Ruby » Ruby master

fix SEGV inspecting uninitialized objects

obj_info() assumes the given object is alive. OTOH
gc_writebarrier_incremental is called before or in middle of
object initialization. Can casue SEGV.

(lldb) run
Process 48188 launched: './miniruby' (x86_64)
Process 48188 stopped

• thread #1: tid = 0x30fd53, 0x00000001000bf7a9 minirubyrb_array_const_ptr(a=5251291222225483145) + 12 at ruby.h:2072, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT) frame #0: 0x00000001000bf7a9 minirubyrb_array_const_ptr(a=5251291222225483145) + 12 at ruby.h:2072
  2069 static inline const VALUE *
  2070 rb_array_const_ptr(VALUE a)
  2071 {
  -> 2072 return FIX_CONST_VALUE_PTR((RBASIC(a)->flags & RARRAY_EMBED_FLAG) ?
  2073 RARRAY(a)->as.ary : RARRAY(a)->as.heap.ptr);
  2074 }
  2075
  (lldb) bt
• thread #1: tid = 0x30fd53, 0x00000001000bf7a9 miniruby`rb_array_const_ptr(a=5251291222225483145) + 12 at ruby.h:2072, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
  • frame #0: 0x00000001000bf7a9 minirubyrb_array_const_ptr(a=5251291222225483145) + 12 at ruby.h:2072 frame #1: 0x00000001000bfaab minirubypathobj_path(pathobj=5251291222225483145) + 70 at vm_core.h:269
    frame #2: 0x00000001000c25ff minirubyrb_iseq_path(iseq=0x00000001025b71a8) + 32 at iseq.c:723 frame #3: 0x000000010009db09 minirubyrb_raw_iseq_info(buff="0x00000001025b7158 [0 ] proc (Proc)", buff_size=256, iseq=0x00000001025b71a8) + 69 at gc.c:9274
    frame #4: 0x000000010009e1d5 minirubyrb_raw_obj_info(buff="0x00000001025b7158 [0 ] proc (Proc)", buff_size=256, obj=4334514520) + 1546 at gc.c:9351 frame #5: 0x000000010009e4d5 minirubyobj_info(obj=4334514520) + 98 at gc.c:9429
    frame #6: 0x0000000100096658 minirubygc_writebarrier_incremental(a=4334514520, b=4334514600, objspace=0x00000001007d3280) + 61 at gc.c:5963 frame #7: 0x00000001000968ca minirubyrb_gc_writebarrier(a=4334514520, b=4334514600) + 127 at gc.c:6009
    frame #8: 0x00000001001eabe0 minirubyrb_obj_written(a=4334514520, oldv=52, b=4334514600, filename="/Users/urabe.shyouhei/data/src/pedantic/vm.c", line=821) + 72 at ruby.h:1472 frame #9: 0x00000001001eac2c minirubyrb_obj_write(a=4334514520, slot=0x000000010259ff10, b=4334514600, filename="/Users/urabe.shyouhei/data/src/pedantic/vm.c", line=821) + 70 at ruby.h:1489
    frame #10: 0x0000000100208b6f minirubyvm_proc_create_from_captured(klass=4311027960, captured=0x0000000102500338, block_type=block_type_ifunc, is_from_method='\0', is_lambda='\x01') + 137 at vm.c:821 frame #11: 0x0000000100208e5c minirubyrb_vm_make_proc_lambda(ec=0x00000001007d3548, captured=0x0000000102500338, klass=4311027960, is_lambda='\x01') + 134 at vm.c:892
    frame #12: 0x000000010011f08e minirubyproc_new(klass=4311027960, is_lambda='\x01') + 445 at proc.c:752 frame #13: 0x000000010011f110 minirubyrb_block_lambda + 27 at proc.c:808
    frame #14: 0x00000001001f24a7 minirubycall_cfunc_0(func=(minirubyrb_block_lambda at proc.c:807), recv=4310991600, argc=0, argv=0x0000000000000000) + 41 at vm_insnhelper.c:1729
    frame #15: 0x00000001002033de minirubyvm_call0_cfunc_with_frame(ec=0x00000001007d3548, calling=0x00007fff5fbfb080, ci=0x00007fff5fbfb070, cc=0x00007fff5fbfb0a0, argv=0x0000000000000000) + 370 at vm_eval.c:85 frame #16: 0x00000001002034d9 minirubyvm_call0_cfunc(ec=0x00000001007d3548, calling=0x00007fff5fbfb080, ci=0x00007fff5fbfb070, cc=0x00007fff5fbfb0a0, argv=0x0000000000000000) + 59 at vm_eval.c:100
    frame #17: 0x000000010020368f minirubyvm_call0_body(ec=0x00000001007d3548, calling=0x00007fff5fbfb080, ci=0x00007fff5fbfb070, cc=0x00007fff5fbfb0a0, argv=0x0000000000000000) + 436 at vm_eval.c:131 frame #18: 0x000000010020326a minirubyvm_call0(ec=0x00000001007d3548, recv=4310991600, id=2993, argc=0, argv=0x0000000000000000, me=0x0000000100f48110) + 142 at vm_eval.c:58
    frame #19: 0x0000000100203c60 minirubyrb_call0(ec=0x00000001007d3548, recv=4310991600, mid=2993, argc=0, argv=0x0000000000000000, scope=CALL_FCALL, self=4334514640) + 166 at vm_eval.c:296 frame #20: 0x0000000100204827 minirubyrb_call(recv=4310991600, mid=2993, argc=0, argv=0x0000000000000000, scope=CALL_FCALL) + 84 at vm_eval.c:589
    frame #21: 0x000000010020518b minirubyrb_funcallv(recv=4310991600, mid=2993, argc=0, argv=0x0000000000000000) + 52 at vm_eval.c:815 frame #22: 0x000000010012242e minirubymlambda(method=0) + 45 at proc.c:2661
    frame #23: 0x0000000100205bac minirubyrb_iterate0(it_proc=(minirubymlambda at proc.c:2660), data1=0, ifunc=0x00000001025b71a8, ec=0x00000001007d3548) + 380 at vm_eval.c:1134
    frame #24: 0x0000000100205d16 minirubyrb_iterate(it_proc=(minirubymlambda at proc.c:2660), data1=0, bl_proc=(minirubybmcall at proc.c:2666), data2=4334514640) + 88 at vm_eval.c:1166 frame #25: 0x00000001001224c7 minirubymethod_to_proc(method=4334514640) + 43 at proc.c:2701
    frame #26: 0x00000001001f24a7 minirubycall_cfunc_0(func=(minirubymethod_to_proc at proc.c:2688), recv=4334514640, argc=0, argv=0x0000000102400568) + 41 at vm_insnhelper.c:1729
    frame #27: 0x00000001001f2f87 minirubyvm_call_cfunc_with_frame(ec=0x00000001007d3548, reg_cfp=0x0000000102500350, calling=0x00007fff5fbfc030, ci=0x0000000100f2ec70, cc=0x0000000102735718) + 386 at vm_insnhelper.c:1918 frame #28: 0x00000001001f30d6 minirubyvm_call_cfunc(ec=0x00000001007d3548, reg_cfp=0x0000000102500350, calling=0x00007fff5fbfc030, ci=0x0000000100f2ec70, cc=0x0000000102735718) + 149 at vm_insnhelper.c:1934
    frame #29: 0x00000001001f4319 minirubyvm_call_method_each_type(ec=0x00000001007d3548, cfp=0x0000000102500350, calling=0x00007fff5fbfc030, ci=0x0000000100f2ec70, cc=0x0000000102735718) + 239 at vm_insnhelper.c:2232 frame #30: 0x00000001001f49a4 minirubyvm_call_method(ec=0x00000001007d3548, cfp=0x0000000102500350, calling=0x00007fff5fbfc030, ci=0x0000000100f2ec70, cc=0x0000000102735718) + 117 at vm_insnhelper.c:2355
    frame #31: 0x00000001001f4b7a minirubyvm_call_general(ec=0x00000001007d3548, reg_cfp=0x0000000102500350, calling=0x00007fff5fbfc030, ci=0x0000000100f2ec70, cc=0x0000000102735718) + 59 at vm_insnhelper.c:2398 frame #32: 0x00000001001faf0e minirubyvm_exec_core(ec=0x00000001007d3548, initial=0) + 8471 at insns.def:915
    frame #33: 0x000000010020b75d minirubyvm_exec(ec=0x00000001007d3548) + 230 at vm.c:1771 frame #34: 0x000000010020c3d1 minirubyrb_iseq_eval(iseq=0x00000001007f8270) + 52 at vm.c:2008
    frame #35: 0x00000001000caa4a minirubyrb_load_internal0(ec=0x00000001007d3548, fname=4310799960, wrap=0) + 631 at load.c:611 frame #36: 0x00000001000cab36 minirubyrb_load_internal(fname=4310799960, wrap=0) + 46 at load.c:642
    frame #37: 0x00000001000cae1d minirubyrb_f_load(argc=1, argv=0x00000001024004b8) + 217 at load.c:710 frame #38: 0x00000001001f247c minirubycall_cfunc_m1(func=(minirubyrb_f_load at load.c:695), recv=4311327440, argc=1, argv=0x00000001024004b8) + 47 at vm_insnhelper.c:1723 frame #39: 0x00000001001f2f87 minirubyvm_call_cfunc_with_frame(ec=0x00000001007d3548, reg_cfp=0x00000001025003e0, calling=0x00007fff5fbfd3e0, ci=0x0000000102541070, cc=0x0000000100f9e918) + 386 at vm_insnhelper.c:1918
    frame #40: 0x00000001001f30d6 minirubyvm_call_cfunc(ec=0x00000001007d3548, reg_cfp=0x00000001025003e0, calling=0x00007fff5fbfd3e0, ci=0x0000000102541070, cc=0x0000000100f9e918) + 149 at vm_insnhelper.c:1934 frame #41: 0x00000001001f4319 minirubyvm_call_method_each_type(ec=0x00000001007d3548, cfp=0x00000001025003e0, calling=0x00007fff5fbfd3e0, ci=0x0000000102541070, cc=0x0000000100f9e918) + 239 at vm_insnhelper.c:2232
    frame #42: 0x00000001001f4a2c minirubyvm_call_method(ec=0x00000001007d3548, cfp=0x00000001025003e0, calling=0x00007fff5fbfd3e0, ci=0x0000000102541070, cc=0x0000000100f9e918) + 253 at vm_insnhelper.c:2366 frame #43: 0x00000001001f4b7a minirubyvm_call_general(ec=0x00000001007d3548, reg_cfp=0x00000001025003e0, calling=0x00007fff5fbfd3e0, ci=0x0000000102541070, cc=0x0000000100f9e918) + 59 at vm_insnhelper.c:2398
    frame #44: 0x00000001001faf0e minirubyvm_exec_core(ec=0x00000001007d3548, initial=0) + 8471 at insns.def:915 frame #45: 0x000000010020b75d minirubyvm_exec(ec=0x00000001007d3548) + 230 at vm.c:1771
    frame #46: 0x000000010020c40f minirubyrb_iseq_eval_main(iseq=0x0000000100f21240) + 52 at vm.c:2019 frame #47: 0x000000010007c774 minirubyruby_exec_internal(n=0x0000000100f21240) + 297 at eval.c:246
    frame #48: 0x000000010007c89a minirubyruby_exec_node(n=0x0000000100f21240) + 36 at eval.c:310 frame #49: 0x000000010007c86d minirubyruby_run_node(n=0x0000000100f21240) + 62 at eval.c:302
    frame #50: 0x0000000100001399 minirubymain(argc=9, argv=0x00007fff5fbfdae0) + 113 at main.c:42 frame #51: 0x00007fff88eda5ad libdyld.dylibstart + 1
    (lldb)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61569 b2dd03c8-39d4-4d8f-98ff-823fe69b080e