Bug #12893: trunk fails on linux with clang on test with callcc

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.4.0dev (2016-11-03 trunk 56550) [x86_64-linux]
• Backport: 2.1: REQUIRED, 2.2: DONE, 2.3: DONE

[funny_falcon (Yura Sokolov)]

Test fails on linux with clang.
It doesn't fails with gcc.

OS: Ubuntu 16.04 x64_64
clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
configure: ../configure CC=clang CXX=clang++
test:

$ make test-all TESTS='-n /callcc/'
....
Run options: "--ruby=./miniruby -I../lib -I. -I.ext/common ../tool/runruby.rb --extout=.ext -- --disable-gems" --excludes-dir=../test/excludes --name=!/memory_leak/ -n /callcc/

Running tests:

[ 1/18] TestArray#test_combination_with_callcc/home/yura/Project/ruby-falcon/test/ruby/test_array.rb:948: [BUG] Segmentation fault at 0x00000000000012
ruby 2.4.0dev (2016-11-03 trunk 56550) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0027 p:---- s:0155 e:000154 CFUNC :callcc
c:0026 p:0016 s:0151 E:001310 BLOCK /home/yura/Project/ruby-falcon/test/ruby/test_array.rb:948 [FINISH]
c:0025 p:---- s:0148 e:000147 CFUNC :combination
c:0024 p:0038 s:0143 E:0021a0 METHOD /home/yura/Project/ruby-falcon/test/ruby/test_array.rb:947
c:0023 p:0036 s:0135 E:000110 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:1029
....
-- Ruby level backtrace information ----------------------------------------
....
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:1029:in run_test' /home/yura/Project/ruby-falcon/test/ruby/test_array.rb:947:in test_combination_with_callcc'
/home/yura/Project/ruby-falcon/test/ruby/test_array.rb:947:in combination' /home/yura/Project/ruby-falcon/test/ruby/test_array.rb:948:in block in test_combination_with_callcc'
/home/yura/Project/ruby-falcon/test/ruby/test_array.rb:948:in `callcc'

-- Machine register context ------------------------------------------------
RIP: 0x0000559aac7459b3 RBP: 0x00007ffd612aeb40 RSP: 0x00007ffd612aeaf0
RAX: 0x0000000000000001 RBX: 0x0000559ab4745a50 RCX: 0x00007ffd612aeb3f
RDX: 0x0000000000000002 RDI: 0x00007ffd612b1000 RSI: 0x0000559ab47765c0
R8: 0x00007fee67cc4b00 R9: 0x0000559aac744b00 R10: 0x00007fee67cc4b00
R11: 0x0000000000000020 R12: 0x0000000000000000 R13: 0x0000559ab4745a50
R14: 0x0000000000000000 R15: 0x0000559aad43b5c0 EFL: 0x0000000000010202

-- C level backtrace information -------------------------------------------
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_vm_bugreport+0x1cd) [0x559aac76652d] ../vm_dump.c:679
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_bug_context+0x1e6) [0x559aac759466] ../error.c:426
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(sigsegv+0x4f) [0x559aac67717f] ../signal.c:897
/lib/x86_64-linux-gnu/libpthread.so.0 [0x7fee678b93e0]
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(cont_capture+0x303) [0x559aac7459b3] ../cont.c:514
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_callcc+0xe) [0x559aac744dbe] ../cont.c:949
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_call_cfunc+0xf1) [0x559aac6e70c1] ../vm_insnhelper.c:1752
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec_core+0x27fe) [0x559aac6d0fee] ../insns.def:967
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec+0x9d) [0x559aac6e186d] ../vm.c:1711
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(invoke_block_from_c_splattable+0x158) [0x559aac6ef6d8] ../vm.c:1032
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_yield+0x8a) [0x559aac6dc62a] ../vm.c:1069
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(yield_indexed_values+0x197) [0x559aac708857] ../array.c:4970
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_ary_combination+0x3d7) [0x559aac704e47] ../array.c:5137
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_call_cfunc+0xf1) [0x559aac6e70c1] ../vm_insnhelper.c:1752
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec_core+0x27fe) [0x559aac6d0fee] ../insns.def:967
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec+0x9d) [0x559aac6e186d] ../vm.c:1711
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(invoke_block_from_c_splattable+0x158) [0x559aac6ef6d8] ../vm.c:1032
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_yield+0x8a) [0x559aac6dc62a] ../vm.c:1069
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_ary_collect+0x229) [0x559aac6ff5c9] ../array.c:2732

[funny_falcon (Yura Sokolov)]

Other segfault on TestMarshal#test_gc

$ make test-all TESTS='-n !/callcc/' # and I edited test/ruby/test_continuation.rb to no-op
        CC = clang
        LD = ld
        LDSHARED = clang -shared
        CFLAGS = -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wno-tautological-compare -Wno-parentheses-equality -Wno-constan
t-logical-operand -Wno-self-assign -Wunused-variable -Werror=implicit-int -Werror=pointer-arith -Werror=write-strings -Werror=declaration-after-statement -Werror=shorten-64-to-32 -Werror=implicit-function-de
claration -Werror=division-by-zero -Werror=deprecated-declarations -Werror=extra-tokens -std=gnu99 
        XCFLAGS = -D_FORTIFY_SOURCE=2 -fstack-protector -fno-strict-overflow -fvisibility=hidden -DRUBY_EXPORT -fPIE
        CPPFLAGS =   -I. -I.ext/include/x86_64-linux -I../include -I.. -I../enc/unicode/9.0.0
        DLDFLAGS = -Wl,--compress-debug-sections=zlib -fstack-protector -pie  
        SOLIBS = -lgmp 
clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/6.0.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
Run options: "--ruby=./miniruby -I../lib -I. -I.ext/common  ../tool/runruby.rb --extout=.ext  -- --disable-gems" --excludes-dir=../test/excludes --name=!/memory_leak/ -n !/callcc/

[ 9354/16782] TestMarshal#test_gc/home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:181: [BUG] Segmentation fault at 0x0000000000000c
ruby 2.4.0dev (2016-11-03 trunk 56550) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0029 p:---- s:0167 e:000166 CFUNC  :start
c:0028 p:0019 s:0163 e:000162 METHOD /home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:181 [FINISH]
c:0027 p:---- s:0158 e:000157 CFUNC  :dump
c:0026 p:0020 s:0153 e:000152 BLOCK  /home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:188
c:0025 p:0062 s:0150 e:000149 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit/assertions.rb:177
c:0024 p:0009 s:0139 e:000138 METHOD /home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:187
c:0023 p:0036 s:0135 e:000134 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:1029
c:0022 p:0078 s:0129 e:000128 METHOD /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1269
c:0021 p:0022 s:0120 e:000119 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit/testcase.rb:18
c:0020 p:0073 s:0115 e:000114 BLOCK  /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:941 [FINISH]
c:0019 p:---- s:0108 e:000107 CFUNC  :map
c:0018 p:0129 s:0104 E:001d80 METHOD /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:934
c:0017 p:0054 s:0092 E:0021b8 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:914
c:0016 p:0016 s:0085 E:001750 BLOCK  /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:494 [FINISH]
c:0015 p:---- s:0079 e:000078 CFUNC  :each
c:0014 p:0073 s:0075 E:000218 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:492
c:0013 p:0014 s:0068 E:0013f8 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:530
c:0012 p:0144 s:0061 E:001d88 METHOD /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:885
c:0011 p:0010 s:0050 E:000eb0 METHOD /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1096
c:0010 p:0010 s:0046 E:000e48 BLOCK  /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1083 [FINISH]
c:0009 p:---- s:0042 e:000041 CFUNC  :each
c:0008 p:0057 s:0038 E:000ce8 METHOD /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1082
c:0007 p:0020 s:0033 E:000608 METHOD /home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1070
c:0006 p:0012 s:0028 E:000000 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:682
c:0005 p:0022 s:0022 E:002598 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:33
c:0004 p:0045 s:0017 E:001f50 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:991
c:0003 p:0015 s:0013 E:001f08 METHOD /home/yura/Project/ruby-falcon/test/lib/test/unit.rb:995
c:0002 p:0304 s:0008 E:000ec8 EVAL   ../test/runner.rb:40 [FINISH]
c:0001 p:0000 s:0003 E:0026e0 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
../test/runner.rb:40:in `<main>'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:995:in `run'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:991:in `run'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:33:in `run'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:682:in `run'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1070:in `run'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1082:in `_run'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1082:in `each'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1083:in `block in _run'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1096:in `run_tests'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:885:in `_run_anything'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:530:in `_run_suites'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:492:in `_run_suites'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:492:in `each'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:494:in `block in _run_suites'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:914:in `_run_suite'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:934:in `_run_suite'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:934:in `map'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:941:in `block in _run_suite'
/home/yura/Project/ruby-falcon/test/lib/test/unit/testcase.rb:18:in `run'
/home/yura/Project/ruby-falcon/test/lib/minitest/unit.rb:1269:in `run'
/home/yura/Project/ruby-falcon/test/lib/test/unit.rb:1029:in `run_test'
/home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:187:in `test_gc'
/home/yura/Project/ruby-falcon/test/lib/test/unit/assertions.rb:177:in `assert_nothing_raised'
/home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:188:in `block in test_gc'
/home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:188:in `dump'
/home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:181:in `_dump'
/home/yura/Project/ruby-falcon/test/ruby/test_marshal.rb:181:in `start'

-- Machine register context ------------------------------------------------
 RIP: 0x00007feedcfcf4dc RBP: 0x0000558c05d8f9c0 RSP: 0x00007ffc2be3ac20
 RAX: 0x0000558c05d8ef20 RBX: 0x0000000000000001 RCX: 0x0000000000000004
 RDX: 0x0000000000000004 RDI: 0x0000000000000014 RSI: 0x0000000000000001
  R8: 0x0000558c08857780  R9: 0x0000000000000000 R10: 0x0000000000000003
 R11: 0x0000000000000000 R12: 0x0000000000000014 R13: 0x0000000000000000
 R14: 0x0000558c05d8f9c0 R15: 0x0000558c05fbea50 EFL: 0x0000000000010297

-- C level backtrace information -------------------------------------------
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_vm_bugreport+0x1cd) [0x558c04cd952d] ../vm_dump.c:679
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_bug_context+0x1e6) [0x558c04ccc466] ../error.c:426
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(sigsegv+0x4f) [0x558c04bea17f] ../signal.c:897
/lib/x86_64-linux-gnu/libpthread.so.0 [0x7feeddcea3e0]
/lib/x86_64-linux-gnu/libc.so.6(malloc_usable_size+0x1c) [0x7feedcfcf4dc] malloc.c:4584
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(obj_free+0x224) [0x558c04b345f4] ../gc.c:7678
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(gc_sweep_step+0x205) [0x558c04b33e15] ../gc.c:3451
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(gc_sweep+0xab) [0x558c04b3575b] ../gc.c:3671
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(gc_start+0x949) [0x558c04b338b9] ../gc.c:5602
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(garbage_collect+0xb4) [0x558c04b2be84] ../gc.c:6306
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(gc_start_internal+0x1c8) [0x558c04b30a58] ../gc.c:6623
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_call_cfunc+0xf1) [0x558c04c5a0c1] ../vm_insnhelper.c:1752
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec_core+0x2f1e) [0x558c04c4470e] ../insns.def:1066
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec+0x9d) [0x558c04c5486d] ../vm.c:1711
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_call0+0x17a) [0x558c04c6254a] ../vm_eval.c:61
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(w_object+0x3c2) [0x558c04b5de92] ../marshal.c:727
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(w_object+0x19ab) [0x558c04b5f47b] ../marshal.c:853
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_marshal_dump_limited+0x16d) [0x558c04b5d71d] ../marshal.c:1035
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(marshal_dump+0xff) [0x558c04b5d53f] ../marshal.c:1004
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_call_cfunc+0xf1) [0x558c04c5a0c1] ../vm_insnhelper.c:1752
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec_core+0x2f1e) [0x558c04c4470e] ../insns.def:1066
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec+0x9d) [0x558c04c5486d] ../vm.c:1711
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(invoke_block_from_c_splattable+0x158) [0x558c04c626d8] ../vm.c:1032
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_yield+0x8a) [0x558c04c4f62a] ../vm.c:1069
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_ary_collect+0x229) [0x558c04c725c9] ../array.c:2732
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_call_cfunc+0xf1) [0x558c04c5a0c1] ../vm_insnhelper.c:1752
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec_core+0x27fe) [0x558c04c43fee] ../insns.def:967
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec+0x9d) [0x558c04c5486d] ../vm.c:1711
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(invoke_block_from_c_splattable+0x158) [0x558c04c626d8] ../vm.c:1032
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_yield+0x8a) [0x558c04c4f62a] ../vm.c:1069
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_ary_each+0x29) [0x558c04c6c939] ../array.c:1823
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_call_cfunc+0xf1) [0x558c04c5a0c1] ../vm_insnhelper.c:1752
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec_core+0x27fe) [0x558c04c43fee] ../insns.def:967
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec+0x9d) [0x558c04c5486d] ../vm.c:1711
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(invoke_block_from_c_splattable+0x158) [0x558c04c626d8] ../vm.c:1032
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_yield+0x8a) [0x558c04c4f62a] ../vm.c:1069
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(rb_ary_each+0x29) [0x558c04c6c939] ../array.c:1823
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_call_cfunc+0xf1) [0x558c04c5a0c1] ../vm_insnhelper.c:1752
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec_core+0x27fe) [0x558c04c43fee] ../insns.def:967
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(vm_exec+0x9d) [0x558c04c5486d] ../vm.c:1711
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(ruby_run_node+0x138) [0x558c04b1ba28] ../eval.c:244
/home/yura/Project/ruby-falcon/.bld-clang~/ruby(main+0x4e) [0x558c04b1a16e] ../main.c:36

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

* Loaded script: ../test/runner.rb: TestMarshal#test_gc

.....

[nobu (Nobuyoshi Nakada)]

Seems related to segfaults on FreeBSD 11.
I tried with MacPorts clang 3.8.1, but it didn't reproduce.
Maybe clang 3.8.0's issue?

[hsbt (Hiroshi SHIBATA)]

FreeBSD failure log is here:

http://rubyci.org/logs/rubyci.s3.amazonaws.com/freebsd11zfs/ruby-trunk/log/20161104T063002Z.fail.html.gz

[shugo (Shugo Maeda)]

Reproduced on my FreeBSD box:

./ruby -r continuation -e 'cont = nil; ary = [1,2,3]; ary.combination(2) { callcc {|k| cont = k} unless cont }; cont.call'
ruby 2.4.0dev (2016-11-04 trunk 56558) [x86_64-freebsd11.0]

-- Control frame information -----------------------------------------------
c:0005 p:---- s:0020 e:000019 CFUNC  :callcc
c:0004 p:0016 s:0016 E:002420 BLOCK  -e:1 [FINISH]
c:0003 p:---- s:0013 e:000012 CFUNC  :combination
c:0002 p:0017 s:0008 E:001850 EVAL   -e:1 [FINISH]
c:0001 p:0000 s:0003 E:002700 (none) [FINISH]
...

In cont_capture(), cont is set to 0x1 after the context is restored.

    if (ruby_setjmp(cont->jmpbuf)) {
        /* cont is set to 0x1 here */

The following patch fixes the problem:

diff --git a/cont.c b/cont.c
index 8119b5c..79b685f 100644
--- a/cont.c
+++ b/cont.c
@@ -471,6 +471,9 @@ cont_new(VALUE klass)
 
 static VALUE
 cont_capture(volatile int *stat)
+#ifdef __clang__
+__attribute__ ((optnone))
+#endif
 {
     rb_context_t *cont;
     rb_thread_t *th = GET_THREAD();

[shugo (Shugo Maeda)]

Shugo Maeda wrote:

static VALUE
cont_capture(volatile int *stat)
+#ifdef clang
+attribute ((optnone))
+#endif

I'm not sure whether the version of clang should be checked as follows:

diff --git a/cont.c b/cont.c
index 8119b5c..85d3766 100644
--- a/cont.c
+++ b/cont.c
@@ -471,6 +471,10 @@ cont_new(VALUE klass)
 
 static VALUE
 cont_capture(volatile int *stat)
+#if defined(__clang__) && \
+    __clang_major__ == 3 && __clang_minor__ == 8 && __clang_patch__ == 0
+__attribute__ ((optnone))
+#endif
 {
     rb_context_t *cont;
     rb_thread_t *th = GET_THREAD();

[shugo (Shugo Maeda)]

• Status changed from Open to Closed

Applied in changeset r56561.

---

• cont.c (cont_new): disable optimization if clang's version is
  3.8.0. [ruby-core:77894] [Bug #12893]

[naruse (Yui NARUSE)]

NetBSD pkgsrc and FreeBSD ports were fixed by adding volatile.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206111

[shugo (Shugo Maeda)]

Yui NARUSE wrote:

NetBSD pkgsrc and FreeBSD ports were fixed by adding volatile.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206111

It seems to be a different issue.

I tried adding volatile to cont in cont_new(), but it didn't work.

[shugo (Shugo Maeda)]

• Backport changed from 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN to 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: REQUIRED, 2.2: REQUIRED, 2.3: DONE

ruby_2_3 r56717 merged revision(s) 56561.

[usa (Usaku NAKAMURA)]

• Backport changed from 2.1: REQUIRED, 2.2: REQUIRED, 2.3: DONE to 2.1: REQUIRED, 2.2: DONE, 2.3: DONE

ruby_2_2 r56730 merged revision(s) 56561.

[_dim (Dimitry Andric)]

Shugo Maeda wrote:

Yui NARUSE wrote:

NetBSD pkgsrc and FreeBSD ports were fixed by adding volatile.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206111

It seems to be a different issue.

I tried adding volatile to cont in cont_new(), but it didn't work.

Did you add it as volatile rb_context_t *cont, or as rb_context_t *volatile cont? Only the latter is correct.

Please refer to #13014 for the full patch set, including fix for cont_new().

[shugo (Shugo Maeda)]

Dimitry Andric wrote:

NetBSD pkgsrc and FreeBSD ports were fixed by adding volatile.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206111

It seems to be a different issue.

I tried adding volatile to cont in cont_new(), but it didn't work.

Did you add it as volatile rb_context_t *cont, or as rb_context_t *volatile cont? Only the latter is correct.

Please refer to #13014 for the full patch set, including fix for cont_new().

Adding the latter version to cont_capture() didn't work, but your full patch set did work.
Thank you!