[ruby-core:54761] [ruby-trunk - Bug #8364][Open] Vim's if_ruby feature sometimes crash.

Issue #8364 has been reported by ynkdir (Yukihiro Nakadaira).

----------------------------------------
Bug #8364: Vim's if_ruby feature sometimes crash.
https://bugs.ruby-lang.org/issues/8364

Author: ynkdir (Yukihiro Nakadaira)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p0 (2013-02-24) [x86_64-darwin11.4.2]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


This problem was originally reported to vim-jp project.  See
https://github.com/vim-jp/issues/issues/372 (Japanese discussion).

Vim (http://www.vim.org/) is an text editor and it supports embedded
ruby interface so that we can customize Vim with Ruby.  On Mac, ruby
causes crash.

Steps to reproduce:
  $ vim
  :function! F()
  :  ruby nil
  :endfunction
  :call F()
  :ruby 10000.times { 'x' * 10000 }
  Vim: Caught deadly signal ABRT
  Vim: Finished.

Version is:
  Mac OS X 10.7.5
  ruby-2.0.0-p0
  Vim 7.3.918


Maybe the following is minimum C code to reproduce crash.

```c
/* rubyembed.c */
#include <ruby.h>

void rbinit() {
    int dummy_argc = 2;
    char *dummy_argv[] = {"foo", "-e0"};
    RUBY_INIT_STACK;
    ruby_init();
    ruby_process_options(dummy_argc, dummy_argv);
}

void rbexe(const char *src) {
    int state;
    rb_eval_string_protect(src, &state);
    if (state)
        ruby_error_print();
}

void init() {
    int eatstack[1024]; /* perhaps you need more to crash */
    rbinit();
}

int main(int argc, char **argv) {
    init();
    rbexe("10000.times { 'x' * 10000 }");
    return 0;
}
```

```sh
$ cd ~/tmp/ruby-2.0.0-p0
$ ./configure --prefix=$HOME/tmp/opt && make install
$ cc rubyembed.c -I$HOME/tmp/opt/include/ruby-2.0.0 -I$HOME/tmp/opt/include/ruby-2.0.0/x86_64-darwin11.4.2 -L$HOME/tmp/opt/lib -lruby-static
$ ./a.out
eval:1: [BUG] gc_sweep(): unknown data type 0x0(0x007fb2590651e0) 0x102000
ruby 2.0.0p0 (2013-02-24) [x86_64-darwin11.4.2]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/CrashReporter
     * /Library/Logs/CrashReporter
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   the more detail of.

-- Control frame information -----------------------------------------------
eval:1: [BUG] object allocation during garbage collection phase
ruby 2.0.0p0 (2013-02-24) [x86_64-darwin11.4.2]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/CrashReporter
     * /Library/Logs/CrashReporter
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   the more detail of.

-- Control frame information -----------------------------------------------
c:0005 p:---- s:0013 e:000012 CFUNC  :*
c:0004 p:0010 s:0009 e:000008 BLOCK  eval:1 [FINISH]
c:0003 p:---- s:0007 e:000006 CFUNC  :times
c:0002 p:0006 s:0004 e:000003 EVAL   eval:1 [FINISH]
c:0001 p:0000 s:0002 E:000d48 TOP    [FINISH]

eval:1:in `<main>'
eval:1:in `times'
eval:1:in `block in <main>'
eval:1:in `*'

-- C level backtrace information -------------------------------------------
0   a.out                               0x000000010dc0b02b rb_vm_bugreport + 251
1   a.out                               0x000000010daa7af8 report_bug + 392
2   a.out                               0x000000010daa7dff rb_bug + 207
3   a.out                               0x000000010dac89f9 newobj + 297
4   a.out                               0x000000010dac910f rb_newobj_of + 31
5   a.out                               0x000000010db942a4 str_new + 68
6   a.out                               0x000000010db957ee rb_usascii_str_new + 30
7   a.out                               0x000000010db13aeb rb_id2str + 107
8   a.out                               0x000000010db13cb9 rb_id2name + 9
9   a.out                               0x000000010dc0adbb control_frame_dump + 1035
10  a.out                               0x000000010dc0afcb rb_vm_bugreport + 155
11  a.out                               0x000000010daa7af8 report_bug + 392
12  a.out                               0x000000010daa7dff rb_bug + 207
13  a.out                               0x000000010dac4803 slot_sweep + 659
14  a.out                               0x000000010dac7dcf garbage_collect + 623
15  a.out                               0x000000010dac82e5 vm_xmalloc + 149
16  a.out                               0x000000010db943a3 str_new + 323
17  a.out                               0x000000010db96966 rb_str_times + 118
18  a.out                               0x000000010dbecad9 vm_call_cfunc_with_frame + 761
19  a.out                               0x000000010dbf21bd vm_exec_core + 14301
20  a.out                               0x000000010dbf79d1 vm_exec + 2673
21  a.out                               0x000000010dc061fb rb_yield + 507
22  a.out                               0x000000010daf7b1d int_dotimes + 61
23  a.out                               0x000000010dbecad9 vm_call_cfunc_with_frame + 761
24  a.out                               0x000000010dc04f5c vm_call_method + 828
25  a.out                               0x000000010dbf0b43 vm_exec_core + 8547
26  a.out                               0x000000010dbf79d1 vm_exec + 2673
27  a.out                               0x000000010dbf8305 eval_string_with_cref + 693
28  a.out                               0x000000010daaddd8 rb_protect + 232
29  a.out                               0x000000010da6694f rbexe + 31
30  a.out                               0x000000010da669b5 main + 37
31  a.out                               0x000000010da668c4 start + 52

-- Other runtime information -----------------------------------------------

* Loaded script: -e

* Loaded features:

    0 enumerator.so
    1 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/x86_64-darwin11.4.2/enc/encdb.bundle
    2 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/x86_64-darwin11.4.2/enc/trans/transdb.bundle
    3 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/x86_64-darwin11.4.2/rbconfig.rb
    4 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/compatibility.rb
    5 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/defaults.rb
    6 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/deprecate.rb
    7 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/errors.rb
    8 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/version.rb
    9 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/requirement.rb
   10 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/platform.rb
   11 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/specification.rb
   12 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/exceptions.rb
   13 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/core_ext/kernel_gem.rb
   14 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb
   15 /Users/yukihiro/tmp/opt/lib/ruby/2.0.0/rubygems.rb

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html
```



I am not sure that this is correct fix but above problem seems
disappeared with this.

```diff
diff --git a/thread_pthread.c b/thread_pthread.c
index 8953f5e..58b63b8 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -618,8 +618,10 @@ ruby_init_stack(volatile VALUE *addr
     )
 {
     native_main_thread.id = pthread_self();
-#ifdef STACK_END_ADDRESS
+#if defined(STACK_END_ADDRESS)
     native_main_thread.stack_start = STACK_END_ADDRESS;
+#elif defined(STACKADDR_AVAILABLE)
+    native_main_thread.stack_start = pthread_get_stackaddr_np(pthread_self());
 #else
     if (!native_main_thread.stack_start ||
         STACK_UPPER((VALUE *)(void *)&addr,
```


Or perhaps such code is not valid or something is wrong in Vim's if_ruby code?


-- 
http://bugs.ruby-lang.org/