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Bug #16695
closed
Stack consistency error when using the return value
Status:
Closed
Priority:
Normal
Assignee:
-
Target version:
-
ruby -v:
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin18]
Backport:
Description
Some versions of ruby occur Stack consistency error by following the reproduction code.
Reproduction code¶
x = false; y = (return until x unless x)
Per versions¶
- 2.3.8
unexpected return (LocalJumpError)
- 2.4.9
- no problem
- 2.5.7, 2.6.5, 2.7.0
Stack consistency error
Backtrace (2.7.0p0)¶
-e:1: [BUG] Stack consistency error (sp: 7, bp: 8)
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin18]
-- Crash Report log information --------------------------------------------
See Crash Report log file under the one of following:
* ~/Library/Logs/DiagnosticReports
* /Library/Logs/DiagnosticReports
for more details.
Don't forget to include the above Crash Report log file in bug reports.
-- Control frame information -----------------------------------------------
c:0002 p:0020 s:0007 E:0004c0 EVAL -e:1 [FINISH]
c:0001 p:0000 s:0003 E:002260 (none) [FINISH]
-- Ruby level backtrace information ----------------------------------------
-e:1:in `<main>'
-- C level backtrace information -------------------------------------------
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(rb_vm_bugreport+0x96) [0x1058bc6d6]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(rb_bug+0xd4) [0x1058c7fae]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(vm_stack_consistency_error.cold.1+0x2a) [0x1058ca09a]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(vm_stack_consistency_error+0x12) [0x1058b4cd2]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(vm_exec_core+0x43cf) [0x105897a3f]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(rb_vm_exec+0xa49) [0x1058aa529]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(rb_ec_exec_node+0xb6) [0x105715d06]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib(ruby_run_node+0x55) [0x105715c05]
/Users/takamasa-saichi/.rbenv/versions/2.7.0/bin/ruby(main+0x5d) [0x105673f0d]
-- Other runtime information -----------------------------------------------
* Loaded script: -e
* Loaded features:
0 enumerator.so
1 thread.rb
2 rational.so
3 complex.so
4 ruby2_keywords.rb
5 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/encdb.bundle
6 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
7 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/rbconfig.rb
8 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/compatibility.rb
9 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/defaults.rb
10 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/deprecate.rb
11 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/errors.rb
12 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/version.rb
13 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/requirement.rb
14 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/platform.rb
15 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/basic_specification.rb
16 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/stub_specification.rb
17 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/util.rb
18 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/text.rb
19 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/user_interaction.rb
20 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/specification_policy.rb
21 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/util/list.rb
22 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/specification.rb
23 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/exceptions.rb
24 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/bundler_version_finder.rb
25 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/dependency.rb
26 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_gem.rb
27 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/monitor.bundle
28 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/monitor.rb
29 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb
30 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_warn.rb
31 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems.rb
32 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/rubygems/path_support.rb
33 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/version.rb
34 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/core_ext/name_error.rb
35 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/levenshtein.rb
36 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/jaro_winkler.rb
37 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checker.rb
38 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
39 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
40 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/name_error_checkers.rb
41 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/method_name_checker.rb
42 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/key_error_checker.rb
43 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/null_checker.rb
44 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/formatters/plain_formatter.rb
45 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean/tree_spell_checker.rb
46 /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/did_you_mean.rb
* Process memory map:
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108d2a000-108d2b000 --- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108d2b000-108dcc000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108dcc000-108dcd000 --- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108dcd000-108e6e000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108e6e000-108e6f000 --- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108e6f000-108f10000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108f10000-108f11000 --- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108f11000-108fb2000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108fb2000-108fb3000 --- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
108fb3000-109054000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
109054000-10906c000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
10906c000-10906e000 r-x /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
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10906f000-109070000 r-- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
109070000-10907f000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/bin/ruby
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1090b4000-1090ed000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/bin/ruby
1090ed000-1090f0000 r-- /Users/takamasa-saichi/.rbenv/versions/2.7.0/bin/ruby
1090f0000-1094d2000 r-- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib
11382c000-113897000 r-x /usr/lib/dyld
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11389c000-1138d0000 rw- /usr/lib/dyld
1138d0000-1138f7000 r-- /usr/lib/dyld
7000025f1000-7000025f2000 --- /usr/lib/dyld
7000025f2000-700002674000 rw- /usr/lib/dyld
7fce95400000-7fce95500000 rw- /usr/lib/dyld
7fce95500000-7fce95600000 rw- /usr/lib/dyld
7fce95600000-7fce95700000 rw- /usr/lib/dyld
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7fce95800000-7fce96000000 rw- /usr/lib/dyld
7fce96000000-7fce96800000 rw- /usr/lib/dyld
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7fce96900000-7fce96a00000 rw- /usr/lib/dyld
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7fce96b00000-7fce96c00000 rw- /usr/lib/dyld
7fce96c00000-7fce96d00000 rw- /usr/lib/dyld
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7fce98800000-7fce99000000 rw- /usr/lib/dyld
7fce99000000-7fce99800000 rw- /usr/lib/dyld
7ffee658d000-7ffee9d8d000 --- /usr/lib/dyld
7ffee9d8d000-7ffeea58d000 rw- /usr/lib/dyld
7fff00000000-7fff80000000 r-- /usr/lib/dyld
7fff80000000-7fff95f59000 r-- /usr/lib/dyld
7fff95f59000-7fff96000000 rw- /usr/lib/dyld
7fff96000000-7fff9c000000 r-- /usr/lib/dyld
7fff9c000000-7fff9c200000 rw- /usr/lib/dyld
7fff9c200000-7fff9c800000 r-- /usr/lib/dyld
7fff9c800000-7fff9ca00000 rw- /usr/lib/dyld
7fff9ca00000-7fff9cc00000 rw- /usr/lib/dyld
7fff9cc00000-7fff9ce00000 rw- /usr/lib/dyld
7fff9ce00000-7fff9d000000 rw- /usr/lib/dyld
7fff9d000000-7fff9d200000 rw- /usr/lib/dyld
7fff9d200000-7fff9d400000 rw- /usr/lib/dyld
7fff9d400000-7fff9e400000 r-- /usr/lib/dyld
7fff9e400000-7fff9e600000 rw- /usr/lib/dyld
7fff9e600000-7fffa0200000 r-- /usr/lib/dyld
7fffa0200000-7fffa0400000 rw- /usr/lib/dyld
7fffa0400000-7fffa1200000 r-- /usr/lib/dyld
7fffa1200000-7fffa1400000 rw- /usr/lib/dyld
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7fffa3800000-7fffa3a00000 rw- /usr/lib/dyld
7fffa3a00000-7fffa3c00000 rw- /usr/lib/dyld
7fffa3c00000-7fffa3e00000 rw- /usr/lib/dyld
7fffa3e00000-7fffa4000000 rw- /usr/lib/dyld
7fffa4000000-7fffa402e000 rw- /usr/lib/dyld
7fffa402e000-7fffc0000000 r-- /usr/lib/dyld
7fffc0000000-7fffffe00000 r-- /usr/lib/dyld
7fffffe00000-7fffffe01000 r-- /usr/lib/dyld
7ffffff03000-7ffffff04000 r-x /usr/lib/dyld
[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.
Files
Related issues
Updated by nobu (Nobuyoshi Nakada) about 1 year ago
- Backport changed from 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN to 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED
Thank you for the interesting report.
I confirmed that this has existed since 1.9.1 at least, by wrapping in a method.
$ ruby1.9 -e 'def f;x = false; y = (return until x unless x);end;f' -e:1: [BUG] Stack consistency error (sp: 10, bp: 11) ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-darwin19.0.0]
Updated by jeremyevans0 (Jeremy Evans) 11 months ago
This is due to a bug in the optimizer. Adding return COMPILE_OK; to the top of iseq_peephole_optimize fixes the problem.
Instructions before (optimization/broken):
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,52)> (catch: FALSE) 0000 definemethod :f, f ( 1)[Li] 0003 putself 0004 opt_send_without_block <calldata!mid:f, argc:0, FCALL|VCALL|ARGS_SIMPLE> 0006 leave == disasm: #<ISeq:f@-e:1 (1,0)-(1,50)> (catch: FALSE) == catch table | catch type: break st: 0017 ed: 0025 sp: 0001 cont: 0025 | catch type: next st: 0017 ed: 0025 sp: 0001 cont: 0014 | catch type: redo st: 0017 ed: 0025 sp: 0001 cont: 0017 |------------------------------------------------------------------------ local table (size: 2, argc: 0 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1]) [ 2] x@0 [ 1] y@1 0000 putobject false ( 1)[LiCa] 0002 setlocal_WC_0 x@0 0004 getlocal_WC_0 x@0 0006 branchunless 20 0008 putnil 0009 jump 26 0011 jump 20 0013 putnil 0014 pop 0015 jump 20 0017 pop 0018 putnil 0019 leave [Re] 0020 getlocal_WC_0 x@0 0022 branchunless 17 0024 putnil 0025 nop 0026 dup ( 1) 0027 setlocal_WC_0 y@1 0029 leave [Re]
Instructions after (no optimization/working):
== disasm: #<ISeq:<main>@t/t29.rb:1 (1,0)-(5,1)> (catch: FALSE) 0000 definemethod :f, f ( 1)[Li] 0003 putself ( 5)[Li] 0004 opt_send_without_block <calldata!mid:f, argc:0, FCALL|VCALL|ARGS_SIMPLE> 0006 leave == disasm: #<ISeq:f@t/t29.rb:1 (1,0)-(4,3)> (catch: FALSE) == catch table | catch type: break st: 0019 ed: 0028 sp: 0000 cont: 0028 | catch type: next st: 0019 ed: 0028 sp: 0000 cont: 0016 | catch type: redo st: 0019 ed: 0028 sp: 0000 cont: 0019 |------------------------------------------------------------------------ local table (size: 2, argc: 0 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1]) [ 2] x@0 [ 1] y@1 0000 putobject false ( 2)[LiCa] 0002 setlocal_WC_0 x@0 0004 getlocal_WC_0 x@0 ( 3)[Li] 0006 branchunless 13 0008 jump 10 0010 putnil 0011 jump 29 0013 jump 21 0015 putnil 0016 pop 0017 jump 21 0019 putnil 0020 leave [Re] 0021 getlocal_WC_0 x@0 0023 branchunless 19 0025 jump 27 0027 putnil 0028 nop 0029 dup ( 3) 0030 setlocal_WC_0 y@1 0032 leave ( 4)[Re]
One thing that jumps out at me is the optimized version uses pop between jump and putnil (instruction 0017). That could be why sp is lower than bp. However, I don't have that much experience reading iseq instructions, so that's more of a guess than anything.
Updated by jeremyevans0 (Jeremy Evans) 11 months ago
Through trial and error, I've determined this is caused by the branchif/branchnil/branchunless optimization, self described as a super nasty hack. I've submitted a pull request to disable this optimization (https://github.com/ruby/ruby/pull/3150), and think it should be committed until someone can debug the optimization and fix it (assuming it passes CI).
Updated by wanabe (_ wanabe) 8 months ago
How about adjust sp in dead code that is after jump?
diff --git a/compile.c b/compile.c
index dfa3802579..85cbd42893 100644
--- a/compile.c
+++ b/compile.c
@@ -5386,6 +5386,9 @@ compile_if(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int
branches);
end_label = NEW_LABEL(line);
ADD_INSNL(then_seq, line, jump, end_label);
+ if (!popped) {
+ ADD_INSN(then_seq, line, pop);
+ }
}
ADD_SEQ(ret, then_seq);
}
Updated by wanabe (_ wanabe) 8 months ago
Oops, my patch is duplicated at 43c1eb440a7 == r61618 partially so I must revert it at first.
diff --git a/compile.c b/compile.c
index dfa3802579..2766e985c3 100644
--- a/compile.c
+++ b/compile.c
@@ -2836,7 +2836,6 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
goto again;
}
else if (IS_INSN_ID(diobj, leave)) {
- INSN *pop;
/*
* jump LABEL
* ...
@@ -2844,7 +2843,6 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
* leave
* =>
* leave
- * pop
* ...
* LABEL:
* leave
@@ -2854,9 +2852,6 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
iobj->insn_id = BIN(leave);
iobj->operand_size = 0;
iobj->insn_info = diobj->insn_info;
- /* adjust stack depth */
- pop = new_insn_body(iseq, diobj->insn_info.line_no, BIN(pop), 0);
- ELEM_INSERT_NEXT(&iobj->link, &pop->link);
goto again;
}
else if (IS_INSN(iobj->link.prev) &&
@@ -5386,6 +5381,9 @@ compile_if(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int
branches);
end_label = NEW_LABEL(line);
ADD_INSNL(then_seq, line, jump, end_label);
+ if (!popped) {
+ ADD_INSN(then_seq, line, pop);
+ }
}
ADD_SEQ(ret, then_seq);
}
Updated by wanabe (_ wanabe) 8 months ago
- Related to Bug #14273: Stack Consistency Error from return in loop added
Updated by wanabe (_ wanabe) 8 months ago
Maybe there are some potential issues.
$ ruby -v -e 'RubyVM::InstructionSequence.compile("def f; return 1 unless true or any; end", peephole_optimization: false).eval'
ruby 2.8.0dev (2020-08-02T03:05:19Z wanabe/master ac69849e49) [x86_64-linux]
-- raw disasm--------
trace: 8
trace: 1
0000 jump <L000> ( 1)
* 0002 branchunless <L001> ( 1)
0004 jump <L000> ( 1)
<L000> [sp: 0]
0006 putnil ( 1)
0007 jump <L003> ( 1)
<L001> [sp: -1]
0009 putobject_INT2FIX_1_ ( 1)
<L003> [sp: -1]
trace: 10
0010 leave ( 1)
---------------------
<compiled>: <compiled>:1: argument stack underflow (-1) (SyntaxError)
$ ruby -v -e 'def f; return 1 if false and any; nil; end' ruby 2.8.0dev (2020-08-02T03:05:19Z wanabe/master ac69849e49) [x86_64-linux] -- raw disasm-------- trace: 8 trace: 1 0000 jump <L001> ( 1) * 0002 branchunless <L001> ( 1) <L003> [sp: -1] adjust: [label: -1] 0004 putobject_INT2FIX_1_ ( 1) trace: 10 0005 leave ( 1) adjust: [label: 3] <L001> [sp: 0] 0006 putnil ( 1) trace: 10 0007 leave ( 1) --------------------- -e: -e:1: argument stack underflow (-1) (SyntaxError)
I sent Pull Request to fix some issues I found.
https://github.com/ruby/ruby/pull/3402
Updated by wanabe (_ wanabe) 7 months ago
I rewrited the patch https://github.com/ruby/ruby/pull/3445 on 2020-08-22.
I would appreciate it if someone could review this.
Updated by wanabe (_ wanabe) 6 months ago
- Status changed from Open to Closed
Applied in changeset git|ce7a053475cbebfb2f3e5ed6614e0ba631541917.
Adjust sp for x = false; y = (return until x unless x) [Bug #16695]
Updated by nagachika (Tomoyuki Chikanaga) about 2 months ago
- Backport changed from 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED to 2.5: REQUIRED, 2.6: REQUIRED, 2.7: DONE
ruby_2_7 c271c7a225c6175f56f00b785e3034cb4a2b7658 merged revision(s) ce7a053475cbebfb2f3e5ed6614e0ba631541917,1cbb1f1720127b0b34b38c77e27b51b182008699.
Updated by usa (Usaku NAKAMURA) 6 days ago
- Backport changed from 2.5: REQUIRED, 2.6: REQUIRED, 2.7: DONE to 2.5: REQUIRED, 2.6: DONE, 2.7: DONE
backported into ruby_2_6 at r67925
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