_args = 0x7fff160b3d20
(gdb) up
#3  0x000000000043a72b in cfunc_call (mrb=0x162c010, self=...) at cfunc_call.c:53
53              ffi_call(&cif, fp, result, values);
(gdb) info locals
result = 0x1692f60
margc = 1
mresult_type = {value = {f = 1.1491156654608215e-316, p = 0x162e4f8, i = 23258360, sym = 23258360}, tt = MRB_TT_CLASS}
mname = {value = {f = 1.1628309277893745e-316, p = 0x1672158, i = 23535960, sym = 23535960}, tt = MRB_TT_STRING}
margs = 0x1654ab0
dlh = <value optimized out>
fp = 0x0
args = 0x1692f20
values = 0x1692f40
to_pointer = 319
result_type = <value optimized out>
mresult = {value = {f = 0, p = 0x0, i = 0, sym = 0}, tt = MRB_TT_FALSE}
cif = {abi = FFI_UNIX64, nargs = 1, arg_types = 0x1692f20, rtype = 0x1685ac0, bytes = 0, flags = 32781}
(gdb)

Fixed