Issue #6058 has been updated by Narihiro Nakamura. Motohiro KOSAKI wrote: > ??¹ã?¿ã????¯ã?ªã?¼ã????¼ã????ã?¼ã????¨ã??????????¯äºº??¯ã?????????ªã?®ã?§ã?????????????????????????¾ã??SEGV????³ã????©ã????¨å??è³?printf???????????¦ã?ªã????®ã??printf????????§ã?¹ã?¿ã????¯ã??çª??????´ã????ªã????¨è???????ªã???¦ã???????????????????ªã????»ã?»ã?¨æ?©ã????§ã?¾ã?????????????¾ã??第ä??å¼¾ã?¨ã?????ALT STACK??«ã??PROT_NONE??ªã?¹ã?¿ã????¯ã?¬ã?¼ã???????¼ã?¸ã???£ã?¤ã????¦ã?¹ã?¿ã????¯ã?ªã?¼ã????¼ã????ã?¼ã????¡ã?¢ã?ªç?´å????§ã?¯ã?ªã???¯ã?©ã????·ã?¥ã?«ã?ªã??????????«ã????¹ã????§ã??????????ã???????®ã????¨ã????½ã?¡ã????¨ã????®ã???????¯ã????¬ã?¼ã?¹ã?¿ã?¦ã?¹ã?¿ã????¯æ??è²»ã?®å??訳ã?????対ç??????????¾ã???????????å¼????????????¾ã?? ???????????¨ã?????????????¾ã??ï¼? gdb??®ã???????¯ã????¬ã?¼ã?¹ã?¯ä»¥ä¸???®ã?¨ã???????§ã????? (gdb) r -e 'Process.kill :SIGSEGV, $$' Starting program: /root/ruby/ruby-trunk-svn/miniruby -e 'Process.kill :SIGSEGV, $$' warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000 [Thread debugging using libthread_db enabled] [New Thread 0x40003940 (LWP 5991)] Program received signal SIGSEGV, Segmentation fault. 0x000000329b6306f7 in kill () from /lib64/libc.so.6 (gdb) c Continuing. -e:1: [BUG] Segmentation fault ruby 2.0.0dev (2012-02-22 trunk 34726) [x86_64-linux] -- Control frame information ----------------------------------------------- Program received signal SIGSEGV, Segmentation fault. 0x00002aaaae08d040 in ?? () (gdb) bt #0 0x00002aaaae08d040 in ?? () #1 0x00000000004e6304 in st_lookup (table=0x7f7a90, key=8368, value=0x7fa0e8) at st.c:399 #2 0x0000000000490077 in rb_id2str (id=8368) at parse.y:10612 #3 0x0000000000490159 in rb_id2name (id=8368) at parse.y:10643 #4 0x000000000053d893 in control_frame_dump (th=0x7f5520, cfp=0x2aaaae18ceb0) at vm_dump.c:121 #5 rb_vmdebug_stack_dump_raw (th=0x7f5520, cfp=0x2aaaae18ceb0) at vm_dump.c:182 #6 0x000000000053da6c in rb_vm_bugreport () at vm_dump.c:791 #7 0x00000000004446fe in report_bug (file=<value optimized out>, line=<value optimized out>, fmt=0x56a343 "Segmentation fault", args=0x7fa4d0) at error.c:266 #8 0x0000000000444878 in rb_bug (fmt=0x56a343 "Segmentation fault") at error.c:285 #9 0x00000000004df5d7 in sigsegv (sig=<value optimized out>, info=<value optimized out>, ctx=<value optimized out>) at signal.c:603 #10 <signal handler called> #11 0x000000329b6306f7 in kill () from /lib64/libc.so.6 #12 0x00000000004e049e in rb_f_kill (argc=2, argv=0x2aaaae08d048) at signal.c:397 #13 0x0000000000531720 in vm_call_cfunc (th=0x7f5520, cfp=0x2aaaae18cf08, num=<value optimized out>, blockptr=0x1, flag=0, id=8368, me=0x8ed620, recv=8698280) at vm_insnhelper.c:452 at vm_insnhelper.c:452 #14 vm_call_method (th=0x7f5520, cfp=0x2aaaae18cf08, num=<value optimized out>, blockptr=0x1, flag=0, id=8368, me=0x8ed620, recv=8698280) at vm_insnhelper.c:578 #15 0x00000000005345ef in vm_exec_core (th=0x7f5520, initial=<value optimized out>) at insns.def:1018 #16 0x0000000000539372 in vm_exec (th=0x7f5520) at vm.c:1223 #17 0x0000000000539601 in rb_iseq_eval_main (iseqval=8670360) at vm.c:1463 #18 0x0000000000447142 in ruby_exec_internal (n=0x844c98) at eval.c:204 #19 0x0000000000447169 in ruby_exec_node (n=0x844c98) at eval.c:251 #20 0x00000000004485cf in ruby_run_node (n=0x844c98) at eval.c:244 #21 0x0000000000415f63 in main (argc=3, argv=0x7fffffffe9e8) at main.c:38 ---------------------------------------- Bug #6058: Stack overflow in SEGV Handler https://bugs.ruby-lang.org/issues/6058 Author: Narihiro Nakamura Status: Assigned Priority: Normal Assignee: Motohiro KOSAKI Category: core Target version: 2.0.0 ruby -v: ruby 2.0.0dev (2012-02-22 trunk 34726) [x86_64-linux] nari??§ã????? 以ä????®ã???????«ã????¾ã??SEGV??®ã????¹ã????§è?½ã?¡ã???????¨ã??????????¾ã????¦ã?? http://c5664.rubyci.org/~chkbuild/ruby-trunk/log/20120221T130301Z.log.html.gz ?????????調æ?»ã???????¨ã????????SIGSEGV????³ã????©ã?®ä¸??§ã?¹ã?¿ã????¯ã?ªã?¼ã???????ã?¼ã????¦ã????? ????????§ã???????? # uname -orv 2.6.18-274.el5 #1 SMP Fri Jul 22 04:43:29 EDT 2011 GNU/Linux # cat /etc/redhat-release CentOS release 5.7 (Final) # ./miniruby -v ruby 2.0.0dev (2012-02-22 trunk 34726) [x86_64-linux] 64bit??°å?????CentOS??????100%????????¾ã???????? ./configure??®æ??å®????chkbuild??¨å???????«ã????¦ã????¾ã????? # gdb ./miniruby (gdb) r -e 'Process.kill :SIGSEGV, $$' Starting program: /root/ruby/ruby-trunk-svn/miniruby -e 'Process.kill :SIGSEGV, $$' warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000 [Thread debugging using libthread_db enabled] [New Thread 0x40003940 (LWP 5662)] Program received signal SIGSEGV, Segmentation fault. 0x000000329b6306f7 in kill () from /lib64/libc.so.6 (gdb) c Continuing. -e:1: [BUG] Segmentation fault ruby 2.0.0dev (2012-02-22 trunk 34726) [x86_64-linux] -- Control frame information ----------------------------------------------- Program received signal SIGSEGV, Segmentation fault. 0x00002aaaae08d040 in ?? () (gdb) up #1 0x00000000004e6304 in st_lookup (table=0x7f7a90, key=8368, value=0x7fa0e8) at st.c:399 399 hash_val = do_hash(key, table); (gdb) p table $1 = (st_table *) 0x7f7a90 (gdb) p *table $2 = {type = 0x2aaaae18cf08, num_bins = 217355419913, entries_packed = 0, num_entries = 1664379390147606789, bins = 0x2820766564302e30, head = 0x2d32302d32313032, tail = 0x6b6e757274203232} (gdb) up #2 0x0000000000490077 in rb_id2str (id=8368) at parse.y:10612 10612 if (st_lookup(global_symbols.id_str, id, &data)) { (gdb) p global_symbols.id_str $3 = (st_table *) 0x7f7a90 gdb??§èª¿??¹ã????¨ã??global_symbols.id_str???????????¡ã?¢ã?ªé??????????©ã???????§ç?´å???????? ??¦ã?????????????§ã???????? (gdb) (gdb) watch (((st_table *) 0x7f7a90)->type == 0x7d61f0) Hardware watchpoint 2: (((st_table *) 0x7f7a90)->type == 0x7d61f0) (gdb) r ... Old value = 1 New value = 0 0x000000329b642841 in vfprintf () from /lib64/libc.so.6 (gdb) info frame Stack level 0, Stack frame at 0x7f7aa0: rip = 0x329b642841 in vfprintf; saved rip 0x329b648086 called by frame at 0x7f9bf0 Arglist at 0x7f7a90, args: Locals at 0x7f7a90, Previous frame's sp is 0x7f7aa0 Saved registers: rbp at 0x7f7a90, rip at 0x7f7a98 対象??®ã?¡ã?¢ã?ªé??????????´å?????????????¹ã???¡Ö?????¨ã??vfprintf()??«è?????å½??????£ã?¦ã????¹ã?¿ã?? ??¯ã????¬ã?¼ã????®æ????±ã??è¦???????Locals??®ã?¢ã????¬ã?¹ã??global_symbols.id_str??®ã?¢ã????? ??¹ã?¨å???????«ã?ªã?£ã?¦ã??????????¨ã????????????¾ã???????? ??®ã?§ã???????¶ã????¹ã?¿ã????¯ã????ªã?¼ã???????ã?¼ã????¦ã???????®ã?§ã?¯ã?ªã???????¨æ???????¾ã????? ?????¾ã??詳ã??????ªã????®ã?§ã?¨ã????????????????°å?±å???????¦ã???????¾ã????? -- http://bugs.ruby-lang.org/