[ruby-core:119993] [Ruby master Bug#20906] Segmentation Fault in compile_keyword_arg

22 Nov 2024

      Issue #20906 has been updated by eightbitraptor (Matt V-H).

Worth noting that this is reported as a syntax error in Ruby 3.4.0 using both `prism` and `parse.y`

```
ruby 3.4.0dev (2024-09-27T10:34:35Z master 7f83bd3732) +PRISM [arm64-darwin24]
```

```
❯ ruby --parser=parse.y -e "a,b[c:nil]=d"
-e:1: keyword arg given in index assignment
a,b[c:nil]=d
ruby: compile error (SyntaxError)
```
```
❯ ruby --parser=prism -e "a,b[c:nil]=d"
-e: -e:1: syntax error found (SyntaxError)
...
1 | a,b[c:nil]=d
    |     ^~~~~ unexpected keyword arg given in index assignment; keywords are not allowed in index assignment expressions
  2 |

----------------------------------------
Bug #20906: Segmentation Fault in compile_keyword_arg
https://bugs.ruby-lang.org/issues/20906#change-110734

* Author: bendrissou (Bachir Bendrissou)
* Status: Open
* ruby -v: 3.3.5
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Hi,

I am getting a segmentation fault. The crash occurs in `compile_keyword_arg` (../compile.c:4604) during argument compilation for the keyword argument assignment. 

Minimised test case:

a,b[c:nil]=d
```

Output:
```
test.rb: [BUG] Segmentation fault at 0x0000000000000000
ruby 3.3.5 (2024-09-03 revision ef084cc8f4) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0001 p:0000 s:0003 E:002270 DUMMY  [FINISH]

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

-- Machine register context ------------------------------------------------
 RIP: 0x0000555fdcc6bb95 RBP: 0x0000000000000001 RSP: 0x00007ffe63864fc0
 RAX: 0x0000555fddc4fc80 RBX: 0x0000555fddc4fc88 RCX: 0x0000000000000001
 RDX: 0x0000000000000000 RDI: 0x0000555fddb7c2a0 RSI: 0x0000000000000018
  R8: 0x0000555fddb7c2a8  R9: 0x00007fbba21b6b80 R10: 0x0000000000000000
 R11: 0x0000000000000007 R12: 0x00007ffe638650a0 R13: 0x00007fbb86d032b8
 R14: 0x0000000000000000 R15: 0x0000555fddc52470 EFL: 0x0000000000010206

-- C level backtrace information -------------------------------------------
/home/benchmarks/ruby/program/build/ruby(rb_print_backtrace+0x11) [0x555fdcb0da7f] ../vm_dump.c:820
/home/benchmarks/ruby/program/build/ruby(rb_vm_bugreport) ../vm_dump.c:1151
/home/benchmarks/ruby/program/build/ruby(rb_bug_for_fatal_signal+0xfc) [0x555fdccd9a6c] ../error.c:1065
/home/benchmarks/ruby/program/build/ruby(sigsegv+0x4d) [0x555fdca5c1fd] ../signal.c:926
/lib/x86_64-linux-gnu/libpthread.so.0(__restore_rt+0x0) [0x7fbba21ed420]
/home/benchmarks/ruby/program/build/ruby(compile_keyword_arg+0x55) [0x555fdcc6bb95] ../compile.c:4604
/home/benchmarks/ruby/program/build/ruby(setup_args_core) ../compile.c:6063
/home/benchmarks/ruby/program/build/ruby(setup_args) ../compile.c:6181
/home/benchmarks/ruby/program/build/ruby(compile_attrasgn+0x90) [0x555fdcc6f440] ../compile.c:9696
/home/benchmarks/ruby/program/build/ruby(iseq_compile_each0+0x2082) [0x555fdcc63b82] ../compile.c:10433
/home/benchmarks/ruby/program/build/ruby(iseq_compile_each+0x11) [0x555fdcc70d91] ../compile.c:9767
/home/benchmarks/ruby/program/build/ruby(compile_massign_lhs) ../compile.c:5281
/home/benchmarks/ruby/program/build/ruby(compile_massign0+0xd4) [0x555fdcc712b4] ../compile.c:5475
/home/benchmarks/ruby/program/build/ruby(compile_massign+0xf5) [0x555fdcc77425] ../compile.c:5536
/home/benchmarks/ruby/program/build/ruby(iseq_compile_each0+0xeea) [0x555fdcc629ea] ../compile.c:9871
/home/benchmarks/ruby/program/build/ruby(iseq_compile_each+0x29) [0x555fdcc66ae9] ../compile.c:9767
/home/benchmarks/ruby/program/build/ruby(rb_iseq_compile_node+0x658) [0x555fdcc71c48] ../compile.c:931
/home/benchmarks/ruby/program/build/ruby(rb_iseq_new_with_opt+0x15d) [0x555fdc97189d] ../iseq.c:946
/home/benchmarks/ruby/program/build/ruby(rb_iseq_new_main+0x6f) [0x555fdc971c4f] ../iseq.c:885
/home/benchmarks/ruby/program/build/ruby(process_options+0x103f) [0x555fdca5767f] ../ruby.c:2444
/home/benchmarks/ruby/program/build/ruby(ruby_process_options+0x14c) [0x555fdca5876c] ../ruby.c:3017
/home/benchmarks/ruby/program/build/ruby(ruby_options+0xdd) [0x555fdc9047bd] ../eval.c:121
/home/benchmarks/ruby/program/build/ruby(rb_main+0x19) [0x555fdc8ff42f] ../main.c:39
/home/benchmarks/ruby/program/build/ruby(main) ../main.c:58
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7fbba1fee083]
[0x555fdc8ff48e]

-- 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 /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/encdb.so
    7 /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/trans/transdb.so
    8 /home/benchmarks/ruby/program/build/rbconfig.rb
    9 /home/benchmarks/ruby/program/lib/rubygems/compatibility.rb
   10 /home/benchmarks/ruby/program/lib/rubygems/defaults.rb
   11 /home/benchmarks/ruby/program/lib/rubygems/deprecate.rb
   12 /home/benchmarks/ruby/program/lib/rubygems/errors.rb
   13 /home/benchmarks/ruby/program/lib/rubygems/unknown_command_spell_checker.rb
   14 /home/benchmarks/ruby/program/lib/rubygems/exceptions.rb
   15 /home/benchmarks/ruby/program/lib/rubygems/basic_specification.rb
   16 /home/benchmarks/ruby/program/lib/rubygems/stub_specification.rb
   17 /home/benchmarks/ruby/program/lib/rubygems/platform.rb
   18 /home/benchmarks/ruby/program/lib/rubygems/specification_record.rb
   19 /home/benchmarks/ruby/program/lib/rubygems/util/list.rb
   20 /home/benchmarks/ruby/program/lib/rubygems/version.rb
   21 /home/benchmarks/ruby/program/lib/rubygems/requirement.rb
   22 /home/benchmarks/ruby/program/lib/rubygems/specification.rb
   23 /home/benchmarks/ruby/program/lib/rubygems/util.rb
   24 /home/benchmarks/ruby/program/lib/rubygems/core_ext/kernel_gem.rb
   25 /home/benchmarks/ruby/program/build/.ext/x86_64-linux/monitor.so
   26 /home/benchmarks/ruby/program/ext/monitor/lib/monitor.rb
   27 /home/benchmarks/ruby/program/lib/rubygems.rb
   28 /home/benchmarks/ruby/program/lib/bundled_gems.rb
   29 /home/benchmarks/ruby/program/lib/error_highlight/version.rb
   30 /home/benchmarks/ruby/program/lib/error_highlight/base.rb
   31 /home/benchmarks/ruby/program/lib/error_highlight/formatter.rb
   32 /home/benchmarks/ruby/program/lib/error_highlight/core_ext.rb
   33 /home/benchmarks/ruby/program/lib/error_highlight.rb
   34 /home/benchmarks/ruby/program/lib/did_you_mean/version.rb
   35 /home/benchmarks/ruby/program/lib/did_you_mean/core_ext/name_error.rb
   36 /home/benchmarks/ruby/program/lib/did_you_mean/levenshtein.rb
   37 /home/benchmarks/ruby/program/lib/did_you_mean/jaro_winkler.rb
   38 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checker.rb
   39 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
   40 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
   41 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/name_error_checkers.rb
   42 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/method_name_checker.rb
   43 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/key_error_checker.rb
   44 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/null_checker.rb
   45 /home/benchmarks/ruby/program/lib/did_you_mean/tree_spell_checker.rb
   46 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/require_path_checker.rb
   47 /home/benchmarks/ruby/program/lib/did_you_mean/spell_checkers/pattern_key_name_checker.rb
   48 /home/benchmarks/ruby/program/lib/did_you_mean/formatter.rb
   49 /home/benchmarks/ruby/program/lib/did_you_mean.rb
   50 /home/benchmarks/ruby/program/lib/syntax_suggest/core_ext.rb

* Process memory map:

555fdc8ad000-555fdc8f0000 r--p 00000000 00:8d 5569471                    /home/benchmarks/ruby/program/build/ruby
555fdc8f0000-555fdcd02000 r-xp 00043000 00:8d 5569471                    /home/benchmarks/ruby/program/build/ruby
555fdcd02000-555fdce92000 r--p 00455000 00:8d 5569471                    /home/benchmarks/ruby/program/build/ruby
555fdce92000-555fdcea9000 r--p 005e4000 00:8d 5569471                    /home/benchmarks/ruby/program/build/ruby
555fdcea9000-555fdceaa000 rw-p 005fb000 00:8d 5569471                    /home/benchmarks/ruby/program/build/ruby
555fdceaa000-555fdcebf000 rw-p 00000000 00:00 0 
555fddb79000-555fddf8b000 rw-p 00000000 00:00 0                          [heap]
7fbb82fa8000-7fbb83198000 r--s 00000000 00:8d 1277502                    /usr/lib/x86_64-linux-gnu/libc-2.31.so
7fbb83198000-7fbb86b20000 r--s 00000000 00:8d 5569471                    /home/benchmarks/ruby/program/build/ruby
7fbb86b20000-7fbb86b30000 rw-p 00000000 00:00 0 
7fbb86c40000-7fbb86c50000 rw-p 00000000 00:00 0 
7fbb86cb9000-7fbb86ce0000 r--s 00000000 00:8d 1277596                    /usr/lib/x86_64-linux-gnu/libpthread-2.31.so
7fbb86ce0000-7fbb86cf0000 rw-p 00000000 00:00 0 
7fbb86d00000-7fbb86da0000 rw-p 00000000 00:00 0 
7fbb86daf000-7fbb86db0000 ---p 00000000 00:00 0 
7fbb86db0000-7fbb86e51000 rw-p 00000000 00:00 0 
7fbb86e51000-7fbb86e52000 ---p 00000000 00:00 0 
7fbb86e52000-7fbb86ef3000 rw-p 00000000 00:00 0 
7fbb86ef3000-7fbb86ef4000 ---p 00000000 00:00 0 
7fbb86ef4000-7fbb86f95000 rw-p 00000000 00:00 0 
7fbb86f95000-7fbb86f96000 ---p 00000000 00:00 0 
7fbb86f96000-7fbb87037000 rw-p 00000000 00:00 0 
7fbb87037000-7fbb87038000 ---p 00000000 00:00 0 
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7fbb872c0000-7fbb87361000 rw-p 00000000 00:00 0 
7fbb87361000-7fbb87362000 ---p 00000000 00:00 0 
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7fbb881f0000-7fbb88a40000 rw-p 00000000 00:00 0 
7fbb88a4a000-7fbb88a4b000 r--p 00000000 00:8d 5569421                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/monitor.so
7fbb88a4b000-7fbb88a4c000 r-xp 00001000 00:8d 5569421                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/monitor.so
7fbb88a4c000-7fbb88a4d000 r--p 00002000 00:8d 5569421                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/monitor.so
7fbb88a4d000-7fbb88a4e000 r--p 00002000 00:8d 5569421                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/monitor.so
7fbb88a4e000-7fbb88a4f000 rw-p 00003000 00:8d 5569421                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/monitor.so
7fbb88a4f000-7fbba1ec0000 rw-p 00000000 00:00 0 
7fbba1ec1000-7fbba1ec2000 r--p 00000000 00:8d 5569519                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/trans/transdb.so
7fbba1ec2000-7fbba1ec4000 r-xp 00001000 00:8d 5569519                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/trans/transdb.so
7fbba1ec4000-7fbba1ec5000 r--p 00003000 00:8d 5569519                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/trans/transdb.so
7fbba1ec5000-7fbba1ec6000 r--p 00003000 00:8d 5569519                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/trans/transdb.so
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7fbba1fca000-7fbba1fec000 r--p 00000000 00:8d 1277502                    /usr/lib/x86_64-linux-gnu/libc-2.31.so
7fbba1fec000-7fbba2164000 r-xp 00022000 00:8d 1277502                    /usr/lib/x86_64-linux-gnu/libc-2.31.so
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7fbba21b8000-7fbba21bc000 rw-p 00000000 00:00 0 
7fbba21bc000-7fbba21bf000 r--p 00000000 00:8d 1277527                    /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
7fbba21bf000-7fbba21d1000 r-xp 00003000 00:8d 1277527                    /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
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7fbba234d000-7fbba2362000 r-xp 00002000 00:8d 1277509                    /usr/lib/x86_64-linux-gnu/libcrypt.so.1.1.0
7fbba2362000-7fbba237c000 r--p 00017000 00:8d 1277509                    /usr/lib/x86_64-linux-gnu/libcrypt.so.1.1.0
7fbba237c000-7fbba237d000 r--p 00030000 00:8d 1277509                    /usr/lib/x86_64-linux-gnu/libcrypt.so.1.1.0
7fbba237d000-7fbba237e000 rw-p 00031000 00:8d 1277509                    /usr/lib/x86_64-linux-gnu/libcrypt.so.1.1.0
7fbba237e000-7fbba2386000 rw-p 00000000 00:00 0 
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7fbba2387000-7fbba2389000 r-xp 00001000 00:8d 1277513                    /usr/lib/x86_64-linux-gnu/libdl-2.31.so
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7fbba238a000-7fbba238b000 r--p 00003000 00:8d 1277513                    /usr/lib/x86_64-linux-gnu/libdl-2.31.so
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7fbba238c000-7fbba2396000 r--p 00000000 00:8d 1277531                    /usr/lib/x86_64-linux-gnu/libgmp.so.10.4.0
7fbba2396000-7fbba23f6000 r-xp 0000a000 00:8d 1277531                    /usr/lib/x86_64-linux-gnu/libgmp.so.10.4.0
7fbba23f6000-7fbba240d000 r--p 0006a000 00:8d 1277531                    /usr/lib/x86_64-linux-gnu/libgmp.so.10.4.0
7fbba240d000-7fbba240e000 ---p 00081000 00:8d 1277531                    /usr/lib/x86_64-linux-gnu/libgmp.so.10.4.0
7fbba240e000-7fbba240f000 r--p 00081000 00:8d 1277531                    /usr/lib/x86_64-linux-gnu/libgmp.so.10.4.0
7fbba240f000-7fbba2410000 rw-p 00082000 00:8d 1277531                    /usr/lib/x86_64-linux-gnu/libgmp.so.10.4.0
7fbba2410000-7fbba2412000 r--p 00000000 00:8d 1277632                    /usr/lib/x86_64-linux-gnu/libz.so.1.2.11
7fbba2412000-7fbba2423000 r-xp 00002000 00:8d 1277632                    /usr/lib/x86_64-linux-gnu/libz.so.1.2.11
7fbba2423000-7fbba2429000 r--p 00013000 00:8d 1277632                    /usr/lib/x86_64-linux-gnu/libz.so.1.2.11
7fbba2429000-7fbba242a000 ---p 00019000 00:8d 1277632                    /usr/lib/x86_64-linux-gnu/libz.so.1.2.11
7fbba242a000-7fbba242b000 r--p 00019000 00:8d 1277632                    /usr/lib/x86_64-linux-gnu/libz.so.1.2.11
7fbba242b000-7fbba242c000 rw-p 0001a000 00:8d 1277632                    /usr/lib/x86_64-linux-gnu/libz.so.1.2.11
7fbba242c000-7fbba242e000 rw-p 00000000 00:00 0 
7fbba2432000-7fbba2433000 r--p 00000000 00:8d 5569472                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/encdb.so
7fbba2433000-7fbba2434000 r-xp 00001000 00:8d 5569472                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/encdb.so
7fbba2434000-7fbba2435000 r--p 00002000 00:8d 5569472                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/encdb.so
7fbba2435000-7fbba2436000 r--p 00002000 00:8d 5569472                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/encdb.so
7fbba2436000-7fbba2437000 rw-p 00003000 00:8d 5569472                    /home/benchmarks/ruby/program/build/.ext/x86_64-linux/enc/encdb.so
7fbba2437000-7fbba2438000 r--p 00000000 00:8d 1277480                    /usr/lib/x86_64-linux-gnu/ld-2.31.so
7fbba2438000-7fbba245b000 r-xp 00001000 00:8d 1277480                    /usr/lib/x86_64-linux-gnu/ld-2.31.so
7fbba245b000-7fbba2463000 r--p 00024000 00:8d 1277480                    /usr/lib/x86_64-linux-gnu/ld-2.31.so
7fbba2464000-7fbba2465000 r--p 0002c000 00:8d 1277480                    /usr/lib/x86_64-linux-gnu/ld-2.31.so
7fbba2465000-7fbba2466000 rw-p 0002d000 00:8d 1277480                    /usr/lib/x86_64-linux-gnu/ld-2.31.so
7fbba2466000-7fbba2467000 rw-p 00000000 00:00 0 
7ffe6306a000-7ffe63869000 rw-p 00000000 00:00 0                          [stack]
7ffe6393d000-7ffe63940000 r--p 00000000 00:00 0                          [vvar]
7ffe63940000-7ffe63941000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]

```

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