Bug #7805: ruby 2.0rc2 core on solaris

• Status: Closed
• Priority: Normal
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: 2.6
• ruby -v: ruby 2.0.0dev (2013-02-08 trunk 39161) [i386-solaris2.10]

[[e-mail] (John Groenveld)]

$ env PATH=/usr/bin:/usr/sbin:/usr/ccs/bin:/opt/solarisstudio12.3/bin:/tmp/bin \
CC=cc CFLAGS="-m64 -O3" CXX=CC CXXFLAGS=-m64 CPPFLAGS="-I/opt/apache2/yaml/include -I/usr/sfw/include" \
LDFLAGS="-m64 -L/usr/sfw/lib/64 -R/usr/sfw/lib/64 -L/opt/apache2/yaml/lib -R/opt/apache2/yaml/lib" \
MAKE=gmake ./configure --prefix=/opt/apache2/ruby-1.9.3 --enable-shared --without-gcc

Generating RI format into /tmp/ruby-2.0.0-rc2/.ext/rdoc...
/tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:888: [BUG] Segmentation fault
ruby 2.0.0dev (2013-02-08 trunk 39161) [i386-solaris2.10]

-- Control frame information -----------------------------------------------
c:0016 p:---- s:0057 e:000056 CFUNC :dump
c:0015 p:0126 s:0053 e:000052 METHOD /tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:888
c:0014 p:0011 s:0045 e:000044 BLOCK /tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:750
c:0013 p:0008 s:0042 e:000041 BLOCK /tmp/ruby-2.0.0-rc2/lib/rdoc/context.rb:710 [FINISH]
c:0012 p:---- s:0039 e:000038 CFUNC :each
c:0011 p:0029 s:0036 e:000035 METHOD /tmp/ruby-2.0.0-rc2/lib/rdoc/context.rb:710
c:0010 p:0016 s:0033 e:000032 BLOCK /tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:749 [FINISH]
c:0009 p:---- s:0030 e:000029 CFUNC :each
c:0008 p:0015 s:0027 e:000026 METHOD /tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:746
c:0007 p:0009 s:0024 e:000023 METHOD /tmp/ruby-2.0.0-rc2/lib/rdoc/generator/ri.rb:26
c:0006 p:0057 s:0021 e:000020 BLOCK /tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb:526 [FINISH]
c:0005 p:---- s:0019 e:000018 CFUNC :chdir
c:0004 p:0018 s:0015 e:000014 METHOD /tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb:521
c:0003 p:0354 s:0012 e:000011 METHOD /tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb:504
c:0002 p:0049 s:0006 E:0002f8 EVAL ./bin/rdoc:20 [FINISH]
c:0001 p:0000 s:0002 E:0007a8 TOP [FINISH]

-- Ruby level backtrace information ----------------------------------------
./bin/rdoc:20:in <main>'
/tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb:504:indocument'
/tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb:521:in generate'
/tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb:521:inchdir'
/tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb:526:in block in generate'
/tmp/ruby-2.0.0-rc2/lib/rdoc/generator/ri.rb:26:ingenerate'
/tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:746:in save'
/tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:746:ineach'
/tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:749:in block in save'
/tmp/ruby-2.0.0-rc2/lib/rdoc/context.rb:710:ineach_method'
/tmp/ruby-2.0.0-rc2/lib/rdoc/context.rb:710:in each'
/tmp/ruby-2.0.0-rc2/lib/rdoc/context.rb:710:inblock in each_method'
/tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:750:in block (2 levels) in save'
/tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:888:insave_method'
/tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb:888:in `dump'

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

• Loaded script: ./bin/rdoc

• Loaded features:

  0 enumerator.so
  1 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/enc/encdb.so
  2 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/enc/trans/transdb.so
  3 /tmp/ruby-2.0.0-rc2/lib/rdoc.rb
  4 /tmp/ruby-2.0.0-rc2/lib/find.rb
  5 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/etc.so
  6 /tmp/ruby-2.0.0-rc2/lib/fileutils.rb
  7 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/pathname.so
  8 /tmp/ruby-2.0.0-rc2/.ext/common/pathname.rb
  9 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/date_core.so
  10 /tmp/ruby-2.0.0-rc2/.ext/common/date/format.rb
  11 /tmp/ruby-2.0.0-rc2/.ext/common/date.rb
  12 /tmp/ruby-2.0.0-rc2/lib/time.rb
  13 /tmp/ruby-2.0.0-rc2/rbconfig.rb
  14 /tmp/ruby-2.0.0-rc2/lib/rubygems/compatibility.rb
  15 /tmp/ruby-2.0.0-rc2/lib/rubygems/defaults.rb
  16 /tmp/ruby-2.0.0-rc2/lib/rubygems/deprecate.rb
  17 /tmp/ruby-2.0.0-rc2/lib/rubygems/errors.rb
  18 /tmp/ruby-2.0.0-rc2/lib/rubygems/version.rb
  19 /tmp/ruby-2.0.0-rc2/lib/rubygems/requirement.rb
  20 /tmp/ruby-2.0.0-rc2/lib/rubygems/platform.rb
  21 /tmp/ruby-2.0.0-rc2/lib/rubygems/specification.rb
  22 /tmp/ruby-2.0.0-rc2/lib/rubygems/exceptions.rb
  23 /tmp/ruby-2.0.0-rc2/lib/rubygems/core_ext/kernel_gem.rb
  24 /tmp/ruby-2.0.0-rc2/lib/rubygems/core_ext/kernel_require.rb
  25 /tmp/ruby-2.0.0-rc2/lib/rubygems.rb
  26 /tmp/ruby-2.0.0-rc2/lib/rubygems/path_support.rb
  27 /tmp/ruby-2.0.0-rc2/lib/cgi/util.rb
  28 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/strscan.so
  29 /tmp/ruby-2.0.0-rc2/lib/erb.rb
  30 /tmp/ruby-2.0.0-rc2/lib/rdoc/generator.rb
  31 /tmp/ruby-2.0.0-rc2/lib/rubygems/dependency.rb
  32 /tmp/ruby-2.0.0-rc2/.ext/common/json/version.rb
  33 /tmp/ruby-2.0.0-rc2/lib/ostruct.rb
  34 /tmp/ruby-2.0.0-rc2/.ext/common/json/generic_object.rb
  35 /tmp/ruby-2.0.0-rc2/.ext/common/json/common.rb
  36 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/enc/utf_16be.so
  37 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/enc/utf_16le.so
  38 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/enc/utf_32be.so
  39 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/enc/utf_32le.so
  40 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/json/ext/parser.so
  41 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/json/ext/generator.so
  42 /tmp/ruby-2.0.0-rc2/.ext/common/json/ext.rb
  43 /tmp/ruby-2.0.0-rc2/.ext/common/json.rb
  44 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup.rb
  45 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/formatter.rb
  46 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/to_joined_paragraph.rb
  47 /tmp/ruby-2.0.0-rc2/lib/rdoc/markdown/entities.rb
  48 /tmp/ruby-2.0.0-rc2/lib/rdoc/markdown/literals_1_9.rb
  49 /tmp/ruby-2.0.0-rc2/lib/rdoc/markdown.rb
  50 /tmp/ruby-2.0.0-rc2/lib/rdoc/rd.rb
  51 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/parser.rb
  52 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/pre_process.rb
  53 /tmp/ruby-2.0.0-rc2/lib/rdoc/tom_doc.rb
  54 /tmp/ruby-2.0.0-rc2/lib/rdoc/text.rb
  55 /tmp/ruby-2.0.0-rc2/lib/rdoc/code_object.rb
  56 /tmp/ruby-2.0.0-rc2/lib/rdoc/method_attr.rb
  57 /tmp/ruby-2.0.0-rc2/lib/cgi/core.rb
  58 /tmp/ruby-2.0.0-rc2/lib/cgi/cookie.rb
  59 /tmp/ruby-2.0.0-rc2/lib/cgi.rb
  60 /tmp/ruby-2.0.0-rc2/lib/rdoc/context.rb
  61 /tmp/ruby-2.0.0-rc2/lib/rdoc/class_module.rb
  62 /tmp/ruby-2.0.0-rc2/lib/rdoc/context/section.rb
  63 /tmp/ruby-2.0.0-rc2/lib/rdoc/top_level.rb
  64 /tmp/ruby-2.0.0-rc2/lib/rdoc/generator/markup.rb
  65 /tmp/ruby-2.0.0-rc2/lib/rdoc/generator/darkfish.rb
  66 /tmp/ruby-2.0.0-rc2/lib/rdoc/generator/ri.rb
  67 /tmp/ruby-2.0.0-rc2/lib/rdoc/rdoc.rb
  68 /tmp/ruby-2.0.0-rc2/lib/rdoc/store.rb
  69 /tmp/ruby-2.0.0-rc2/lib/optparse.rb
  70 /tmp/ruby-2.0.0-rc2/lib/rdoc/options.rb
  71 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/text.rb
  72 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/simple.rb
  73 /tmp/ruby-2.0.0-rc2/lib/tsort.rb
  74 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/c.rb
  75 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/changelog.rb
  76 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/markdown.rb
  77 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/rd.rb
  78 /tmp/ruby-2.0.0-rc2/lib/rdoc/ruby_token.rb
  79 /tmp/ruby-2.0.0-rc2/lib/rdoc/token_stream.rb
  80 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/ruby_tools.rb
  81 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser/ruby.rb
  82 /tmp/ruby-2.0.0-rc2/lib/rdoc/parser.rb
  83 /tmp/ruby-2.0.0-rc2/lib/rdoc/ri.rb
  84 /tmp/ruby-2.0.0-rc2/lib/rdoc/ri/paths.rb
  85 /tmp/ruby-2.0.0-rc2/lib/rdoc/stats.rb
  86 /tmp/ruby-2.0.0-rc2/lib/rdoc/stats/quiet.rb
  87 /tmp/ruby-2.0.0-rc2/lib/rdoc/stats/normal.rb
  88 /tmp/ruby-2.0.0-rc2/lib/rdoc/encoding.rb
  89 /tmp/ruby-2.0.0-rc2/lib/rdoc/comment.rb
  90 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/document.rb
  91 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/heading.rb
  92 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/blank_line.rb
  93 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/list.rb
  94 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/raw.rb
  95 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/paragraph.rb
  96 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/list_item.rb
  97 /tmp/ruby-2.0.0-rc2/lib/rdoc/known_classes.rb
  98 /tmp/ruby-2.0.0-rc2/lib/rdoc/normal_class.rb
  99 /tmp/ruby-2.0.0-rc2/lib/rdoc/any_method.rb
  100 /tmp/ruby-2.0.0-rc2/lib/rdoc/include.rb
  101 /tmp/ruby-2.0.0-rc2/lib/rdoc/alias.rb
  102 /tmp/ruby-2.0.0-rc2/lib/rdoc/normal_module.rb
  103 /tmp/ruby-2.0.0-rc2/lib/rdoc/constant.rb
  104 /tmp/ruby-2.0.0-rc2/lib/rdoc/attr.rb
  105 /tmp/ruby-2.0.0-rc2/lib/e2mmap.rb
  106 /tmp/ruby-2.0.0-rc2/lib/irb/output-method.rb
  107 /tmp/ruby-2.0.0-rc2/lib/irb/notifier.rb
  108 /tmp/ruby-2.0.0-rc2/lib/irb/slex.rb
  109 /tmp/ruby-2.0.0-rc2/.ext/i386-solaris2.10/stringio.so
  110 /tmp/ruby-2.0.0-rc2/lib/rdoc/ruby_lex.rb
  111 /tmp/ruby-2.0.0-rc2/lib/rdoc/require.rb
  112 /tmp/ruby-2.0.0-rc2/lib/rdoc/extend.rb
  113 /tmp/ruby-2.0.0-rc2/lib/rdoc/ghost_method.rb
  114 /tmp/ruby-2.0.0-rc2/lib/rdoc/meta_method.rb
  115 /tmp/ruby-2.0.0-rc2/lib/rdoc/markup/verbatim.rb

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.

$ pstack .ext/rdoc/core
core '.ext/rdoc/core' of 4987: ./ruby --disable-gems ./bin/rdoc --root . --page-dir ./doc --encoding=
----------------- lwp# 1 / thread# 1 --------------------
fffffd7ffef1351a _lwp_kill () + a
fffffd7ffeeb81b9 raise () + 19
fffffd7ffee96b80 abort () + 90
fffffd7fff0a6d90 rb_bug () + c0
fffffd7fff1643ee sigsegv () + 4e
fffffd7ffef0dd16 __sighndlr () + 6
fffffd7ffef025e2 call_user_handler () + 252
fffffd7ffef0280e sigacthandler (b, 5cfeb0, 5cfb50) + ee
--- called from signal handler with signal 11 (SIGSEGV) ---
fffffd7fff16dc66 st_lookup () + 16
fffffd7fff0dcada w_class () + 2a
fffffd7fff0ddd15 w_object () + ce5
fffffd7fff0ddfe9 marshal_dump () + 199
fffffd7fff1c8bad vm_call_cfunc_with_frame () + 34d
fffffd7fff1cdd88 vm_exec_core () + 2cc8
fffffd7fff1da39f vm_exec () + b0f
fffffd7fff1d8a80 invoke_block_from_c () + 4b0
fffffd7fff1d4f33 rb_yield () + 73
fffffd7fff073947 rb_ary_each () + 77
fffffd7fff1c8bad vm_call_cfunc_with_frame () + 34d
fffffd7fff1cde16 vm_exec_core () + 2d56
fffffd7fff1da39f vm_exec () + b0f
fffffd7fff1d8a80 invoke_block_from_c () + 4b0
fffffd7fff1d4f33 rb_yield () + 73
fffffd7fff073947 rb_ary_each () + 77
fffffd7fff1c8bad vm_call_cfunc_with_frame () + 34d
fffffd7fff1c9eb4 vm_call_method () + 3c4
fffffd7fff1cde16 vm_exec_core () + 2d56
fffffd7fff1da39f vm_exec () + b0f
fffffd7fff1d8a80 invoke_block_from_c () + 4b0
fffffd7fff1d4f33 rb_yield () + 73
fffffd7fff0acd09 rb_ensure () + 89
fffffd7fff099dd8 dir_s_chdir () + 118
fffffd7fff1c8bad vm_call_cfunc_with_frame () + 34d
fffffd7fff1c9eb4 vm_call_method () + 3c4
fffffd7fff1cde16 vm_exec_core () + 2d56
fffffd7fff1da39f vm_exec () + b0f
fffffd7fff0abaf5 ruby_exec_internal () + 95
fffffd7fff0abc0e ruby_exec_node () + 1e
fffffd7fff0abbd4 ruby_run_node () + 24
0000000000400dcc main () + 4c
0000000000400c1b ???????? ()
----------------- lwp# 2 / thread# 2 --------------------
fffffd7ffef1305a __pollsys () + a
fffffd7ffeeb98b4 pselect () + 154
fffffd7ffeeb9b82 select () + 72
fffffd7fff1e23ac thread_timer () + ac
fffffd7ffef0d9db _thr_setup () + 5b
fffffd7ffef0dc10 _lwp_start ()

[mame (Yusuke Endoh)]

• Status changed from Open to Assigned
• Assignee set to ngoto (Naohisa Goto)

[ngoto (Naohisa Goto)]

I couldn't reproduce it on SPARC Solaris10.

Please show config.log, .ext/include/i386-solaris2.10/ruby/config.h, and all messages shown in the screen.

[ngoto (Naohisa Goto)]

• Status changed from Assigned to Feedback

[mame (Yusuke Endoh)]

• Target version changed from 2.0.0 to 2.6

[ngoto (Naohisa Goto)]

• File marshal-c-volatile.patch marshal-c-volatile.patch added

--- called from signal handler with signal 11 (SIGSEGV) ---
fffffd7fff16dc66 st_lookup () + 16
fffffd7fff0dcada w_class () + 2a
fffffd7fff0ddd15 w_object () + ce5
fffffd7fff0ddfe9 marshal_dump () + 199

This may be re-occurrence of [Bug #7591] which is a GC issue.
How about the attached workaround patch?

[nobu (Nobuyoshi Nakada)]

It means RB_GC_GUARD() doesn't work well with Solaris CC?

[ngoto (Naohisa Goto)]

Sometimes RB_GC_GUARD() doesn't work well with Oracle SolarisStudio cc.
[Bug #5762] is another example.

[[e-mail] (John Groenveld)]

ngoto (Naohisa Goto) wrote:

--- called from signal handler with signal 11 (SIGSEGV) ---
fffffd7fff16dc66 st_lookup () + 16
fffffd7fff0dcada w_class () + 2a
fffffd7fff0ddd15 w_object () + ce5
fffffd7fff0ddfe9 marshal_dump () + 199

This may be re-occurrence of [Bug #7591] which is a GC issue.
How about the attached workaround patch?

Resolves the core with Solaris Studio, thank you.
John
[e-mail]

[kosaki (Motohiro KOSAKI)]

How about to add a pragma of optimization off?
e.g. #pragma opt 0 (rb_gc_guarded_ptr)

Don't work?

[[e-mail] (John Groenveld)]

kosaki (Motohiro KOSAKI) wrote:

How about to add a pragma of optimization off?
e.g. #pragma opt 0 (rb_gc_guarded_ptr)

Don't work?

No.
John
[e-mail]

[ngoto (Naohisa Goto)]

• Status changed from Feedback to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r39860.
John, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

• marshal.c (marshal_dump, marshal_load): workaround for segv on Intel Solaris compiled with Oracle SolarisStudio 12.3. Partly revert r38174. [Bug #7805]

[normalperson (Eric Wong)]

The following should work without RB_GC_GUARD nor volatile.
I plan to commit unless there are objections, I see no possible
way for a compiler to mess things up:

--- a/marshal.c
+++ b/marshal.c
@@ -950,7 +950,7 @@ marshal_dump(int argc, VALUE *argv)
     VALUE obj, port, a1, a2;
     int limit = -1;
     struct dump_arg *arg;
-    volatile VALUE wrapper;
+    VALUE wrapper; /* used to avoid memory leak in case of exception */

     port = Qnil;
     rb_scan_args(argc, argv, "12", &obj, &a1, &a2);
@@ -964,7 +964,7 @@ marshal_dump(int argc, VALUE *argv)
    else if (NIL_P(a1)) io_needed();
    else port = a1;
     }
-    RB_GC_GUARD(wrapper) = TypedData_Make_Struct(rb_cData, struct dump_arg, &dump_arg_data, arg);
+    wrapper = TypedData_Make_Struct(rb_cData, struct dump_arg, &dump_arg_data, arg);
     arg->dest = 0;
     arg->symbols = st_init_numtable();
     arg->data    = st_init_numtable();
@@ -993,8 +993,8 @@ marshal_dump(int argc, VALUE *argv)
    rb_io_write(arg->dest, arg->str);
    rb_str_resize(arg->str, 0);
     }
-    clear_dump_arg(arg);
-    RB_GC_GUARD(wrapper);
+    free_dump_arg(arg);
+    rb_gc_force_recycle(wrapper); /* also guards from premature GC */

     return port;
 }
@@ -1957,7 +1957,7 @@ marshal_load(int argc, VALUE *argv)
     VALUE port, proc;
     int major, minor, infection = 0;
     VALUE v;
-    volatile VALUE wrapper;
+    VALUE wrapper; /* used to avoid memory leak in case of exception */
     struct load_arg *arg;

     rb_scan_args(argc, argv, "11", &port, &proc);
@@ -1973,7 +1973,7 @@ marshal_load(int argc, VALUE *argv)
     else {
    io_needed();
     }
-    RB_GC_GUARD(wrapper) = TypedData_Make_Struct(rb_cData, struct load_arg, &load_arg_data, arg);
+    wrapper = TypedData_Make_Struct(rb_cData, struct load_arg, &load_arg_data, arg);
     arg->infection = infection;
     arg->src = port;
     arg->offset = 0;
@@ -2004,8 +2004,8 @@ marshal_load(int argc, VALUE *argv)

     if (!NIL_P(proc)) arg->proc = proc;
     v = r_object(arg);
-    clear_load_arg(arg);
-    RB_GC_GUARD(wrapper);
+    free_load_arg(arg);
+    rb_gc_force_recycle(wrapper); /* also guards from premature GC */

     return v;
 }

---

http://bogomips.org/ruby.git/patch/?id=e9f200e99

The following changes since commit 4d33c0e965a1ccce82f7e26a0ef21fef6bef3d2b:

• vm_insnhelper.c (vm_call_method): should check ci->me->flag of a refining method in case the method is private. [Bug #9452] (2014-02-13 14:44:41 +0000)

are available in the git repository at:

git://80x24.org/ruby.git marshal-force_recycle

for you to fetch changes up to e9f200e99bc58894971f51b41825b8fac8e28572:

marshal.c: use rb_gc_force_recycle for GC-safety (2014-02-14 09:46:54 +0000)

---

Eric Wong (1):
marshal.c: use rb_gc_force_recycle for GC-safety

marshal.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

[ngoto (Naohisa Goto)]

• Status changed from Closed to Open

Please completely revert r44994 and r45025.
r45025 partly reverts r44494 and cause regression.

[ngoto (Naohisa Goto)]

• Assignee changed from ngoto (Naohisa Goto) to nobu (Nobuyoshi Nakada)

[ngoto (Naohisa Goto)]

• Related to Bug #9523: marshal_dump and callcc causes SEGV added

[normalperson (Eric Wong)]

Sorry about the breakage. Instead of reverting completely and using
volatile again, we should try to make RB_GC_GUARD more correct/robust.

[normalperson (Eric Wong)]

Can you please try the following patch?

This is hopefully robust enough for all future compilers:
http://bogomips.org/ruby.git/patch?id=1b5d3c0b9d

--- a/gc.c
+++ b/gc.c
@@ -88,10 +88,14 @@
 #define rb_setjmp(env) RUBY_SETJMP(env)
 #define rb_jmp_buf rb_jmpbuf_t

-#if defined(HAVE_RB_GC_GUARDED_PTR) && HAVE_RB_GC_GUARDED_PTR
+#if defined(HAVE_RB_GC_GUARDED_PTR_VAL) && HAVE_RB_GC_GUARDED_PTR_VAL
+/* trick the compiler into thinking a external signal handler uses this */
+volatile VALUE rb_gc_guarded_val;
 volatile VALUE *
-rb_gc_guarded_ptr(volatile VALUE *ptr)
+rb_gc_guarded_ptr_val(volatile VALUE *ptr, VALUE val)
 {
+    rb_gc_guarded_val = val;
+
     return ptr;
 }
 #endif
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 55ea252..abd4b4b 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -515,12 +515,16 @@ static inline int rb_type(VALUE obj);
 static inline volatile VALUE *rb_gc_guarded_ptr(volatile VALUE *ptr) {return ptr;}
 #pragma optimize("", on)
 #else
-volatile VALUE *rb_gc_guarded_ptr(volatile VALUE *ptr);
-#define HAVE_RB_GC_GUARDED_PTR 1
+volatile VALUE *rb_gc_guarded_ptr_val(volatile VALUE *ptr, VALUE val);
+#define HAVE_RB_GC_GUARDED_PTR_VAL 1
+#define RB_GC_GUARD(v) (*rb_gc_guarded_ptr_val(&(v),(v)))
 #endif
 #define RB_GC_GUARD_PTR(ptr) rb_gc_guarded_ptr(ptr)
 #endif
+
+#ifndef RB_GC_GUARD
 #define RB_GC_GUARD(v) (*RB_GC_GUARD_PTR(&(v)))
+#endif

 #ifdef __GNUC__
 #define RB_UNUSED_VAR(x) x __attribute__ ((unused))

------------------------------8<---------------------------
If you prefer git pull:
git pull git://80x24.org/ruby.git gc-guard-harder-v2

Maybe my original idea works, too, but it is weaker, I think:
git pull git://80x24.org/ruby.git gc-guard-harder
http://bogomips.org/ruby.git/patch?id=ecc6f50ca

[nobu (Nobuyoshi Nakada)]

Seems better.
Let's try.

• Status changed from Open to Closed

Applied in changeset r45064.

---

gc.c: RB_GC_GUARD should be robust enough for any compiler

• include/ruby/ruby.h (RB_GC_GUARD): use rb_gc_guarded_ptr_val on non-GCC/MSC
• gc.c (rb_gc_guarded_ptr_val): rename and adjust argument. RB_GC_GUARD should be robust enough for any compiler. [Bug #7805]

[normalperson (Eric Wong)]

Thanks for taking a look, r45064