#matched after #scan_integer causes segfault #130
Description
I've reproduced the following issue on Ruby 3.4.1, strscan version is the most recent - 3.1.2, macOS:
require 'strscan'
s = StringScanner.new("42abc")
s.scan_integer
s.matchedOutput
Crash Report log information
$ ruby test.rb
test.rb:4: [BUG] Segmentation fault at 0x0000000000000000
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-darwin23]
-- 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:0003 p:---- s:0011 e:000010 CFUNC :matched
c:0002 p:0023 s:0007 E:001308 EVAL test.rb:4 [FINISH]
c:0001 p:0000 s:0003 E:001290 DUMMY [FINISH]
-- Ruby level backtrace information ----------------------------------------
test.rb:4:in '<main>'
test.rb:4:in 'matched'
-- Threading information ---------------------------------------------------
Total ractor count: 1
Ruby thread count for this ractor: 1
-- Machine register context ------------------------------------------------
rax: 0x0000000000000000 rbx: 0x0000600003974000 rcx: 0x0000000109034038
rdx: 0x0000000109034038 rdi: 0x000000010912d3b0 rsi: 0x0000000109034038
rbp: 0x00007ff7b6f5b9a0 rsp: 0x00007ff7b6f5b990 r8: 0x00007fd0c231b040
r9: 0x00007fd0c231b038 r10: 0x33f9482520000031 r11: 0x00006000018702a0
r12: 0x000000010912d130 r13: 0x0000600001475ad0 r14: 0x000000010912d130
r15: 0x00007fd0c241af90 rip: 0x0000000109032539 rfl: 0x0000000000010202
-- C level backtrace information -------------------------------------------
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_vm_bugreport+0x9bd) [0x109eb95fd]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x148) [0x109cd45d8]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(sigsegv+0x4c) [0x109e0f27c]
/usr/lib/system/libsystem_platform.dylib(_sigtramp+0x1d) [0x7ff811683fdd]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/strscan-3.1.2/lib/strscan.bundle(strscan_matched+0x29) [0x109032539]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0x134) [0x109eaa804]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(vm_exec_core+0x2f58) [0x109e8c408]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_vm_exec+0x1ac) [0x109e8801c]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(rb_ec_exec_node+0x9c) [0x109cdfd0c]
/Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib(ruby_run_node+0x43) [0x109cdfc23]
/Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby(main+0x65) [0x108fa3f55]
-- 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 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/encdb.bundle
7 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/trans/transdb.bundle
8 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/rbconfig.rb
9 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/compatibility.rb
10 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/defaults.rb
11 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/deprecate.rb
12 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/errors.rb
13 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/target_rbconfig.rb
14 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/unknown_command_spell_checker.rb
15 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/exceptions.rb
16 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/basic_specification.rb
17 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/stub_specification.rb
18 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/platform.rb
19 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/specification_record.rb
20 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/util/list.rb
21 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/version.rb
22 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/requirement.rb
23 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/specification.rb
24 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/util.rb
25 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/dependency.rb
26 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/core_ext/kernel_gem.rb
27 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/monitor.bundle
28 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/monitor.rb
29 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems.rb
30 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/bundled_gems.rb
31 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/rubygems/path_support.rb
32 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/error_highlight/version.rb
33 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/error_highlight/base.rb
34 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/error_highlight/formatter.rb
35 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/error_highlight/core_ext.rb
36 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/error_highlight.rb
37 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/version.rb
38 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/core_ext/name_error.rb
39 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/levenshtein.rb
40 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/jaro_winkler.rb
41 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checker.rb
42 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
43 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
44 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/name_error_checkers.rb
45 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/method_name_checker.rb
46 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/key_error_checker.rb
47 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/null_checker.rb
48 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/tree_spell_checker.rb
49 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/require_path_checker.rb
50 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/spell_checkers/pattern_key_name_checker.rb
51 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean/formatter.rb
52 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/did_you_mean.rb
53 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/syntax_suggest/core_ext.rb
54 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/strscan-3.1.2/lib/strscan/strscan.rb
55 /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/strscan-3.1.2/lib/strscan.bundle
* Process memory map:
108fa3000-108fa4000 r-x /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fa4000-108fa5000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fa5000-108fa6000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fa6000-108fa8000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
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108fad000-108fb1000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fb1000-108fb2000 --- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fb2000-108fbd000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fbd000-108fbe000 --- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fbe000-108fbf000 --- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fbf000-108fca000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fca000-108fcb000 --- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fcb000-108fcc000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fcc000-108fcd000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fcd000-108fd4000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fd4000-108fd5000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fd5000-108fd8000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/bin/ruby
108fda000-108fdc000 r-x /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/encdb.bundle
108fdc000-108fdd000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/encdb.bundle
108fdd000-108fde000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/encdb.bundle
108fde000-108fdf000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/encdb.bundle
108fe0000-108ff0000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/trans/transdb.bundle
108ff0000-108ff2000 r-x /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/trans/transdb.bundle
108ff2000-108ff3000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/trans/transdb.bundle
108ff3000-108ff4000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/enc/trans/transdb.bundle
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108ff5000-108ff6000 r-x /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/monitor.bundle
108ff6000-108ff7000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/monitor.bundle
108ff7000-108ff8000 rw- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/monitor.bundle
108ff8000-108ff9000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/ruby/3.4.0/x86_64-darwin23/monitor.bundle
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109541000-109c0d000 r-- /Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
109c0d000-10a13b000 r-x /Users/andrykonchin/.rbenv/versions/3.4.1/lib/libruby.3.4.dylib
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7ff853800000-7ff853a00000 rw-
7ff853a00000-7ff854800000 r--
7ff854800000-7ff854a00000 rw-
7ff854a00000-7ff854c00000 rw-
7ff854c00000-7ff854d65000 rw-
7ff854d65000-7ff880000000 r--
7ff880000000-7ffffe000000 r--
7fffffe00000-7fffffe01000 r--
7ffffff96000-7ffffff97000 r-x
[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.
[1] 71982 segmentation fault ruby test.rb