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Bug #16695

Stack consistency error when using the return value

Added by s4ichi (takamasa saichi) 5 months ago. Updated 5 days ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
ruby -v:
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin18]
[ruby-core:97538]

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:

105673000-105674000 r-x /Users/takamasa-saichi/.rbenv/versions/2.7.0/bin/ruby
105674000-105675000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/bin/ruby
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105676000-105678000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib
105678000-105679000 r-- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib
105679000-10596b000 r-x /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/libruby.2.7.dylib
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105a73000-105a74000 r-- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/encdb.bundle
105a74000-105a75000 rw- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/encdb.bundle
105a75000-105a76000 --- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/encdb.bundle
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108be6000-108be7000 --- /Users/takamasa-saichi/.rbenv/versions/2.7.0/lib/ruby/2.7.0/x86_64-darwin18/enc/trans/transdb.bundle
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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

ruby_2020-03-18-201902.crash (37.9 KB) ruby_2020-03-18-201902.crash s4ichi (takamasa saichi), 03/18/2020 11:22 AM

Related issues

Related to Ruby master - Bug #14273: Stack Consistency Error from return in loopClosedActions

Updated by nobu (Nobuyoshi Nakada) 5 months 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) 2 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) 2 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) 5 days 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) 5 days 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);
     }

#6

Updated by wanabe (_ wanabe) 5 days ago

  • Related to Bug #14273: Stack Consistency Error from return in loop added

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