Segmentation fault at raise exception

ruby-talk
1

I get segfault at any Ruby exception with C API:

(gdb) bt
#0 0x00007ffff58ebd78 in siglongjmp () from /lib/libc.so.6
#1 0x00007ffff719d3e7 in rb_longjmp (tag=6, mesg=6652280) at eval.c:442
#2 0x00007ffff719d422 in rb_exc_raise (mesg=6652280) at eval.c:453
#3 0x00007ffff719a380 in rb_raise (exc=6723760,
    fmt=0x7ffff72dc28c "no such file to load -- %s") at error.c:1172

It's caused because GET_THREAD()->tag equal to 0x0.

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2

Hi,

Could you show us the code? The interpreter may not be initialized
properly.

              matz.

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In message "Re: Segmentation fault at raise exception." on Sat, 24 Apr 2010 23:38:34 +0900, O01eg Oleg <o01eg@yandex.ru> writes:

I get segfault at any Ruby exception with C API:

(gdb) bt
#0 0x00007ffff58ebd78 in siglongjmp () from /lib/libc.so.6
#1 0x00007ffff719d3e7 in rb_longjmp (tag=6, mesg=6652280) at eval.c:442
#2 0x00007ffff719d422 in rb_exc_raise (mesg=6652280) at eval.c:453
#3 0x00007ffff719a380 in rb_raise (exc=6723760,
   fmt=0x7ffff72dc28c "no such file to load -- %s") at error.c:1172

It's caused because GET_THREAD()->tag equal to 0x0.

3

It's a initialization code:

  int ruby_argc = 1;
  char* ruby_argv[ruby_argc];
  ruby_argv[0] = "";
  char** r_argv = ruby_argv;
  Logger::Instance().Log(L"Ruby starting");
  ruby_sysinit(&ruby_argc, &r_argv);
  Logger::Instance().Log(L"Ruby: Call RUBY_INIT_STACK");
  RUBY_INIT_STACK;
  Logger::Instance().Log(L"Ruby: Call ruby_init");
  ruby_init();
  Logger::Instance().Log(L"Ruby: Call ruby_init_loadpath");
  ruby_init_loadpath();
  Logger::Instance().Log(L"Ruby started");

···

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4

Hi,

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In message "Re: Segmentation fault at raise exception." on Sun, 25 Apr 2010 00:33:39 +0900, O01eg Oleg <o01eg@yandex.ru> writes:

It's a initialization code:

int ruby_argc = 1;
char* ruby_argv[ruby_argc];
ruby_argv[0] = "";
char** r_argv = ruby_argv;
Logger::Instance().Log(L"Ruby starting");
ruby_sysinit(&ruby_argc, &r_argv);
Logger::Instance().Log(L"Ruby: Call RUBY_INIT_STACK");
RUBY_INIT_STACK;
Logger::Instance().Log(L"Ruby: Call ruby_init");
ruby_init();
Logger::Instance().Log(L"Ruby: Call ruby_init_loadpath");
ruby_init_loadpath();
Logger::Instance().Log(L"Ruby started");

Ah, I should have to say more clearly. Show us ALL of your code if
possible, to let us reproduce the problem.

              matz.

5

Here ALL my code: http://bin.mypage.sk/FILES/mud.tar.bz2

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6

Ok, now we have code. Next, how can we compile it?

Mere 'automake --add-missing' didn't work. I saw

  configure.ac:10: required file `configpkg.h.in' not found

In addition, when I run

  ./configure --includedir=/usr/lib/ruby/1.8/i486-linux

I didn't have AM_CHECK_RUBY, and configure failed to find <ruby.h>.

My version of automake was 1.11.1.

When we can compile it, then how can we run the program to reproduce
the problem?

              matz.

p.s.
I skim the code, you combined the interpreter with C++ code, C++
exceptions and threads, all of which are highly difficult to run
safely with the Ruby interpreter.

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In message "Re: Segmentation fault at raise exception." on Sun, 25 Apr 2010 00:48:06 +0900, O01eg Oleg <o01eg@yandex.ru> writes:

Here ALL my code: http://bin.mypage.sk/FILES/mud.tar.bz2

7

I use `autoreconf -fi`
AM_CHECK_RUBY places in m4/ruby.m4

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8

Hi,

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In message "Re: Segmentation fault at raise exception." on Sun, 25 Apr 2010 01:17:16 +0900, O01eg Oleg <o01eg@yandex.ru> writes:

I use `autoreconf -fi`
AM_CHECK_RUBY places in m4/ruby.m4

OK, compile was done. You have to wrap any ruby code execution
between PUSH_TAG and POP_TAG, or you can use rb_protect() function
instead.

              matz.

9

Thanks. Do I have to use this wrap for each thread which use ruby code?

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10

You have to wrap every call for Ruby related (possibly exception
raising) functions, e.g. rb_require, rb_eval_string, etc. And bad
news is that if you call ruby functions from different threads, they
might crash, since some (or most) of them are not thread-safe.

              matz.

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In message "Re: Segmentation fault at raise exception." on Sun, 25 Apr 2010 02:10:04 +0900, O01eg Oleg <o01eg@yandex.ru> writes:

Thanks. Do I have to use this wrap for each thread which use ruby code?

11

Yukihiro Matsumoto wrote:

You have to wrap every call for Ruby related (possibly exception
raising) functions, e.g. rb_require, rb_eval_string, etc.

Can I use

PUSH_TAG;
rb_requir(...)
rb_eval_string(...)
POP_TAG;

instead

PUSH_TAG;
rb_require(...)
POP_TAG;
PUSH_TAG;
rb_eval_string(...)
POP_TAG;

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12

Hi,

Can I use

PUSH_TAG;
rb_requir(...)
rb_eval_string(...)
POP_TAG;

Yes, but you have to do

    PUSH_TAG();
    if ((state = EXEC_TAG()) == 0) {
        rb_requir(...)
        rb_eval_string(...)
    }
    POP_TAG();

or use rb_protect utility function. My modified code was

static VALUE LoadFile0(VALUE filename)
{
  return rb_require((const char *)filename);
}

void Ruby::RubyImpl::LoadFile(const char *filename)
{
        int state;

  rb_protect(LoadFile0, (VALUE)filename, &state);
        // you can check state==0 for success.
}

              matz.

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In message "Re: Segmentation fault at raise exception." on Sun, 25 Apr 2010 02:23:22 +0900, O01eg Oleg <o01eg@yandex.ru> writes:

13

Thanks, it work.

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