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Bug #10871

Sclass thread unsafe due to CREF sharing

Added by evanphx (Evan Phoenix) over 4 years ago. Updated about 4 years ago.

Status:
Closed
Priority:
Normal
Target version:
-
ruby -v:
2.2.0p0, trunk
[ruby-core:68191]

Description

When entering an sclass, the context is tracked via the same cref mechanism used for class and module, specifically on the iseq->cref_stack. The bug is that the cref_stack is the wrong place to put the new cref because the scope is specific only to that sclass body. Mutating and using the iseq->cref_stack causes any code that reads the cref via this cref_stack to incorrectly pick up the sclass instance instead of the proper scope!

This is major thread safety bug because it means that all uses of class << obj are thread-unsafe and can cause random code to fail.

Here is a simple reproduction of the bug: https://gist.github.com/evanphx/6eef92f2c40662a4171b

I attempted to fix the bug by treating an sclass body the same as an eval, which already has special handling for cref's but I don't understand the code enough to make that change quickly.

I believe this is a major bug and hope that ruby-core can address it soon.

Thank you!

Associated revisions

Revision d93cfe5d
Added by nagachika (Tomoyuki Chikanaga) about 4 years ago

  • insns.def (defineclass): introduce an ad-hoc patch to avoid an issue reported on [Bug #10871].

This patch does not fix completely. For example, method definition
in a block (like 1.times{def ...; end}) still causes same issue.
To solve all, we need a huge patch and it seems difficult for
stable branch.

Use Ruby 2.3 and later to solve this issue completely.
(See [Bug #10943])

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@51673 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Revision 51673
Added by nagachika (Tomoyuki Chikanaga) about 4 years ago

  • insns.def (defineclass): introduce an ad-hoc patch to avoid an issue reported on [Bug #10871].

This patch does not fix completely. For example, method definition
in a block (like 1.times{def ...; end}) still causes same issue.
To solve all, we need a huge patch and it seems difficult for
stable branch.

Use Ruby 2.3 and later to solve this issue completely.
(See [Bug #10943])

History

Updated by tenderlovemaking (Aaron Patterson) over 4 years ago

I tried to fix this, but I can't figure it out. :(

I tried adding the singleton class to the stack frame. Since the stack frames are thread local, I thought that would at least fix the problem, but it didn't.

Here is the patch I tried:

https://gist.github.com/tenderlove/a8e30c1f764040de7536

I verified that putspecialobject 2 would put the right class on the stack, and I verified that m_core_define_method got the right class, but still your test failed. I don't understand what I'm doing wrong. :(

Updated by ko1 (Koichi Sasada) over 4 years ago

Deterministic example (avoiding non-deterministic).

class C
end
class D
end

$fibs = []
$xs = []

[C, D].each{|klass|
  klass.class_eval{
    $fibs << Fiber.new{
      class << self
        class X
          $xs << self
          CONST = $i
          def self.i
            CONST
          end

          def i
            CONST
          end
        end
      end
    }
  }
}

2.times{|i|
  $i = i
  $fibs[i].resume
}

$xs.each{|x|
  p [x::CONST, x.i, x.new.i]
}

To solve this issue, I will duplicate iseq (CREF holder) for sclass. I need to check other cases.

#3

Updated by clay@dabohealth.com (clay shentrup) over 4 years ago

Can anyone update us on the status of this bug? Thanks.

#4

Updated by ko1 (Koichi Sasada) over 4 years ago

I fixed this bug for 2.3 [Bug #10943] and ask to discuss for previous versions. But no discussions....

I will make workaround patch ONLY for this issue. That patch does not solve all of issue, but can solve this issue (this sample code).

Updated by evanphx (Evan Phoenix) over 4 years ago

Koichi, I think a workaround patch to be applied to 2.2 and 2.1 would be very useful.

Updated by glittershark (Griffin Smith) over 4 years ago

I also would very much like a backport of this, as it effectively makes certain bits of "idiomatic" ruby inherently (and very unexpectedly) completely thread-unsafe - see https://github.com/puma/puma/issues/647

Updated by mattbrictson (Matt Brictson) over 4 years ago

I recently opened bug #11153 which may be related. When using threads, methods defined inside class << obj sometimes fail to work. Feel free to close mine as a duplicate if it is the same underlying cause. In any case I would also appreciate a backport. :)

Updated by ko1 (Koichi Sasada) over 4 years ago

  • Assignee set to ko1 (Koichi Sasada)

Updated by ko1 (Koichi Sasada) over 4 years ago

This is an ad-hoc fix only for this issue.
Not complete fix. I wrote explanation about it in ChangeLog entry.

Index: insns.def
===================================================================
--- insns.def   (revision 50914)
+++ insns.def   (working copy)
@@ -914,6 +914,7 @@
 (VALUE val)
 {
     VALUE klass;
+    VALUE class_iseq_val = class_iseq->self;
     rb_vm_defineclass_type_t type = VM_DEFINECLASS_TYPE(flags);

     switch (type) {
@@ -963,7 +964,17 @@
       case VM_DEFINECLASS_TYPE_SINGLETON_CLASS:
    /* val is dummy.  classdef returns class scope value */
    /* super is dummy */
-   klass = rb_singleton_class(cbase);
+   {
+       klass = rb_singleton_class(cbase);
+
+       /* Copy iseq to duplicate cref_stack place.
+        * This is ad-hoc solution for [Bug #10871].
+        * and this does not solve more complicated source code with singleton class.
+        * If you need to solve everything, use Ruby 2.3 and later.
+        */
+       class_iseq_val = rb_iseq_clone(class_iseq->self, cbase);
+       GetISeqPtr(class_iseq_val, class_iseq);
+   }
    break;
       case VM_DEFINECLASS_TYPE_MODULE:
    /* val is dummy.  classdef returns class scope value */
@@ -998,6 +1009,9 @@
          klass, 0, VM_ENVVAL_BLOCK_PTR(GET_BLOCK_PTR()),
          class_iseq->iseq_encoded, GET_SP(),
          class_iseq->local_size, 0, class_iseq->stack_max);
+
+    RB_GC_GUARD(class_iseq_val);
+
     RESTORE_REGS();
     NEXT_INSN();
 }

ChangeLog

Tue Jun 16 18:17:31 2015  Koichi Sasada <ko1@atdot.net>

    * insns.def (defineclass): introduce an ad-hoc patch to avoid
      an issue reported on [Bug #10871].

      This patch does not fix completely. For example, method definition
      in a block (like 1.times{def ...; end}) still causes same issue.
      To solve all, we need a huge patch and it seems difficult for
      stable branch.

      Use Ruby 2.3 and later to solve this issue completely.
      (See [Bug #10943])

Updated by nagachika (Tomoyuki Chikanaga) over 4 years ago

Hi, ko1 san.

I applied the ko1's patch on ruby_2_2 branch and make test-rubyspec fails with Segmentation fault.

/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/fixtures/classes.rb:265: [BUG] Segmentation fault at 0x00000000000000
ruby 2.2.3p137 (2015-06-18 revision 50923) [x86_64-darwin14]

-- 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
   for more details.

-- Control frame information -----------------------------------------------
c:0031 p:0009 s:0105 e:000104 LAMBDA /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/fixtures/classes.rb:265 [FINISH]
c:0030 p:0009 s:0103 e:000102 BLOCK  /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/block_given_spec.rb:15 [FINISH]
c:0029 p:---- s:0101 e:000100 CFUNC  :instance_eval
c:0028 p:0013 s:0098 e:000097 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:69
c:0027 p:0017 s:0092 e:000091 BLOCK  /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:179 [FINISH]
c:0026 p:---- s:0089 e:000088 IFUNC
c:0025 p:---- s:0087 e:000086 CFUNC  :each
c:0024 p:---- s:0085 e:000084 CFUNC  :all?
c:0023 p:0041 s:0082 e:000081 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:179
c:0022 p:0073 s:0076 e:000075 BLOCK  /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:215
c:0021 p:0006 s:0072 e:000071 BLOCK  /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:239 [FINISH]
c:0020 p:---- s:0070 e:000069 CFUNC  :times
c:0019 p:0014 s:0067 e:000066 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:238
c:0018 p:0013 s:0064 e:000063 BLOCK  /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:207 [FINISH]
c:0017 p:---- s:0061 e:000060 CFUNC  :each
c:0016 p:0091 s:0058 e:000057 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:206
c:0015 p:0075 s:0055 e:000054 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:38
c:0014 p:0025 s:0048 e:000047 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/object.rb:11
c:0013 p:0063 s:0041 E:001e50 TOP    /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/block_given_spec.rb:31 [FINISH]
c:0012 p:---- s:0039 e:000038 CFUNC  :load
c:0011 p:0015 s:0035 e:000034 BLOCK  /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:57 [FINISH]
c:0010 p:---- s:0033 e:000032 CFUNC  :instance_eval
c:0009 p:0013 s:0030 e:000029 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:69
c:0008 p:0061 s:0024 E:000c98 BLOCK  /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:57 [FINISH]
c:0007 p:---- s:0021 e:000020 CFUNC  :each
c:0006 p:0039 s:0018 E:001c08 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:51
c:0005 p:0015 s:0014 e:000013 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:43
c:0004 p:0047 s:0011 e:000010 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/commands/mspec-run.rb:92
c:0003 p:0069 s:0008 e:000007 METHOD /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/utils/script.rb:217
c:0002 p:0047 s:0004 E:001da0 EVAL   /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/bin/mspec-run:8 [FINISH]
c:0001 p:0000 s:0002 E:001f60 TOP    [FINISH]

-- Ruby level backtrace information ----------------------------------------
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/bin/mspec-run:8:in `<main>'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/utils/script.rb:217:in `main'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/commands/mspec-run.rb:92:in `run'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:43:in `process'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:51:in `files'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:51:in `each'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:57:in `block in files'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:69:in `protect'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:69:in `instance_eval'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:57:in `block (2 levels) in files'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:57:in `load'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/block_given_spec.rb:31:in `<top (required)>'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/object.rb:11:in `describe'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:38:in `describe'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:206:in `process'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:206:in `each'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:207:in `block in process'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:238:in `repeat'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:238:in `times'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:239:in `block in repeat'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:215:in `block (2 levels) in process'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:179:in `protect'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:179:in `all?'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:179:in `each'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb:179:in `block in protect'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:69:in `protect'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb:69:in `instance_eval'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/block_given_spec.rb:15:in `block (2 levels) in <top (required)>'
/Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/fixtures/classes.rb:265:in `block in singleton class'

-- Machine register context ------------------------------------------------
 rax: 0x0000000000000000 rbx: 0x0000000000000dbb rcx: 0x0000000000000001
 rdx: 0x0000000000000000 rdi: 0x0000000000000000 rsi: 0x0000000000000dbb
 rbp: 0x00007fff516eccd0 rsp: 0x00007fff516ecc70  r8: 0x0000000000000000
  r9: 0x000000010e850338 r10: 0x000000010e94f6a0 r11: 0x00007fee70c09410
 r12: 0x0000000000000000 r13: 0x0000000000000dbb r14: 0x0000000000000000
 r15: 0x0000000000000000 rip: 0x000000010e67361b rfl: 0x0000000000010246

-- C level backtrace information -------------------------------------------
0   ruby                                0x000000010e6af815 rb_vm_bugreport + 149
1   ruby                                0x000000010e550e69 rb_bug_context + 473
2   ruby                                0x000000010e629933 sigsegv + 83
3   libsystem_platform.dylib            0x00007fff8678df1a _sigtramp + 26
4   ruby                                0x000000010e67361b rb_const_get_0 + 235
5   ???                                 0x0000000000000007 0x0 + 7

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

* Loaded script: /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/bin/mspec-run

* Loaded features:

    0 enumerator.so
    1 rational.so
    2 complex.so
    3 /Users/nagachika/opt/ruby-2.2/src/build/.ext/x86_64-darwin14/enc/encdb.bundle
    4 /Users/nagachika/opt/ruby-2.2/src/build/.ext/x86_64-darwin14/enc/trans/transdb.bundle
    5 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/unicode_normalize.rb
    6 /Users/nagachika/opt/ruby-2.2/src/build/rbconfig.rb
    7 thread.rb
    8 /Users/nagachika/opt/ruby-2.2/src/build/.ext/x86_64-darwin14/thread.bundle
    9 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/compatibility.rb
   10 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/defaults.rb
   11 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/deprecate.rb
   12 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/errors.rb
   13 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/version.rb
   14 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/requirement.rb
   15 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/platform.rb
   16 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/basic_specification.rb
   17 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/stub_specification.rb
   18 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/util/stringio.rb
   19 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/specification.rb
   20 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/exceptions.rb
   21 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/core_ext/kernel_gem.rb
   22 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/monitor.rb
   23 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems/core_ext/kernel_require.rb
   24 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/rubygems.rb
   25 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/utils/version.rb
   26 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/version.rb
   27 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/utils/options.rb
   28 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/context.rb
   29 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/exception.rb
   30 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/tag.rb
   31 /Users/nagachika/opt/ruby-2.2/src/build/.ext/x86_64-darwin14/etc.bundle
   32 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/lib/fileutils.rb
   33 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/mspec.rb
   34 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/actions/tally.rb
   35 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/guards/guard.rb
   36 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/expectations/expectations.rb
   37 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/actions/timer.rb
   38 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/runner/formatters/dotted.rb
   39 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/utils/script.rb
   40 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/commands/mspec-run.rb
   41 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/base.rb
   42 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_an_instance_of.rb
   43 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_ancestor_of.rb
   44 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_close.rb
   45 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_computed_by.rb
   46 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_computed_by_function.rb
   47 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_empty.rb
   48 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_false.rb
   49 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_kind_of.rb
   50 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_nan.rb
   51 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_nil.rb
   52 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_true.rb
   53 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/be_valid_dns_name.rb
   54 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/guards/feature.rb
   55 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/helpers/io.rb
   56 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/complain.rb
   57 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/eql.rb
   58 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/mspec/lib/mspec/matchers/equal.rb
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  429 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/fixtures/thread_runner.rb
  430 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/io/shared/write.rb
  431 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/fixtures/classes.rb
  432 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/shared/complex/Complex.rb
  433 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/fixtures/rational.rb
  434 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/shared/rational/Rational.rb
  435 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/shared/__method__.rb
  436 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/core/kernel/fixtures/__method__.rb
  437 /Users/nagachika/opt/ruby-2.2/src/ruby_2_2/spec/rubyspec/shared/process/abort.rb

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
Don't forget to include the above Crash Report log file.
For details: http://www.ruby-lang.org/bugreport.html

crash dump file

Process:               ruby [12296]
Path:                  /Users/USER/*/ruby
Identifier:            ruby
Version:               0
Code Type:             X86-64 (Native)
Parent Process:        make [12294]
Responsible:           Terminal [345]
User ID:               501

Date/Time:             2015-06-18 05:59:53.087 +0900
OS Version:            Mac OS X 10.10.3 (14D136)
Report Version:        11
Anonymous UUID:        483AEFD5-A87F-0CAA-1FEA-AD4EC10E3D3C

Sleep/Wake UUID:       6903D86A-16DE-44B8-A743-EA3534242F4C

Time Awake Since Boot: 230000 seconds
Time Since Wake:       3100 seconds

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGABRT)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000

VM Regions Near 0:
--> 
    __TEXT                 000000010e50f000-000000010e73d000 [ 2232K] r-x/rwx SM=COW  /Users/USER/*

Application Specific Information:
abort() called

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib          0x00007fff867a8286 __pthread_kill + 10
1   libsystem_c.dylib               0x00007fff88d09b53 abort + 129
2   ruby                            0x000000010e550c89 die + 9
3   ruby                            0x000000010e550ebe rb_bug_context + 558
4   ruby                            0x000000010e629933 sigsegv + 83
5   libsystem_platform.dylib        0x00007fff8678df1a _sigtramp + 26
6   ???                             000000000000000000 0 + 0
7   ruby                            0x000000010e6abb68 vm_get_ev_const + 824
8   ruby                            0x000000010e68d46f vm_exec_core + 1839
9   ruby                            0x000000010e6a07a1 vm_exec + 129
10  ruby                            0x000000010e6a5b0d invoke_block_from_c + 2461
11  ruby                            0x000000010e69f873 vm_invoke_proc + 195
12  ruby                            0x000000010e6ade28 vm_call_bmethod + 184
13  ruby                            0x000000010e6ac8f7 vm_call_method + 1143
14  ruby                            0x000000010e6901e0 vm_exec_core + 13472
15  ruby                            0x000000010e6a07a1 vm_exec + 129
16  ruby                            0x000000010e6a5b0d invoke_block_from_c + 2461
17  ruby                            0x000000010e69def9 yield_under + 393
18  ruby                            0x000000010e6ad735 vm_call_cfunc + 1797
19  ruby                            0x000000010e6901e0 vm_exec_core + 13472
20  ruby                            0x000000010e6a07a1 vm_exec + 129
21  ruby                            0x000000010e6a5b0d invoke_block_from_c + 2461
22  ruby                            0x000000010e69cc27 rb_yield_values2 + 103
23  ruby                            0x000000010e54b9c3 all_iter_i + 19
24  ruby                            0x000000010e6a57fe invoke_block_from_c + 1678
25  ruby                            0x000000010e69c9c0 rb_yield + 192
26  ruby                            0x000000010e5133e9 rb_ary_each + 89
27  ruby                            0x000000010e6a9bd3 vm_call0_body + 2435
28  ruby                            0x000000010e69d12c iterate_method + 220
29  ruby                            0x000000010e69cf69 rb_iterate + 441
30  ruby                            0x000000010e69d03d rb_block_call + 45
31  ruby                            0x000000010e54790d enum_all + 77
32  ruby                            0x000000010e6ad735 vm_call_cfunc + 1797
33  ruby                            0x000000010e6901e0 vm_exec_core + 13472
34  ruby                            0x000000010e6a07a1 vm_exec + 129
35  ruby                            0x000000010e6a5b0d invoke_block_from_c + 2461
36  ruby                            0x000000010e69c9c0 rb_yield + 192
37  ruby                            0x000000010e5b1578 int_dotimes + 56
38  ruby                            0x000000010e6ad735 vm_call_cfunc + 1797
39  ruby                            0x000000010e6901e0 vm_exec_core + 13472
40  ruby                            0x000000010e6a07a1 vm_exec + 129
41  ruby                            0x000000010e6a5b0d invoke_block_from_c + 2461
42  ruby                            0x000000010e69c9c0 rb_yield + 192
43  ruby                            0x000000010e5133e9 rb_ary_each + 89
44  ruby                            0x000000010e6ad735 vm_call_cfunc + 1797
45  ruby                            0x000000010e6901e0 vm_exec_core + 13472
46  ruby                            0x000000010e6a07a1 vm_exec + 129
47  ruby                            0x000000010e6a06ed rb_iseq_eval + 285
48  ruby                            0x000000010e55effb rb_load_internal0 + 315
49  ruby                            0x000000010e55ecaa rb_f_load + 186
50  ruby                            0x000000010e6ad735 vm_call_cfunc + 1797
51  ruby                            0x000000010e690400 vm_exec_core + 14016
52  ruby                            0x000000010e6a07a1 vm_exec + 129
53  ruby                            0x000000010e6a5b0d invoke_block_from_c + 2461
54  ruby                            0x000000010e69def9 yield_under + 393
55  ruby                            0x000000010e6ad735 vm_call_cfunc + 1797
56  ruby                            0x000000010e6ac7ff vm_call_method + 895
57  ruby                            0x000000010e6901e0 vm_exec_core + 13472
58  ruby                            0x000000010e6a07a1 vm_exec + 129
59  ruby                            0x000000010e6a5b0d invoke_block_from_c + 2461
60  ruby                            0x000000010e69c9c0 rb_yield + 192
61  ruby                            0x000000010e5133e9 rb_ary_each + 89
62  ruby                            0x000000010e6ad735 vm_call_cfunc + 1797
63  ruby                            0x000000010e6ac7ff vm_call_method + 895
64  ruby                            0x000000010e6901e0 vm_exec_core + 13472
65  ruby                            0x000000010e6a07a1 vm_exec + 129
66  ruby                            0x000000010e6a1378 rb_iseq_eval_main + 504
67  ruby                            0x000000010e559c34 ruby_exec_internal + 148
68  ruby                            0x000000010e559b5e ruby_run_node + 78
69  ruby                            0x000000010e51086f main + 79
70  libdyld.dylib                   0x00007fff8b6f45c9 start + 1

Thread 1:: ruby-timer-thr
0   libsystem_kernel.dylib          0x00007fff867a95c2 poll + 10
1   libsystem_pthread.dylib         0x00007fff8b746268 _pthread_body + 131
2   libsystem_pthread.dylib         0x00007fff8b7461e5 _pthread_start + 176
3   libsystem_pthread.dylib         0x00007fff8b74441d thread_start + 13

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000006  rcx: 0x00007fee710ecdf8  rdx: 0x0000000000000000
  rdi: 0x000000000000091f  rsi: 0x0000000000000006  rbp: 0x00007fee710ece20  rsp: 0x00007fee710ecdf8
   r8: 0x00007fee710ecdd0   r9: 0x00007fff73a2f300  r10: 0x0000000008000000  r11: 0x0000000000000206
  r12: 0x00007fee710ecf50  r13: 0x000000000000005e  r14: 0x00007fff73a2f300  r15: 0x000000010e6d24c6
  rip: 0x00007fff867a8286  rfl: 0x0000000000000206  cr2: 0x00007fff735f9fd8

Logical CPU:     0
Error Code:      0x02000148
Trap Number:     133


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    0x7fff8ab5d000 -     0x7fff8ab85fff  libxpc.dylib (559.20.9) <D35D0DB2-D7BD-3BE4-8378-062BFE545E1D> /usr/lib/system/libxpc.dylib
    0x7fff8b0fe000 -     0x7fff8b102fff  libcache.dylib (69) <45E9A2E7-99C4-36B2-BEE3-0C4E11614AD1> /usr/lib/system/libcache.dylib
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External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 3
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 11645119
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=88.5M resident=95.8M(108%) swapped_out_or_unallocated=16777216.0T(19884320751616%)
Writable regions: Total=281.2M written=31.7M(11%) resident=162.4M(58%) swapped_out=0K(0%) unallocated=118.7M(42%)

REGION TYPE                      VIRTUAL
===========                      =======
Kernel Alloc Once                     4K
MALLOC                            216.6M
MALLOC (admin)                       16K
STACK GUARD                           4K
Stack                              64.0M
VM_ALLOCATE                          12K
__DATA                             1476K
__LINKEDIT                         71.9M
__TEXT                             16.6M
__UNICODE                           552K
shared memory                         4K
===========                      =======
TOTAL                             371.1M

Updated by ko1 (Koichi Sasada) over 4 years ago

Thank you.

I updated a patch.

Index: insns.def
===================================================================
--- insns.def   (revision 50914)
+++ insns.def   (working copy)
@@ -914,6 +914,8 @@
 (VALUE val)
 {
     VALUE klass;
+    VALUE class_iseq_val = class_iseq->self;
+    rb_iseq_t *orig_class_iseq = NULL;
     rb_vm_defineclass_type_t type = VM_DEFINECLASS_TYPE(flags);

     switch (type) {
@@ -963,7 +965,18 @@
       case VM_DEFINECLASS_TYPE_SINGLETON_CLASS:
    /* val is dummy.  classdef returns class scope value */
    /* super is dummy */
-   klass = rb_singleton_class(cbase);
+   {
+       klass = rb_singleton_class(cbase);
+
+       /* Copy iseq to duplicate cref_stack place.
+        * This is ad-hoc solution for [Bug #10871].
+        * and this does not solve more complicated source code with singleton class.
+        * If you need to solve everything, use Ruby 2.3 and later.
+        */
+       orig_class_iseq = class_iseq;
+       class_iseq_val = rb_iseq_clone(class_iseq->self, cbase);
+       GetISeqPtr(class_iseq_val, class_iseq);
+   }
    break;
       case VM_DEFINECLASS_TYPE_MODULE:
    /* val is dummy.  classdef returns class scope value */
@@ -992,6 +1005,9 @@
     }

     COPY_CREF(class_iseq->cref_stack, vm_cref_push(th, klass, NOEX_PUBLIC, NULL));
+    if (orig_class_iseq) {
+   COPY_CREF(orig_class_iseq->cref_stack, vm_cref_push(th, klass, NOEX_PUBLIC, NULL));
+    }

     /* enter scope */
     vm_push_frame(th, class_iseq, VM_FRAME_MAGIC_CLASS,
@@ -998,6 +1014,9 @@
          klass, 0, VM_ENVVAL_BLOCK_PTR(GET_BLOCK_PTR()),
          class_iseq->iseq_encoded, GET_SP(),
          class_iseq->local_size, 0, class_iseq->stack_max);
+
+    RB_GC_GUARD(class_iseq_val);
+
     RESTORE_REGS();
     NEXT_INSN();
 }

Updated by nagachika (Tomoyuki Chikanaga) over 4 years ago

ko1 san, thank you for updated patch. I confirmed that make check && make test-rubyspec passed with it.
But, I don't have confidence about the importance of this workaround. It might introduces another regression. I want to deliberate upon this patch with caution. I'll apply it after the next patch release and call for users to validation on ruby_2_2 HEAD.

Updated by nagachika (Tomoyuki Chikanaga) over 4 years ago

Hi,

I pushed a branch containing ko1's patch onto https://github.com/nagachika/ruby/tree/ruby_2_2_singleton_class_threadsafe.
Please test your applications & libraries with it.

Regards,

#14

Updated by nagachika (Tomoyuki Chikanaga) about 4 years ago

  • Status changed from Open to Closed

Applied in changeset backport22:r51673.


  • insns.def (defineclass): introduce an ad-hoc patch to avoid an issue reported on [Bug #10871].

This patch does not fix completely. For example, method definition
in a block (like 1.times{def ...; end}) still causes same issue.
To solve all, we need a huge patch and it seems difficult for
stable branch.

Use Ruby 2.3 and later to solve this issue completely.
(See [Bug #10943])

#15

Updated by nagachika (Tomoyuki Chikanaga) about 4 years ago

  • Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN to 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: DONE

Hello,

I've applied ko1's workaround patch for this issue to ruby_2_2 branch at r51673.
I'm worried about the wrong side effects of this patch.
Please test on ruby_2_2 branch HEAD.
If you use rbenv/ruby-build, you can install ruby_2_2 HEAD via

rbenv install 2.2.0-dev

Regards,

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