New subject: [ruby-core:111630] [Ruby master Bug#19305] TracePoint#parameters segfaults when certain method creation pattern is used

3 Jan 2023

      Issue #19305 has been reported by st0012 (Stan Lo).

----------------------------------------
Bug #19305: TracePoint#parameters segfaults when certain method creation pattern is used
https://bugs.ruby-lang.org/issues/19305

* Author: st0012 (Stan Lo)
* Status: Open
* Priority: Normal
* ruby -v: 3.2.0, 3.1.3
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
### Reproduction Steps

1. Create a `test.rb` with:

```
class Foo
  attr_reader :bar
  alias_method :bar?, :bar
  remove_method :bar
end

f = Foo.new

TracePoint.trace(:a_call) do |tp|
  puts tp.method_id
  puts tp.parameters
end

f.bar?
```

2. Run `ruby test.rb`
3. Ruby would crash (an example crash report is attached below)

### Implication

I learned this pattern from the [bootsnap gem](https://github.com/Shopify/bootsnap). It defines `Bootsnap::LoadPathCache.enabled?` this way, which is used to patch [`Kernel.require`](https://github.com/Shopify/bootsnap/blob/main/lib/bootsnap/load_path_cache/c...).

This means when users use `bootsnap` (likely a Rails app) with `TracePoint#parameters` (e.g. uses the [debug gem's tracer](https://github.com/ruby/debug/blob/master/lib/debug/tracer.rb#L204)), Ruby would crash whenever `require` is called.

### Crash Report

```
<internal:trace_point>:329: [BUG] Segmentation fault at 0x0000000000000010
ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin21.5.0]

-- Crash Report log information --------------------------------------------
   See Crash Report log file in one of the following locations:             
     * ~/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:0004 p:0003 s:0017 e:000016 METHOD <internal:trace_point>:329
c:0003 p:0013 s:0013 e:000011 BLOCK  test.rb:11 [FINISH]
c:0002 p:0026 s:0008 E:000af8 EVAL   test.rb:14 [FINISH]
c:0001 p:0000 s:0003 E:000a70 DUMMY  [FINISH]

-- Ruby level backtrace information ----------------------------------------
test.rb:14:in `<main>'
test.rb:11:in `block in <main>'
<internal:trace_point>:329:in `parameters'

-- Machine register context ------------------------------------------------
  x0: 0x0000000000000000  x1: 0x000000000000eef1  x2: 0x000000016dbc2000
  x3: 0x000000016dbc2050  x4: 0x0000000000000000  x5: 0x0000000000000000
  x6: 0x0000000000000072  x7: 0x0000000000000024 x18: 0x0000000000000000
 x19: 0x000000016dbc25c0 x20: 0x000000016dbc25f0 x21: 0x0000000148107f00
 x22: 0x0000000000eef10c x23: 0x0000000154060b10 x24: 0x0000000148107f40
 x25: 0x0000000102520fa0 x26: 0x000000015406db59 x27: 0x0000000146823798
 x28: 0x0000000152f06bd0  lr: 0x0000000102c3e354  fp: 0x000000016dbc2040
  sp: 0x000000016dbc2030

-- C level backtrace information -------------------------------------------
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_vm_bugreport+0x9a0) [0x102c3be20]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_bug_for_fatal_signal+0x160) [0x102a60f1c]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(sig_do_nothing+0x0) [0x102b9a798]
/usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x1966182a4]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_tracearg_parameters+0x1a0) [0x102c3e354]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_tracearg_parameters+0x1a0) [0x102c3e354]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(vm_exec_core+0x57b8) [0x102c16988]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_vm_exec+0xb2c) [0x102c26d20]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_vm_invoke_proc+0x4b0) [0x102c24a0c]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_proc_call_with_block+0x58) [0x102b388ac]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(tp_call_trace+0xc0) [0x102c3ea04]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(exec_hooks_protected+0x168) [0x102c3da2c]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_exec_event_hooks+0x80) [0x102c3d774]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(vm_call_method_each_type+0xad8) [0x102c2b970]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(vm_sendish+0x4c8) [0x102c32384]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(vm_exec_core+0x24f0) [0x102c136c0]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_vm_exec+0xb2c) [0x102c26d20]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(rb_ec_exec_node+0x12c) [0x102a6c5b0]
/opt/rubies/3.2.0/lib/libruby.3.2.dylib(ruby_run_node+0x60) [0x102a6c41c]
/opt/rubies/3.2.0/bin/ruby(main+0x68) [0x10223ff34]

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

* Loaded script: test.rb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 fiber.so
    3 rational.so
    4 complex.so
    5 ruby2_keywords.rb
    6 /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
    7 /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/trans/transdb.bundle
    8 /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/rbconfig.rb
    9 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/compatibility.rb
   10 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/defaults.rb
   11 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/deprecate.rb
   12 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/errors.rb
   13 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/unknown_command_spell_checker.rb
   14 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/exceptions.rb
   15 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/basic_specification.rb
   16 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/stub_specification.rb
   17 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/platform.rb
   18 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/util/list.rb
   19 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/version.rb
   20 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/requirement.rb
   21 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/specification.rb
   22 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/util.rb
   23 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/dependency.rb
   24 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/core_ext/kernel_gem.rb
   25 /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/monitor.bundle
   26 /opt/rubies/3.2.0/lib/ruby/3.2.0/monitor.rb
   27 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb
   28 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/core_ext/kernel_warn.rb
   29 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems.rb
   30 /opt/rubies/3.2.0/lib/ruby/3.2.0/rubygems/path_support.rb
   31 /opt/rubies/3.2.0/lib/ruby/3.2.0/error_highlight/version.rb
   32 /opt/rubies/3.2.0/lib/ruby/3.2.0/error_highlight/base.rb
   33 /opt/rubies/3.2.0/lib/ruby/3.2.0/error_highlight/formatter.rb
   34 /opt/rubies/3.2.0/lib/ruby/3.2.0/error_highlight/core_ext.rb
   35 /opt/rubies/3.2.0/lib/ruby/3.2.0/error_highlight.rb
   36 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/version.rb
   37 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/core_ext/name_error.rb
   38 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/levenshtein.rb
   39 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/jaro_winkler.rb
   40 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checker.rb
   41 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
   42 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
   43 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/name_error_checkers.rb
   44 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/method_name_checker.rb
   45 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/key_error_checker.rb
   46 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/null_checker.rb
   47 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/tree_spell_checker.rb
   48 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/require_path_checker.rb
   49 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/spell_checkers/pattern_key_name_checker.rb
   50 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean/formatter.rb
   51 /opt/rubies/3.2.0/lib/ruby/3.2.0/did_you_mean.rb
   52 /opt/rubies/3.2.0/lib/ruby/3.2.0/syntax_suggest/core_ext.rb

* Process memory map:

10223c000-102240000 r-x /opt/rubies/3.2.0/bin/ruby
102240000-102244000 r-- /opt/rubies/3.2.0/bin/ruby
102244000-102248000 r-- /opt/rubies/3.2.0/bin/ruby
102248000-102288000 r-- /opt/rubies/3.2.0/bin/ruby
102288000-10228c000 r-- /opt/rubies/3.2.0/bin/ruby
102290000-1022a0000 rw- /opt/rubies/3.2.0/bin/ruby
1022a0000-1022ac000 r-- /opt/rubies/3.2.0/bin/ruby
1022b0000-1022c0000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022c8000-1022d0000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022d0000-1022d4000 r-- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022d4000-1022d8000 r-- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022d8000-1022dc000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022dc000-1022e0000 --- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022e0000-1022e8000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022e8000-1022ec000 --- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022ec000-1022f0000 --- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022f0000-1022f8000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022f8000-1022fc000 --- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
1022fc000-102300000 --- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
102300000-102308000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
102308000-10230c000 --- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
10230c000-102310000 r-- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
102310000-102314000 r-x /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
102314000-102318000 r-- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
102318000-10231c000 r-- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/encdb.bundle
102320000-102330000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/trans/transdb.bundle
102330000-102334000 r-x /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/trans/transdb.bundle
102334000-102338000 r-- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/trans/transdb.bundle
102338000-10233c000 r-- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/enc/trans/transdb.bundle
102340000-102350000 rw- /opt/rubies/3.2.0/lib/ruby/3.2.0/arm64-darwin21.5.0/monitor.bundle
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102eac000-1030d8000 r-- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1030d8000-1040d8000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1040d8000-1040dc000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1040dc000-104180000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
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104184000-104228000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
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104ea4000-104f48000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
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104f4c000-104ff0000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
104ff0000-104ff4000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
104ff4000-105098000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105098000-10509c000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
10509c000-105140000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105140000-105144000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105144000-1051e8000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1051e8000-1051ec000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1051ec000-105290000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105290000-105294000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105294000-105338000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105338000-10533c000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
10533c000-1053e0000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1053e0000-1053e4000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1053e4000-105488000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105488000-10548c000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
10548c000-105530000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105530000-105534000 --- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
105534000-1055d8000 rw- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
1055d8000-105cd8000 r-- /opt/rubies/3.2.0/lib/libruby.3.2.dylib
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16dbc8000-16dc50000 rw-
180000000-1ee000000 r--
1ee000000-1ef794000 r--
1ef794000-1ef7bc000 rw-
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22f5a0000-230000000 r--
230000000-280000000 r--
fc0000000-1000000000 ---
1000000000-7000000000 ---
[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.
```

-- 
https://bugs.ruby-lang.org/

[ruby-core:111610] [Ruby master Bug#19305] TracePoint#parameters segfaults when certain method creation pattern is used

st0012 (Stan Lo)

peterzhu2118 (Peter Zhu)

st0012 (Stan Lo)

naruse (Yui NARUSE)

nagachika (Tomoyuki Chikanaga)

tags

participants (4)