mgcaret/hexchat-mruby

Embedded MRuby for HexChat IRC Client

hexchat-mruby's Issues

Crash with MRuby 2.0.0+

After basic changes made to properly compile with MRuby 2.0.0+, loading a script does not work, with a SEGV in vm.c: mrb->c->stack[0] = recv;

1490                irep = proc->body.irep;
1491                pool = irep->pool;
1492                syms = irep->syms;
1493              }
1494            }
1495            mrb->c->stack[0] = recv;
1496            /* pop stackpos */
1497            mrb->c->stack = ci->stackent;
1498            pc = ci->pc;
1499            cipop(mrb);

The script runs, but crashes when returning from the C method implementing HexChat::Internal.load()

If the script file does not exist or a syntax error occurs, no crash occurs.

GDB output:

(4) [STDO/RITE]
00001 NODE_SCOPE:
00001   NODE_BEGIN:
00001     NODE_CALL(.):
00001       NODE_CONST STDOUT
00001       method='puts' (2710343)
00001       args:
00001         NODE_STR "loaded it!" len 10
irep 0x12fc710 nregs=4 nlocals=1 pools=1 syms=2 reps=0 iseq=13
file: /home/mg/.config/hexchat/mruby/test/test.rb
    1 000 OP_GETCONST   R1      :STDOUT
    1 003 OP_STRING     R2      L(0)    ; "loaded it!"
    1 006 OP_SEND       R1      :puts   1
    1 010 OP_RETURN     R1
    1 012 OP_STOP

loaded it!

Program received signal SIGSEGV, Segmentation fault.
0x00007fffdfda14c1 in mrb_vm_exec (mrb=0x136b6c0, proc=0x141a650, pc=0x7fffdfead3e6 <hexchat_mrb_lib+14342> "!")
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:1495
1495            mrb->c->stack[0] = recv;

Backtrace:

#0  0x00007fffdfda14c1 in mrb_vm_exec (mrb=0x136b6c0, proc=0x141a650, pc=0x7fffdfead3e6 <hexchat_mrb_lib+14342> "!")
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:1495
#1  0x00007fffdfd9e390 in mrb_vm_run (mrb=0x136b6c0, proc=0x13b0450, self=..., stack_keep=4)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:978
#2  0x00007fffdfdae9b9 in mrb_run (mrb=0x136b6c0, proc=0x13b0450, self=...)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:3007
#3  0x00007fffdfd9d0a1 in mrb_funcall_with_block (mrb=0x136b6c0, self=..., mid=2412, argc=2, argv=0x7fffffffb300, blk=...) at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:533
#4  0x00007fffdfd9c95a in mrb_funcall_with_block (mrb=0x136b6c0, self=..., mid=2412, argc=2, argv=0x7fffffffb300, blk=...) at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:439
#5  0x00007fffdfd9d124 in mrb_funcall_argv (mrb=0x136b6c0, self=..., mid=2412, argc=2, argv=0x7fffffffb300)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:543
#6  0x00007fffdfd9c7a9 in mrb_funcall (mrb=0x136b6c0, self=..., name=0x7fffdfeb1ce9 "mrb_command", argc=2)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:400
#7  0x00007fffdfd6c6ca in hex_mrb_command_eval (word=0x7fffffffb770, word_eol=0x7fffffffb660, mrb=0x136b6c0)
    at mruby.c:1162
#8  0x00000000004890c6 in plugin_hook_run (sess=0x770840, name=0x11fd570 "mrb", word=0x7fffffffb770, word_eol=0x7fffffffb660, attrs=0x0, type=1) at plugin.c:562
#9  0x0000000000489268 in plugin_emit_command (sess=0x770840, name=0x11fd570 "mrb", word=0x7fffffffb770, word_eol=0x7fffffffb660) at plugin.c:614
#10 0x000000000048808c in handle_command (sess=0x770840, cmd=0x1480301 "mrb load test/test.rb", check_spch=1)
    at outbound.c:4696
#11 0x00000000004883af in handle_user_input (sess=0x770840, text=0x1480300 "/mrb load test/test.rb", history=1, nocommand=0) at outbound.c:4830
#12 0x0000000000488417 in handle_multiline (sess=0x770840, cmd=0x1480300 "/mrb load test/test.rb", history=1, nocommand=0) at outbound.c:4842
#13 0x000000000043bb9a in mg_inputbox_cb (igad=0x7891e0, gui=0x6dbac0 <static_mg_gui>) at maingui.c:341
#14 0x00007ffff59c3add in g_closure_invoke () at /lib64/libgobject-2.0.so.0
#15 0x00007ffff59d6f43 in signal_emit_unlocked_R () at /lib64/libgobject-2.0.so.0
#16 0x00007ffff59df19f in g_signal_emitv () at /lib64/libgobject-2.0.so.0
#17 0x00007ffff77ca724 in gtk_binding_entry_activate () at /lib64/libgtk-x11-2.0.so.0
#18 0x00007ffff77cabe1 in binding_match_activate () at /lib64/libgtk-x11-2.0.so.0
#19 0x00007ffff77cae7f in gtk_bindings_activate_list () at /lib64/libgtk-x11-2.0.so.0
#20 0x00007ffff77cc00e in gtk_bindings_activate_event () at /lib64/libgtk-x11-2.0.so.0

Additional info:

(gdb) info args
mrb = 0x136b6c0
proc = 0x141a650
pc = 0x7fffdfead3e6 <hexchat_mrb_lib+14342> "!"

(gdb) info locals
m = {func_p = 1 '\001', {proc = 0x7fffdfd6a150 <hex_mrb_xi_load>, func = 0x7fffdfd6a150 <hex_mrb_xi_load>}}
ci = 0x1398ce0
recv = {value = {f = 4.9406564584124654e-324, p = 0x1, i = 1, sym = 1}, tt = MRB_TT_TRUE}
blk = {value = {f = 0, p = 0x0, i = 0, sym = 0}, tt = MRB_TT_FALSE}
argc = 1
bidx = 7
cls = 0x13b4680
pc0 = 0x7fffdfead3e2 <hexchat_mrb_lib+14338> ".\005\a\001!"
irep = 0x1442a80
pool = 0x1442ad0
syms = 0x1442db0
insn = 46 '.'
ai = 24
prev_jmp = 0x7fffffffb0e0
c_jmp = {impl = {{__jmpbuf = {16, 5813337038024502804, 1, 21360656, 140737488337600, 140737346363040, 
        5813337037661695508, 5813407631888641556}, __mask_was_saved = 0, __saved_mask = {__val = {140737488333600, 
          13873200, 498, 140737488333456, 0, 7338768, 140737488333504, 7371168, 4294968294, 4311744512, 0, 0, 
          7250832, 140737316412240, 7250832, 140737316412240}}}}}
a = 5
b = 7
c = 1 '\001'
mid = 665655
optable = {0x7fffdfd9e613 <mrb_vm_exec+306>, 0x7fffdfd9e65c <mrb_vm_exec+379>, 0x7fffdfd9e715 <mrb_vm_exec+564>, 
  0x7fffdfd9e7c6 <mrb_vm_exec+741>, 0x7fffdfd9e87e <mrb_vm_exec+925>, 0x7fffdfd9e93d <mrb_vm_exec+1116>, 
  0x7fffdfd9e978 <mrb_vm_exec+1175>, 0x7fffdfd9e9b3 <mrb_vm_exec+1234>, 0x7fffdfd9e9ee <mrb_vm_exec+1293>, 
  0x7fffdfd9ea29 <mrb_vm_exec+1352>, 0x7fffdfd9ea64 <mrb_vm_exec+1411>, 0x7fffdfd9ea9f <mrb_vm_exec+1470>, 
  0x7fffdfd9ead4 <mrb_vm_exec+1523>, 0x7fffdfd9eb09 <mrb_vm_exec+1576>, 0x7fffdfd9eba9 <mrb_vm_exec+1736>, 
  0x7fffdfd9ec72 <mrb_vm_exec+1937>, 0x7fffdfd9ed0e <mrb_vm_exec+2093>, 0x7fffdfd9eda0 <mrb_vm_exec+2239>, 
  0x7fffdfd9ee3c <mrb_vm_exec+2395>, 0x7fffdfd9eed8 <mrb_vm_exec+2551>, 0x7fffdfd9efb3 <mrb_vm_exec+2770>, 
  0x7fffdfd9f072 <mrb_vm_exec+2961>, 0x7fffdfd9f13c <mrb_vm_exec+3163>, 0x7fffdfd9f1ea <mrb_vm_exec+3337>, 
  0x7fffdfd9f2bd <mrb_vm_exec+3548>, 0x7fffdfd9f399 <mrb_vm_exec+3768>, 0x7fffdfd9f4a2 <mrb_vm_exec+4033>, 
  0x7fffdfd9f561 <mrb_vm_exec+4224>, 0x7fffdfd9f676 <mrb_vm_exec+4501>, 0x7fffdfd9f735 <mrb_vm_exec+4692>, 
  0x7fffdfd9f85c <mrb_vm_exec+4987>, 0x7fffdfd9f947 <mrb_vm_exec+5222>, 0x7fffdfd9fa79 <mrb_vm_exec+5528>, 
  0x7fffdfd9fbb4 <mrb_vm_exec+5843>, 0x7fffdfd9fc3e <mrb_vm_exec+5981>, 0x7fffdfd9fd30 <mrb_vm_exec+6223>, 
  0x7fffdfd9fe22 <mrb_vm_exec+6465>, 0x7fffdfd9ff35 <mrb_vm_exec+6740>, 0x7fffdfda0171 <mrb_vm_exec+7312>, 
  0x7fffdfda022c <mrb_vm_exec+7499>, 0x7fffdfda03f4 <mrb_vm_exec+7955>, 0x7fffdfda047d <mrb_vm_exec+8092>, 
  0x7fffdfda04e5 <mrb_vm_exec+8196>, 0x7fffdfda077b <mrb_vm_exec+8858>, 0x7fffdfda0aa3 <mrb_vm_exec+9666>, 
  0x7fffdfda0af9 <mrb_vm_exec+9752>, 0x7fffdfda0b4f <mrb_vm_exec+9838>, 0x7fffdfda0c93 <mrb_vm_exec+10162>, 
  0x7fffdfda15eb <mrb_vm_exec+12554>, 0x7fffdfda1a7f <mrb_vm_exec+13726>, 0x7fffdfda24f6 <mrb_vm_exec+16405>, 
  0x7fffdfda2bfb <mrb_vm_exec+18202>, 0x7fffdfda39c7 <mrb_vm_exec+21734>, 0x7fffdfda3b1d <mrb_vm_exec+22076>, 
  0x7fffdfda3798 <mrb_vm_exec+21175>, 0x7fffdfda3d49 <mrb_vm_exec+22632>, 0x7fffdfda3d12 <mrb_vm_exec+22577>, 
  0x7fffdfda3cdb <mrb_vm_exec+22522>, 0x7fffdfda4d4c <mrb_vm_exec+26731>, 0x7fffdfda4fe7 <mrb_vm_exec+27398>, 
  0x7fffdfda5e15 <mrb_vm_exec+31028>, 0x7fffdfda53dd <mrb_vm_exec+28412>, 0x7fffdfda6067 <mrb_vm_exec+31622>, 
  0x7fffdfda5760 <mrb_vm_exec+29311>, 0x7fffdfda5ae3 <mrb_vm_exec+30210>, 0x7fffdfda6220 <mrb_vm_exec+32063>, 
  0x7fffdfda65c6 <mrb_vm_exec+32997>, 0x7fffdfda68a5 <mrb_vm_exec+33732>, 0x7fffdfda6b84 <mrb_vm_exec+34467>, 
  0x7fffdfda6e63 <mrb_vm_exec+35202>, 0x7fffdfda7142 <mrb_vm_exec+35937>, 0x7fffdfda723a <mrb_vm_exec+36185>, 
  0x7fffdfda734b <mrb_vm_exec+36458>, 0x7fffdfda7440 <mrb_vm_exec+36703>, 0x7fffdfda74f3 <mrb_vm_exec+36882>, 
  0x7fffdfda7665 <mrb_vm_exec+37252>, 0x7fffdfda7809 <mrb_vm_exec+37672>, 0x7fffdfda78f7 <mrb_vm_exec+37910>, 
  0x7fffdfda7d24 <mrb_vm_exec+38979>, 0x7fffdfda7dfa <mrb_vm_exec+39193>, 0x7fffdfda7eee <mrb_vm_exec+39437>, 
  0x7fffdfda7fa1 <mrb_vm_exec+39616>, 0x7fffdfda812c <mrb_vm_exec+40011>, 0x7fffdfda82aa <mrb_vm_exec+40393>, 
  0x7fffdfda839f <mrb_vm_exec+40638>, 0x7fffdfda8526 <mrb_vm_exec+41029>, 0x7fffdfda857c <mrb_vm_exec+41115>, 
  0x7fffdfda85d2 <mrb_vm_exec+41201>, 0x7fffdfda86dc <mrb_vm_exec+41467>, 0x7fffdfda87e6 <mrb_vm_exec+41733>, 
  0x7fffdfda8876 <mrb_vm_exec+41877>, 0x7fffdfda8a8b <mrb_vm_exec+42410>, 0x7fffdfda8c58 <mrb_vm_exec+42871>, 
  0x7fffdfda8f50 <mrb_vm_exec+43631>, 0x7fffdfda91e9 <mrb_vm_exec+44296>, 0x7fffdfda92d1 <mrb_vm_exec+44528>, 
  0x7fffdfda9077 <mrb_vm_exec+43926>, 0x7fffdfda913a <mrb_vm_exec+44121>, 0x7fffdfda938b <mrb_vm_exec+44714>, 
  0x7fffdfda9439 <mrb_vm_exec+44888>, 0x7fffdfda9525 <mrb_vm_exec+45124>, 0x7fffdfdab253 <mrb_vm_exec+52594>, 
  0x7fffdfdacad1 <mrb_vm_exec+58864>, 0x7fffdfdae856 <mrb_vm_exec+66421>}
exc_catched = 0 '\000'
__PRETTY_FUNCTION__ = "mrb_vm_exec"

(gdb) bt full
#0  0x00007fffdfda14c1 in mrb_vm_exec (mrb=0x136b6c0, proc=0x141a650, pc=0x7fffdfead3e6 <hexchat_mrb_lib+14342> "!")
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:1495
        m = {func_p = 1 '\001', {proc = 0x7fffdfd6a150 <hex_mrb_xi_load>, func = 0x7fffdfd6a150 <hex_mrb_xi_load>}}
        ci = 0x1398ce0
        recv = {value = {f = 4.9406564584124654e-324, p = 0x1, i = 1, sym = 1}, tt = MRB_TT_TRUE}
        blk = {value = {f = 0, p = 0x0, i = 0, sym = 0}, tt = MRB_TT_FALSE}
        argc = 1
        bidx = 7
        cls = 0x13b4680
        pc0 = 0x7fffdfead3e2 <hexchat_mrb_lib+14338> ".\005\a\001!"
        irep = 0x1442a80
        pool = 0x1442ad0
        syms = 0x1442db0
        insn = 46 '.'
        ai = 24
        prev_jmp = 0x7fffffffb0e0
        c_jmp = 
                  {impl = {{__jmpbuf = {16, 5813337038024502804, 1, 21360656, 140737488337600, 140737346363040, 5813337037661695508, 5813407631888641556}, __mask_was_saved = 0, __saved_mask = {__val = {140737488333600, 13873200, 498, 140737488333456, 0, 7338768, 140737488333504, 7371168, 4294968294, 4311744512, 0, 0, 7250832, 140737316412240, 7250832, 140737316412240}}}}}
        a = 5
        b = 7
        c = 1 '\001'
        mid = 665655
        optable = 
          {0x7fffdfd9e613 <mrb_vm_exec+306>, 0x7fffdfd9e65c <mrb_vm_exec+379>, 0x7fffdfd9e715 <mrb_vm_exec+564>, 0x7fffdfd9e7c6 <mrb_vm_exec+741>, 0x7fffdfd9e87e <mrb_vm_exec+925>, 0x7fffdfd9e93d <mrb_vm_exec+1116>, 0x7fffdfd9e978 <mrb_vm_exec+1175>, 0x7fffdfd9e9b3 <mrb_vm_exec+1234>, 0x7fffdfd9e9ee <mrb_vm_exec+1293>, 0x7fffdfd9ea29 <mrb_vm_exec+1352>, 0x7fffdfd9ea64 <mrb_vm_exec+1411>, 0x7fffdfd9ea9f <mrb_vm_exec+1470>, 0x7fffdfd9ead4 <mrb_vm_exec+1523>, 0x7fffdfd9eb09 <mrb_vm_exec+1576>, 0x7fffdfd9eba9 <mrb_vm_exec+1736>, 0x7fffdfd9ec72 <mrb_vm_exec+1937>, 0x7fffdfd9ed0e <mrb_vm_exec+2093>, 0x7fffdfd9eda0 <mrb_vm_exec+2239>, 0x7fffdfd9ee3c <mrb_vm_exec+2395>, 0x7fffdfd9eed8 <mrb_vm_exec+2551>, 0x7fffdfd9efb3 <mrb_vm_exec+2770>, 0x7fffdfd9f072 <mrb_vm_exec+2961>, 0x7fffdfd9f13c <mrb_vm_exec+3163>, 0x7fffdfd9f1ea <mrb_vm_exec+3337>, 0x7fffdfd9f2bd <mrb_vm_exec+3548>, 0x7fffdfd9f399 <mrb_vm_exec+3768>, 0x7fffdfd9f4a2 <mrb_vm_exec+4033>, 0---Type <return> to continue, or q <return> to quit---
x7fffdfd9f561 <mrb_vm_exec+4224>, 0x7fffdfd9f676 <mrb_vm_exec+4501>, 0x7fffdfd9f735 <mrb_vm_exec+4692>, 0x7fffdfd9f85c <mrb_vm_exec+4987>, 0x7fffdfd9f947 <mrb_vm_exec+5222>, 0x7fffdfd9fa79 <mrb_vm_exec+5528>, 0x7fffdfd9fbb4 <mrb_vm_exec+5843>, 0x7fffdfd9fc3e <mrb_vm_exec+5981>, 0x7fffdfd9fd30 <mrb_vm_exec+6223>, 0x7fffdfd9fe22 <mrb_vm_exec+6465>, 0x7fffdfd9ff35 <mrb_vm_exec+6740>, 0x7fffdfda0171 <mrb_vm_exec+7312>, 0x7fffdfda022c <mrb_vm_exec+7499>, 0x7fffdfda03f4 <mrb_vm_exec+7955>, 0x7fffdfda047d <mrb_vm_exec+8092>, 0x7fffdfda04e5 <mrb_vm_exec+8196>, 0x7fffdfda077b <mrb_vm_exec+8858>, 0x7fffdfda0aa3 <mrb_vm_exec+9666>, 0x7fffdfda0af9 <mrb_vm_exec+9752>, 0x7fffdfda0b4f <mrb_vm_exec+9838>, 0x7fffdfda0c93 <mrb_vm_exec+10162>, 0x7fffdfda15eb <mrb_vm_exec+12554>, 0x7fffdfda1a7f <mrb_vm_exec+13726>, 0x7fffdfda24f6 <mrb_vm_exec+16405>, 0x7fffdfda2bfb <mrb_vm_exec+18202>, 0x7fffdfda39c7 <mrb_vm_exec+21734>, 0x7fffdfda3b1d <mrb_vm_exec+22076>, 0x7fffdfda3798 <mrb_vm_exec+21175>, 0x7fffdfda3d49 <mrb_vm_exec+22632>, 0x7fffdfda3d12 <mrb_vm_exec+22577>, 0x7fffdfda3cdb <mrb_vm_exec+22522>, 0x7fffdfda4d4c <mrb_vm_exec+26731>, 0x7fffdfda4fe7 <mrb_vm_exec+27398>, 0x7fffdfda5e15 <mrb_vm_exec+31028>, 0x7fffdfda53dd <mrb_vm_exec+28412>, 0x7fffdfda6067 <mrb_vm_exec+31622>, 0x7fffdfda5760 <mrb_vm_exec+29311>, 0x7fffdfda5ae3 <mrb_vm_exec+30210>, 0x7fffdfda6220 <mrb_vm_exec+32063>, 0x7fffdfda65c6 <mrb_vm_exec+32997>, 0x7fffdfda68a5 <mrb_vm_exec+33732>, 0x7fffdfda6b84 <mrb_vm_exec+34467>, 0x7fffdfda6e63 <mrb_vm_exec+35202>, 0x7fffdfda7142 <mrb_vm_exec+35937>, 0x7fffdfda723a <mrb_vm_exec+36185>, 0x7fffdfda734b <mrb_vm_exec+36458>, 0x7fffdfda7440 <mrb_vm_exec+36703>, 0x7fffdfda74f3 <mrb_vm_exec+36882>, 0x7fffdfda7665 <mrb_vm_exec+37252>, 0x7fffdfda7809 <mrb_vm_exec+37672>, 0x7fffdfda78f7 <mrb_vm_exec+37910>, 0x7fffdfda7d24 <mrb_vm_exec+38979>, 0x7fffdfda7dfa <mrb_vm_exec+39193>, 0x7fffdfda7eee <mrb_vm_exec+39437>, 0x7fffdfda7fa1 <mrb_vm_exec+39616>, 0x7fffdfda812c <mrb_vm_exec+40011>, 0x7fffdfda82aa <mrb_vm_exec+40393>, 0x7fffdfda839f <mrb_vm_exec+40638>, 0x7fffdfda8526 <mrb_vm_exec+41029>, 0x7fffdfda857c <mrb_vm_exec+41115>, 0x7fffdfda85d2 <mrb_vm_exec+41201>, 0x7fffdfda86dc <mrb_vm_exec+41467>, 0x7fffdfda87e6 <mrb_vm_exec+41733>, 0x7fffdfda8876 <mrb_vm_exec+41877>, 0x7fffdfda8a8b <mrb_vm_exec+42410>, 0x7fffdfda8c58 <mrb_vm_exec+42871>, 0x7fffdfda8f50 <mrb_vm_exec+43631>, 0x7fffdfda91e9 <mrb_vm_exec+44296>, 0x7fffdfda92d1 <mrb_vm_exec+44528>, 0x7fffdfda9077 <mrb_vm_exec+43926>, 0x7fffdfda913a <mrb_vm_exec+44121>, 0x7fffdfda938b <mrb_vm_exec+44714>, 0x7fffdfda9439 <mrb_vm_exec+44888>, 0x7fffdfda9525 <mrb_vm_exec+45124>, 0x7fffdfdab253 <mrb_vm_exec+52594>, 0x7fffdfdacad1 <mrb_vm_exec+58864>, 0x7fffdfdae856 <mrb_vm_exec+66421>}
        exc_catched = 0 '\000'
        __PRETTY_FUNCTION__ = "mrb_vm_exec"

#1  0x00007fffdfd9e390 in mrb_vm_run (mrb=0x136b6c0, proc=0x13b0450, self=..., stack_keep=4)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:978
        irep = 0x143eb20
        result = {value = {f = 4.2838179211549452e-317, p = 0x844d50, i = 8670544, sym = 8670544}, tt = 3112155648}
        c = 0x1316bf0
        cioff = 1
        nregs = 10

#2  0x00007fffdfdae9b9 in mrb_run (mrb=0x136b6c0, proc=0x13b0450, self=...)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:3007

#3  0x00007fffdfd9d0a1 in mrb_funcall_with_block (mrb=0x136b6c0, self=..., mid=2412, argc=2, argv=0x7fffffffb300, blk=...) at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:533
        m = {func_p = 0 '\000', {proc = 0x13b0450, func = 0x13b0450}}
        c = 0x13b4680
        ci = 0x1398c98
        n = 4
        voff = -1
        val = {value = {f = 1.0621399539144118e-316, p = 0x1480860, i = 21497952, sym = 21497952}, tt = 4117782481}

#4  0x00007fffdfd9c95a in mrb_funcall_with_block (mrb=0x136b6c0, self=..., mid=2412, argc=2, argv=0x7fffffffb300, blk=...) at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:439
        c_jmp = 
                  {impl = {{__jmpbuf = {16, 5813337038429253140, 1, 21360656, 140737488337600, 140737346363040, 5813337038357949972, 5813407631223189012}, __mask_was_saved = 0, __saved_mask = {__val = {21507104, 16, 21497760, 21504144, 1, 21497760, 140737311073406, 1, 21504168, 691, 140737342306101, 47266144400, 140736950115561, 21504144, 4294967987, 140737342301408}}}}}
        nth_ci = 0
        val = {value = {f = 1.0447891589375006e-316, p = 0x142ac90, i = 21146768, sym = 21146768}, tt = MRB_TT_ICLASS}

#5  0x00007fffdfd9d124 in mrb_funcall_argv (mrb=0x136b6c0, self=..., mid=2412, argc=2, argv=0x7fffffffb300)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:543

#6  0x00007fffdfd9c7a9 in mrb_funcall (mrb=0x136b6c0, self=..., name=0x7fffdfeb1ce9 "mrb_command", argc=2)
    at /home/mg/proj/hexchat-mruby/mruby/src/vm.c:400
        argv = 
    {{value = {f = 1.040490392566165e-316, p = 0x14158b0, i = 21059760, sym = 21059760}, tt = MRB_TT_ARRAY}, {value = {f = 1.0404809065057649e-316, p = 0x14157f0, i = 21059568, sym = 21059568}, tt = MRB_TT_ARRAY}, {value = {f = 6.9533558068658452e-310, p = 0x7fffffffb360, i = 140737488335712, sym = 4294947680}, tt = 3755565929}, {value = {f = 4.4614127819464563e-321, p = 0x387, i = 903, sym = 903}, tt = 64}, {value = {f = 0, p = 0x0, i = 0, sym = 0}, tt = 20362944}, {value = {f = 6.9533558068707858e-310, p = 0x7fffffffb3c4, i = 140737488335812, sym = 4294947780}, tt = 21501744}, {value = {f = 6.9533558068697977e-310, p = 0x7fffffffb3b0, i = 140737488335792, sym = 4294947760}, tt = 3755566059}, {value = {f = 6.9533558068729597e-310, p = 0x7fffffffb3f0, i = 140737488335856, sym = 4294947824}, tt = 64}, {value = {f = 0, p = 0x0, i = 0, sym = 0}, tt = 21059424}, {value = {f = 1.0060729891718305e-316, p = 0x136b788, i = 20363144, sym = 20363144}, tt = 20362944}, {value = {f = 6.9533558068745407e-310, p = 0x7fffffffb410, i = 140737488335888, sym = 4294947856}, tt = 3755569134}, {value = {f = 1.0404820922633149e-316, p = 0x1415808, i = 21059592, sym = 21059592}, tt = 20690352}, {value = {f = 3.3951932687064558e-313, p = 0x1000000040, i = 68719476800, sym = 64}, tt = 20362944}, {value = {f = 6.95
33558068761217e-310, p = 0x7fffffffb430, i = 140737488335920, sym = 4294947888}, tt = 21059424}, {value = {f = 1.0404809065057649e-316, p = 0x14157f0, i = 21059568, sym = 21059568}, tt = 20362944}, {value = {f = 6.9533558068761217e-310, p = 0x7fffffffb430, i = 140737488335920, sym = 4294947888}, tt = 3755445332}}
        ap = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7fffffffb4f0, reg_save_area = 0x7fffffffb410}}
        i = 2
        mid = 2412

#7  0x00007fffdfd6c6ca in hex_mrb_command_eval (word=0x7fffffffb770, word_eol=0x7fffffffb660, mrb=0x136b6c0)
    at mruby.c:1162
        rb_word = 
    {value = {f = 1.040490392566165e-316, p = 0x14158b0, i = 21059760, sym = 21059760}, tt = MRB_TT_ARRAY}
        rb_word_eol = 
    {value = {f = 1.0404809065057649e-316, p = 0x14157f0, i = 21059568, sym = 21059568}, tt = MRB_TT_ARRAY}
        hexchat_module = 0x13b46e0
        internal_class = 0x13b46b0
        c = 0x11cb620
        internal_class_v = 
    {value = {f = 1.0208352754170502e-316, p = 0x13b46b0, i = 20661936, sym = 20661936}, tt = MRB_TT_CLASS}
        mid = 2412
        cmd = 0x11fd574 "load"

#8  0x00000000004890c6 in plugin_hook_run (sess=0x770840, name=0x11fd570 "mrb", word=0x7fffffffb770, word_eol=0x7fffffffb660, attrs=0x0, type=1) at plugin.c:562
        list = 
          0x1215b70 = {0x145a8a0, 0x1222a70, 0x1222a30, 0x128b070, 0x1317b40, 0x1237b10, 0x1334930, 0x1338660, 0x1370350, 0x132f4d0, 0x12aa780, 0x1299880, 0x12467c0, 0x121f9c0, 0x1299900, 0x12998c0, 0x7078b0, 0x12a9140, 0x12a9180, 0x137af70, 0x137afb0, 0x1468410, 0x14683b0, 0x1468350, 0x14682f0, 0x14682b0, 0x1468250, 0x1468210, 0x14681d0, 0x1468190, 0x1468150, 0x1468110, 0x1467e20, 0x1467de0}
        next = 
          0x1215b00 = {0x1222a70, 0x1222a30, 0x128b070, 0x1317b40, 0x1237b10, 0x1334930, 0x1338660, 0x1370350, 0x132f4d0, 0x12aa780, 0x1299880, 0x12467c0, 0x121f9c0, 0x1299900, 0x12998c0, 0x7078b0, 0x12a9140, 0x12a9180, 0x137af70, 0x137afb0, 0x1468410, 0x14683b0, 0x1468350, 0x14682f0, 0x14682b0, 0x1468250, 0x1468210, 0x14681d0, 0x1468190, 0x1468150, 0x1468110, 0x1467e20, 0x1467de0}
        hook = 0x145a8a0
        ret = 32767
        eat = 0

#9  0x0000000000489268 in plugin_emit_command (sess=0x770840, name=0x11fd570 "mrb", word=0x7fffffffb770, word_eol=0x7fffffffb660) at plugin.c:614

#10 0x000000000048808c in handle_command (sess=0x770840, cmd=0x1480301 "mrb load test/test.rb", check_spch=1)
    at outbound.c:4696
        pop = 0x7ffff5707d31 <g_strdup+49>
        user_cmd = 0
        list = Python Exception <class 'gdb.MemoryError'> Cannot access memory at address 0x742f747365742064: 

#11 0x00000000004883af in handle_user_input (sess=0x770840, text=0x1480300 "/mrb load test/test.rb", history=1, nocommand=0) at outbound.c:4830

#12 0x0000000000488417 in handle_multiline (sess=0x770840, cmd=0x1480300 "/mrb load test/test.rb", history=1, nocommand=0) at outbound.c:4842
        cr = 0x1480316 ""
        end_of_string = 1

#13 0x000000000043bb9a in mg_inputbox_cb (igad=0x7891e0, gui=0x6dbac0 <static_mg_gui>) at maingui.c:341
        cmd = 0x1480300 "/mrb load test/test.rb"
        ignore = 0
        list = Python Exception <class 'gdb.MemoryError'> Cannot access memory at address 0x2474ad158d481f: 

x = {}; x[x] = x; x[x] crashes HexChat

Recursive reference eats all the stack, it doesn't play out well.

In mirb:

x = {}; x[x] = x; x[x]
/home/mg^/build/mruby-1.2.0/mrblib/array.rb:23: stack level too deep. (limit=(0x40000 - 128)) (SystemStackError)

Are you still working on this, or know an alternative?