[ruby-core:120896] [Ruby master Bug#21118] Calling defined?(it) segfaults

6 Feb 2025


      Issue #21118 has been reported by radarek (Radosław Bułat).

----------------------------------------
Bug #21118: Calling defined?(it) segfaults
https://bugs.ruby-lang.org/issues/21118

* Author: radarek (Radosław Bułat)
* Status: Open
* ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [arm64-darwin24]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
```
$ ruby -e '[1, 2, 3].each { p defined?(it) }'
-e: [BUG] Unsupported node PM_IT_LOCAL_VARIABLE_READ_NODE
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [arm64-darwin24]

-- 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:0001 p:0000 s:0003 E:0015d0 DUMMY  [FINISH]


-- Threading information ---------------------------------------------------
Total ractor count: 1
Ruby thread count for this ractor: 1

-- C level backtrace information -------------------------------------------
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x1011f22dc]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_bug_without_die_internal+0xfc) [0x101029680]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_bug+0x1c) [0x10133c298]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_defined_expr0.cold.2+0x0) [0x10133c054]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_defined_expr0+0xcd8) [0x100ff95bc]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_defined_expr+0x174) [0x100fe40e0]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_node+0x23fc) [0x100fb6a20]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_setup_args_core+0x490) [0x100ff6c0c]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_setup_args+0x264) [0x100ff66d0]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_call+0x4a8) [0x100ff5db0]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_scope_node+0x321c) [0x100ff2d20]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_iseq_compile_node+0x120) [0x100fb45f4]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_iseq_new_with_opt_try+0x1c) [0x10108bf6c]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_protect+0xbc) [0x101035620]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_iseq_new_with_opt+0x148) [0x10108b3d8]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_call+0x5b4) [0x100ff5ebc]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_compile_scope_node+0x1c70) [0x100ff1774]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_iseq_compile_node+0x84) [0x100fb4558]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_iseq_new_with_opt_try+0x1c) [0x10108bf6c]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_protect+0xbc) [0x101035620]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_iseq_new_with_opt+0x148) [0x10108b3d8]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(pm_iseq_new_main+0xc4) [0x10108b5e0]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(ruby_process_options+0x176c) [0x101147e70]
/Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(ruby_options+0xb0) [0x101034058]
/Users/radarek/.rbenv/versions/3.4.1/bin/ruby(main+0x64) [0x1004c3f20]

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

* Loaded script: -e

* Loaded features:

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    1 thread.rb
    2 fiber.so
    3 rational.so
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   36 /Users/radarek/.rbenv/versions/3.4.1/lib/ruby/3.4.0/error_highlight.rb
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* Process memory map:

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11b35c000-11b360000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b360000-11b404000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b404000-11b408000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b408000-11b4ac000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b4ac000-11b4b0000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b4b0000-11b554000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b554000-11b558000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b558000-11b5fc000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b5fc000-11b600000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b600000-11b6a4000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b6a4000-11b6a8000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b6a8000-11b74c000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b74c000-11b750000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b750000-11b7f4000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b7f4000-11b7f8000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b7f8000-11b89c000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b89c000-11b8a0000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b8a0000-11b944000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b944000-11b948000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b948000-11b9ec000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b9ec000-11b9f0000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11b9f0000-11ba94000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11ba94000-11ba98000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11ba98000-11bb3c000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bb3c000-11bb40000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bb40000-11bbe4000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bbe4000-11bbe8000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bbe8000-11bc8c000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bc8c000-11bc90000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bc90000-11bd34000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bd34000-11bd38000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bd38000-11bddc000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bddc000-11bde0000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bde0000-11be84000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11be84000-11be88000 --- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11be88000-11bf2c000 rw- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
11bf2c000-11c5d0000 r-- /Users/radarek/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
15ae00000-15af00000 rw-
15af00000-15b000000 rw-
15b000000-15b800000 rw-
15b800000-15c000000 rw-
160000000-168000000 rw-
16b940000-16f144000 ---
16f144000-16f940000 rw-
16f940000-16f944000 ---
16f944000-16f9cc000 rw-
180000000-200000000 r--
200000000-200160000 r--
200160000-200180000 rw-
200180000-200184000 r--
200184000-202000000 rw-
202000000-202304000 r--
202304000-20234c000 r--
20234c000-2034b4000 rw-
2034b4000-20ac98000 r--
20ac98000-20c000000 r--
20c000000-28e000000 r--
28e000000-290000000 rw-
290000000-290910000 r--
290910000-291684000 rw-
291684000-295d30000 r--
295d30000-296000000 r--
296000000-300000000 r--
fc0000000-1000000000 ---
1000000000-7000000000 ---
600000000000-600020000000 rw-
[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.

```


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