June 2025 - ruby-core - ml.ruby-lang.org

[ruby-core:122054] [Ruby Bug#21333] heap-use-after-free caused by rehash during update
by cyruscyliu (Qiang Liu) 14 Jul '25

14 Jul '25

Issue #21333 has been reported by cyruscyliu (Qiang Liu). ---------------------------------------- Bug #21333: heap-use-after-free caused by rehash during update https://bugs.ruby-lang.org/issues/21333 * Author: cyruscyliu (Qiang Liu) * Status: Open * ruby -v: ruby 3.5.0dev (2025-05-13T08:35:34Z master a6435befa7) +PRISM [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Hi, we found a heap-use-after-free caused by rehash during update ``` $a = (1..1337).to_h { |k| [k, k] } $a.update($b) { |k, o, n| $a.rehash } ``` ``` $ git log | head -n4 commit a6435befa76c2ae0525147f934bd9cd1914ffb8a Author: Jean Boussier <jean.boussier(a)gmail.com> Date: Mon May 12 11:02:17 2025 +0200 $ ./ruby triaged/hash_update.rb `RubyGems' were not loaded. `error_highlight' was not loaded. `did_you_mean' was not loaded. `syntax_suggest' was not loaded. ================================================================= ==227694==ERROR: AddressSanitizer: heap-use-after-free on address 0x52f00000e410 at pc 0x64f4179fa0d5 bp 0x7ffec17cce10 sp 0x7ffec17cce08 WRITE of size 8 at 0x52f00000e410 thread T0 #0 0x64f4179fa0d4 in rb_st_update /media/test/ruby/build/../st.c:1508:23 #1 0x64f417814018 in rb_hash_stlike_update /media/test/ruby/build/../hash.c:1686:12 #2 0x64f417814018 in tbl_update /media/test/ruby/build/../hash.c:1727:15 #3 0x64f417823d09 in rb_hash_update_block_i /media/test/ruby/build/../hash.c:4162:5 #4 0x64f417810576 in hash_ar_foreach_iter /media/test/ruby/build/../hash.c:1302:18 #5 0x64f417810576 in ar_foreach_check /media/test/ruby/build/../hash.c:944:22 #6 0x64f417810576 in hash_foreach_call /media/test/ruby/build/../hash.c:1435:15 #7 0x64f4177a45c6 in rb_ensure /media/test/ruby/build/../eval.c:1074:18 #8 0x64f417810329 in rb_hash_foreach /media/test/ruby/build/../hash.c:1463:9 #9 0x64f41781b88f in rb_hash_update /media/test/ruby/build/../hash.c:4219:13 #10 0x64f417b409db in vm_call_cfunc_with_frame_ /media/test/ruby/build/../vm_insnhelper.c:3798:11 #11 0x64f417b2904a in vm_call_method_each_type /media/test/ruby/build/../vm_insnhelper.c:4776:16 #12 0x64f417b28b13 in vm_call_method /media/test/ruby/build/../vm_insnhelper.c #13 0x64f417af0539 in vm_sendish /media/test/ruby/build/../vm_insnhelper.c:5995:15 #14 0x64f417af0539 in vm_exec_core /media/test/ruby/build/../insns.def:851:11 #15 0x64f417ae5cd7 in rb_vm_exec /media/test/ruby/build/../vm.c #16 0x64f4177a1bf0 in rb_ec_exec_node /media/test/ruby/build/../eval.c:281:9 #17 0x64f4177a1bf0 in ruby_run_node /media/test/ruby/build/../eval.c:319:30 #18 0x64f41779d2b0 in rb_main /media/test/ruby/build/../main.c:42:12 #19 0x64f41779d2b0 in main /media/test/ruby/build/../main.c:62:12 #20 0x72d96ba2a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16 #21 0x72d96ba2a28a in __libc_start_main csu/../csu/libc-start.c:360:3 #22 0x64f4176c3d94 in _start (/media/test/ruby/build/ruby+0x14bd94) (BuildId: 5c3c6444d00499cf0254892dbef6454db4a9698a) 0x52f00000e410 is located 16 bytes inside of 49152-byte region [0x52f00000e400,0x52f00001a400) freed by thread T0 here: #0 0x64f41775e94a in free (/media/test/ruby/build/ruby+0x1e694a) (BuildId: 5c3c6444d00499cf0254892dbef6454db4a9698a) #1 0x64f4177c944b in rb_gc_impl_free /media/test/ruby/build/../gc/default/default.c:8099:9 #2 0x64f4177c944b in ruby_sized_xfree /media/test/ruby/build/../gc.c:5225:13 #3 0x64f4177c944b in ruby_xfree /media/test/ruby/build/../gc.c:5236:5 #4 0x64f417811e09 in hash_st_free /media/test/ruby/build/../hash.c:1218:5 #5 0x64f417811e09 in rb_hash_rehash /media/test/ruby/build/../hash.c:2026:9 #6 0x64f417b409db in vm_call_cfunc_with_frame_ /media/test/ruby/build/../vm_insnhelper.c:3798:11 #7 0x64f417b2904a in vm_call_method_each_type /media/test/ruby/build/../vm_insnhelper.c:4776:16 #8 0x64f417b28b13 in vm_call_method /media/test/ruby/build/../vm_insnhelper.c #9 0x64f417aed6f3 in vm_sendish /media/test/ruby/build/../vm_insnhelper.c:5995:15 #10 0x64f417aed6f3 in vm_exec_core /media/test/ruby/build/../insns.def:899:11 #11 0x64f417ae5cd7 in rb_vm_exec /media/test/ruby/build/../vm.c #12 0x64f417b5bdcc in invoke_iseq_block_from_c /media/test/ruby/build/../vm.c:1653:12 #13 0x64f417b5bdcc in invoke_block_from_c_bh /media/test/ruby/build/../vm.c:1667:20 #14 0x64f417b0e2a7 in vm_yield_with_cref /media/test/ruby/build/../vm.c:1704:12 #15 0x64f417b0e2a7 in vm_yield /media/test/ruby/build/../vm.c:1712:12 #16 0x64f417b0e2a7 in rb_yield_0 /media/test/ruby/build/../vm_eval.c:1361:12 #17 0x64f417b0e2a7 in rb_yield_values /media/test/ruby/build/../vm_eval.c:1400:16 #18 0x64f417823db5 in rb_hash_update_block_callback /media/test/ruby/build/../hash.c:4148:31 #19 0x64f417823d48 in rb_hash_update_block_callback_insert /media/test/ruby/build/../hash.c:4157:1 #20 0x64f4178225c7 in tbl_update_modify /media/test/ruby/build/../hash.c:1696:15 #21 0x64f4179f9bea in rb_st_update /media/test/ruby/build/../st.c:1498:14 #22 0x64f417814018 in rb_hash_stlike_update /media/test/ruby/build/../hash.c:1686:12 #23 0x64f417814018 in tbl_update /media/test/ruby/build/../hash.c:1727:15 #24 0x64f417823d09 in rb_hash_update_block_i /media/test/ruby/build/../hash.c:4162:5 #25 0x64f417810576 in hash_ar_foreach_iter /media/test/ruby/build/../hash.c:1302:18 #26 0x64f417810576 in ar_foreach_check /media/test/ruby/build/../hash.c:944:22 #27 0x64f417810576 in hash_foreach_call /media/test/ruby/build/../hash.c:1435:15 #28 0x64f4177a45c6 in rb_ensure /media/test/ruby/build/../eval.c:1074:18 #29 0x64f417810329 in rb_hash_foreach /media/test/ruby/build/../hash.c:1463:9 #30 0x64f41781b88f in rb_hash_update /media/test/ruby/build/../hash.c:4219:13 #31 0x64f417b409db in vm_call_cfunc_with_frame_ /media/test/ruby/build/../vm_insnhelper.c:3798:11 #32 0x64f417b2904a in vm_call_method_each_type /media/test/ruby/build/../vm_insnhelper.c:4776:16 #33 0x64f417b28b13 in vm_call_method /media/test/ruby/build/../vm_insnhelper.c #34 0x64f417af0539 in vm_sendish /media/test/ruby/build/../vm_insnhelper.c:5995:15 #35 0x64f417af0539 in vm_exec_core /media/test/ruby/build/../insns.def:851:11 #36 0x64f417ae5cd7 in rb_vm_exec /media/test/ruby/build/../vm.c #37 0x64f4177a1bf0 in rb_ec_exec_node /media/test/ruby/build/../eval.c:281:9 #38 0x64f4177a1bf0 in ruby_run_node /media/test/ruby/build/../eval.c:319:30 #39 0x64f41779d2b0 in rb_main /media/test/ruby/build/../main.c:42:12 #40 0x64f41779d2b0 in main /media/test/ruby/build/../main.c:62:12 #41 0x72d96ba2a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16 #42 0x72d96ba2a28a in __libc_start_main csu/../csu/libc-start.c:360:3 #43 0x64f4176c3d94 in _start (/media/test/ruby/build/ruby+0x14bd94) (BuildId: 5c3c6444d00499cf0254892dbef6454db4a9698a) previously allocated by thread T0 here: #0 0x64f41775ebe3 in malloc (/media/test/ruby/build/ruby+0x1e6be3) (BuildId: 5c3c6444d00499cf0254892dbef6454db4a9698a) #1 0x64f417805df5 in rb_gc_impl_malloc /media/test/ruby/build/../gc/default/default.c:8114:5 #2 0x64f4177d49f2 in ruby_xmalloc_body /media/test/ruby/build/../gc.c:5116:12 #3 0x64f4177d49f2 in ruby_xmalloc /media/test/ruby/build/../gc.c:5106:34 #4 0x64f4179f44a1 in rb_st_init_existing_table_with_size /media/test/ruby/build/../st.c:559:39 #5 0x64f4179f65b0 in rb_st_init_table_with_size /media/test/ruby/build/../st.c:585:5 #6 0x64f4179f65b0 in rebuild_table /media/test/ruby/build/../st.c:753:19 #7 0x64f4179f65b0 in rebuild_table_if_necessary /media/test/ruby/build/../st.c:1125:9 #8 0x64f4179f6f6b in st_add_direct_with_hash /media/test/ruby/build/../st.c:1187:5 #9 0x64f4179f9cf3 in rb_st_update /media/test/ruby/build/../st.c:1502:13 #10 0x64f417814018 in rb_hash_stlike_update /media/test/ruby/build/../hash.c:1686:12 #11 0x64f417814018 in tbl_update /media/test/ruby/build/../hash.c:1727:15 #12 0x64f417813e82 in rb_hash_aset /media/test/ruby/build/../hash.c #13 0x64f417814510 in rb_hash_set_pair /media/test/ruby/build/../hash.c:3715:5 #14 0x64f417ae1bf3 in vm_yield_with_cfunc /media/test/ruby/build/../vm_insnhelper.c:5161:11 #15 0x64f417b5b7f9 in invoke_block_from_c_bh /media/test/ruby/build/../vm.c:1672:16 #16 0x64f417b0dcca in vm_yield_with_cref /media/test/ruby/build/../vm.c:1704:12 #17 0x64f417b0dcca in vm_yield /media/test/ruby/build/../vm.c:1712:12 #18 0x64f417b0dcca in rb_yield_0 /media/test/ruby/build/../vm_eval.c:1361:12 #19 0x64f417b0dcca in rb_yield /media/test/ruby/build/../vm_eval.c #20 0x64f4179371c7 in range_each_fixnum_loop /media/test/ruby/build/../range.c:1059:9 #21 0x64f4179371c7 in range_each /media/test/ruby/build/../range.c:1096:16 #22 0x64f417b53fd5 in vm_call0_cfunc_with_frame /media/test/ruby/build/../vm_eval.c:164:15 #23 0x64f417b53fd5 in vm_call0_cfunc /media/test/ruby/build/../vm_eval.c:178:12 #24 0x64f417b53fd5 in vm_call0_body /media/test/ruby/build/../vm_eval.c:229:15 #25 0x64f417b57a0a in vm_call0_cc /media/test/ruby/build/../vm_eval.c:101:12 #26 0x64f417b57a0a in rb_call0 /media/test/ruby/build/../vm_eval.c:571:12 #27 0x64f417b0f5f5 in rb_call /media/test/ruby/build/../vm_eval.c:890:12 #28 0x64f417b0f5f5 in iterate_method /media/test/ruby/build/../vm_eval.c:1545:12 #29 0x64f417b0fbf5 in rb_iterate0 /media/test/ruby/build/../vm_eval.c:1487:18 #30 0x64f417b0f287 in rb_iterate_internal /media/test/ruby/build/../vm_eval.c:1519:12 #31 0x64f417b0f287 in rb_block_call_kw /media/test/ruby/build/../vm_eval.c:1568:12 #32 0x64f417b0f287 in rb_block_call /media/test/ruby/build/../vm_eval.c:1554:12 #33 0x64f417dad5e0 in enum_hashify_into /media/test/ruby/build/../enum.c:743:5 #34 0x64f417dad5e0 in enum_hashify /media/test/ruby/build/../enum.c:750:12 #35 0x64f417dad5e0 in enum_to_h /media/test/ruby/build/../enum.c:791:12 #36 0x64f417b409db in vm_call_cfunc_with_frame_ /media/test/ruby/build/../vm_insnhelper.c:3798:11 #37 0x64f417b2904a in vm_call_method_each_type /media/test/ruby/build/../vm_insnhelper.c:4776:16 #38 0x64f417b28b13 in vm_call_method /media/test/ruby/build/../vm_insnhelper.c #39 0x64f417af0539 in vm_sendish /media/test/ruby/build/../vm_insnhelper.c:5995:15 #40 0x64f417af0539 in vm_exec_core /media/test/ruby/build/../insns.def:851:11 #41 0x64f417ae5cd7 in rb_vm_exec /media/test/ruby/build/../vm.c #42 0x64f4177a1bf0 in rb_ec_exec_node /media/test/ruby/build/../eval.c:281:9 #43 0x64f4177a1bf0 in ruby_run_node /media/test/ruby/build/../eval.c:319:30 #44 0x64f41779d2b0 in rb_main /media/test/ruby/build/../main.c:42:12 #45 0x64f41779d2b0 in main /media/test/ruby/build/../main.c:62:12 #46 0x72d96ba2a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16 #47 0x72d96ba2a28a in __libc_start_main csu/../csu/libc-start.c:360:3 #48 0x64f4176c3d94 in _start (/media/test/ruby/build/ruby+0x14bd94) (BuildId: 5c3c6444d00499cf0254892dbef6454db4a9698a) SUMMARY: AddressSanitizer: heap-use-after-free /media/test/ruby/build/../st.c:1508:23 in rb_st_update Shadow bytes around the buggy address: 0x52f00000e180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x52f00000e200: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x52f00000e280: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x52f00000e300: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x52f00000e380: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa =>0x52f00000e400: fd fd[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd 0x52f00000e480: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x52f00000e500: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x52f00000e580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x52f00000e600: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x52f00000e680: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==227694==ABORTING triaged/hash_update.rb:3: [BUG] ASAN error ruby 3.5.0dev (2025-05-13T08:35:34Z master a6435befa7) +PRISM [x86_64-linux] -- Control frame information ----------------------------------------------- c:0003 p:---- s:0011 e:000010 CFUNC :update c:0002 p:0029 s:0006 e:000005 EVAL triaged/hash_update.rb:3 [FINISH] c:0001 p:0000 s:0003 E:000be0 DUMMY [FINISH] -- Ruby level backtrace information ---------------------------------------- triaged/hash_update.rb:3:in '<main>' triaged/hash_update.rb:3:in 'update' -- Threading information --------------------------------------------------- Total ractor count: 1 Ruby thread count for this ractor: 1 -- C level backtrace information ------------------------------------------- ./ruby(___interceptor_backtrace) [0x64f4177086aa] /media/test/ruby/build/ruby(rb_print_backtrace+0x14) [0x64f417e7bc97] /media/test/ruby/build/../vm_dump.c:843 /media/test/ruby/build/ruby(rb_vm_bugreport) /media/test/ruby/build/../vm_dump.c:1175 /media/test/ruby/build/ruby(rb_bug_without_die_internal+0x23c) [0x64f417dd016c] /media/test/ruby/build/../error.c:1097 /media/test/ruby/build/ruby(rb_bug_without_die+0x127) [0x64f417dcfe87] /media/test/ruby/build/../error.c:1106 ./ruby(0x64f4177832aa) [0x64f4177832aa] ./ruby(0x64f417763a2f) [0x64f417763a2f] ./ruby(0x64f417766ab5) [0x64f417766ab5] ./ruby(__asan_report_store8) [0x64f417767bdf] /media/test/ruby/build/ruby(rb_st_update+0xcd5) [0x64f4179fa0d5] /media/test/ruby/build/../st.c:1508 /media/test/ruby/build/ruby(tbl_update+0x139) [0x64f417814019] /media/test/ruby/build/../hash.c:1686 /media/test/ruby/build/ruby(rb_hash_update_block_i+0x3a) [0x64f417823d0a] /media/test/ruby/build/../hash.c:4162 /media/test/ruby/build/ruby(hash_ar_foreach_iter+0x10) [0x64f417810577] /media/test/ruby/build/../hash.c:1302 /media/test/ruby/build/ruby(ar_foreach_check) /media/test/ruby/build/../hash.c:944 /media/test/ruby/build/ruby(hash_foreach_call) /media/test/ruby/build/../hash.c:1435 /media/test/ruby/build/ruby(rb_ensure+0x257) [0x64f4177a45c7] /media/test/ruby/build/../eval.c:1074 /media/test/ruby/build/ruby(rb_hash_foreach+0x23a) [0x64f41781032a] /media/test/ruby/build/../hash.c:1463 /media/test/ruby/build/ruby(rb_hash_update+0xe0) [0x64f41781b890] /media/test/ruby/build/../hash.c:4219 /media/test/ruby/build/ruby(vm_cfp_consistent_p+0x0) [0x64f417b409dc] ../vm_insnhelper.c:3798 /media/test/ruby/build/ruby(vm_call_cfunc_with_frame_) ../vm_insnhelper.c:3800 /media/test/ruby/build/ruby(vm_call_method_each_type+0x27b) [0x64f417b2904b] ../vm_insnhelper.c:4776 ./ruby(vm_call_method+0x2d4) [0x64f417b28b14] /media/test/ruby/build/ruby(vm_sendish+0x11f) [0x64f417af053a] ../vm_insnhelper.c:5995 /media/test/ruby/build/ruby(vm_exec_core) ../insns.def:851 ./ruby(vm_exec_loop+0x0) [0x64f417ae5cd8] /media/test/ruby/build/ruby(rb_vm_exec) /media/test/ruby/build/../vm.c:2626 /media/test/ruby/build/ruby(rb_ec_exec_node+0x53) [0x64f4177a1bf1] /media/test/ruby/build/../eval.c:281 /media/test/ruby/build/ruby(ruby_run_node) /media/test/ruby/build/../eval.c:319 /media/test/ruby/build/ruby(rb_main+0x29) [0x64f41779d2b1] /media/test/ruby/build/../main.c:42 /media/test/ruby/build/ruby(main) /media/test/ruby/build/../main.c:62 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_call_main+0x7a) [0x72d96ba2a1ca] ../sysdeps/nptl/libc_start_call_main.h:58 /lib/x86_64-linux-gnu/libc.so.6(call_init+0x0) [0x72d96ba2a28b] ../csu/libc-start.c:360 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main_impl) ../csu/libc-start.c:347 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main) (null):0 ./ruby(_start) [0x64f4176c3d95] -- Other runtime information ----------------------------------------------- * Loaded script: triaged/hash_update.rb * Loaded features: 0 enumerator.so 1 thread.rb 2 fiber.so 3 rational.so 4 complex.so 5 ruby2_keywords.rb 6 set.rb ``` -- https://bugs.ruby-lang.org/

6 8

[ruby-core:121437] [Ruby Bug#21197] Prism does not accept newline after defined? keyword
by kddnewton (Kevin Newton) 14 Jul '25

14 Jul '25

Issue #21197 has been reported by kddnewton (Kevin Newton). ---------------------------------------- Bug #21197: Prism does not accept newline after defined? keyword https://bugs.ruby-lang.org/issues/21197 * Author: kddnewton (Kevin Newton) * Status: Open * Assignee: prism * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ``` defined? (1) ``` -- https://bugs.ruby-lang.org/

2 3

[ruby-core:122154] [Ruby Feature#21346] Introduce `String#ensure_suffix`
by matheusrich (Matheus Richard) 14 Jul '25

14 Jul '25

Issue #21346 has been reported by matheusrich (Matheus Richard). ---------------------------------------- Feature #21346: Introduce `String#ensure_suffix` https://bugs.ruby-lang.org/issues/21346 * Author: matheusrich (Matheus Richard) * Status: Open ---------------------------------------- ## Problem Ensuring a string has a specific suffix or prefix is a common operation in many applications. Bundler itself uses it: https://github.com/rubygems/rubygems/blob/d409ec8b5fc647fabe30e37e17cd1ea85… Here are [GitHub search](https://github.com/search) queries that might find this pattern in other places: 1. for Ruby: `/end(?:s)?_with\?$['"].*['"]$ \?/ lang:ruby -is:fork` 1. for Crystal (a language very similar to Ruby): `/ends_with\?$['"].*['"]$ \?/ lang:crystal -is:fork` ## Suggested solution I believe Ruby would benefit from having a first-class method for this purpose. I suggest the `String#ensure_suffix` and `String#ensure_prefix` methods. I think these names are intuitive enough (here are 2 examples of people using `ensure` for this purpose ([1](https://github.com/boltops-tools/ufo/blob/796104fdb89163d09a58fad42add69…, [2](https://github.com/mumuki/mumuki-domain/blob/6194089d82b1a0c8805ecba98e0…)) I've gone ahead and implemented `String#ensure_suffix` in a [pull request](https://github.com/ruby/ruby/pull/13366) but the suggested behavior is this: ```rb "Hell".ensure_suffix("o!") # => "Hello!" "Hello!".ensure_suffix("o!") # => "Hello!" s = "Hello!" s.ensure_suffix("!").equal?(s) # => true # returns same object if already suffixed ``` -- https://bugs.ruby-lang.org/

8 20

[ruby-core:120618] [Ruby master Bug#21029] Prism behavior for `defined? (;x)` differs
by qnighy (Masaki Hara) 14 Jul '25

14 Jul '25

Issue #21029 has been reported by qnighy (Masaki Hara). ---------------------------------------- Bug #21029: Prism behavior for `defined? (;x)` differs https://bugs.ruby-lang.org/issues/21029 * Author: qnighy (Masaki Hara) * Status: Open * ruby -v: ruby 3.5.0dev (2025-01-11T03:21:57Z master 1b3037081e) +PRISM [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Prism has a different behavior for `(;expr)` when used in `defined?` predicate: ```console % ./miniruby --parser=prism -e "p defined? (;x)" nil % ./miniruby --parser=parse.y -e "p defined? (;x)" "expression" ``` Although not a significant difference, aligning either of them with the other would be better. -- https://bugs.ruby-lang.org/

5 11

[ruby-core:111027] [Ruby master Bug#19154] Specify require and autoload guarantees in ractors
by fxn (Xavier Noria) 14 Jul '25

14 Jul '25

Issue #19154 has been reported by fxn (Xavier Noria). ---------------------------------------- Bug #19154: Specify require and autoload guarantees in ractors https://bugs.ruby-lang.org/issues/19154 * Author: fxn (Xavier Noria) * Status: Open * Priority: Normal * ruby -v: ruby 3.2.0preview3 (2022-11-27) [x86_64-darwin22] * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- Given a file `c.rb`: ```ruby class C end ``` the following script: ```ruby r1 = Ractor.new do require './c.rb' end r2 = Ractor.new do require './c.rb' end r1.take r2.take ``` raises: ``` % ruby -v foo.rb ruby 3.2.0preview3 (2022-11-27) [x86_64-darwin22] foo.rb:1: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues. #<Thread:0x000000010fee2928 run> terminated with exception (report_on_exception is true): #<Thread:0x00000001102acfe0 run> terminated with exception (report_on_exception is true): <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:164:in `ensure in require': can not access non-shareable objects in constant Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError) from <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:167:in `require' from foo.rb:6:in `block in <main>' <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:37:in `require'<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:164:in `ensure in require': : can not access non-shareable objects in constant Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError) from <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:167:in `require' can not access non-shareable objects in constant Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError) from foo.rb:2:in `block in <main>' <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:37:in `require': can not access non-shareable objects in constant Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError) from foo.rb:2:in `block in <main>' from foo.rb:6:in `block in <main>' <internal:ractor>:698:in `take': thrown by remote Ractor. (Ractor::RemoteError) from foo.rb:9:in `<main>' <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:164:in `ensure in require': can not access non-shareable objects in constant Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError) from <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:167:in `require' from foo.rb:2:in `block in <main>' <internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:37:in `require': can not access non-shareable objects in constant Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError) from foo.rb:2:in `block in <main>' ``` Would it be possible to have documentation about their interaction? This is important also to understand autoloading within ractors, since constant references may trigger `require` calls. -- https://bugs.ruby-lang.org/

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[ruby-core:122618] [Ruby Feature#21459] Add Set C-API
by jeremyevans0 (Jeremy Evans) 11 Jul '25

11 Jul '25

Issue #21459 has been reported by jeremyevans0 (Jeremy Evans). ---------------------------------------- Feature #21459: Add Set C-API https://bugs.ruby-lang.org/issues/21459 * Author: jeremyevans0 (Jeremy Evans) * Status: Open ---------------------------------------- I would like to add a minimal C-API for Set: ```c void rb_set_foreach(VALUE set, int (*func)(VALUE element, VALUE arg), VALUE arg); VALUE rb_set_new(void); VALUE rb_set_new_capa(unsigned long capa); bool rb_set_lookup(VALUE set, VALUE element); bool rb_set_add(VALUE set, VALUE element); VALUE rb_set_clear(VALUE set); bool rb_set_delete(VALUE set, VALUE element); size_t rb_set_size(VALUE set); ``` I think this should allow extension libraries to start benefiting from core Set without having to resort to method calls (dangerous in an C extension as they could be redefined to return objects of an unexpected type). I've submitted a pull request for this: https://github.com/ruby/ruby/pull/13735 -- https://bugs.ruby-lang.org/

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[ruby-core:122610] [Ruby Feature#21454] "undefined method 'break' for an instance of Binding"
by vo.x (Vit Ondruch) 10 Jul '25

10 Jul '25

Issue #21454 has been reported by vo.x (Vit Ondruch). ---------------------------------------- Feature #21454: "undefined method 'break' for an instance of Binding" https://bugs.ruby-lang.org/issues/21454 * Author: vo.x (Vit Ondruch) * Status: Open ---------------------------------------- Running my code with `rdbg` and using `binding.break`, it is a bit unfortunate that subsequently running the code without `rdbg`, it fails with error such as: ~~~ NoMethodError: undefined method 'break' for an instance of Binding ~~~ Could this method become no-op if the `rdbg` is not loaded? If there was some concern about this, then it could print some helpful warning or what not. -- https://bugs.ruby-lang.org/

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[ruby-core:122613] [Ruby Bug#21456] IO.close does not work in a IO::TimeoutError block.
by dE (dE Techno) 10 Jul '25

10 Jul '25

Issue #21456 has been reported by dE (dE Techno). ---------------------------------------- Bug #21456: IO.close does not work in a IO::TimeoutError block. https://bugs.ruby-lang.org/issues/21456 * Author: dE (dE Techno) * Status: Open * ruby -v: ruby 3.2.8 (2025-03-26 revision 13f495dc2c) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Invoking the close method on an IO object based on popen will forcefully close the process (not sure what signal it sends, it's undocumented), however when you handle a IO::TimeoutError exception (which you can get when you set .timeout), the close method fails to end the process. It's going to block until the process naturally terminates. Sample code (linux based) -- execArg = 'echo testwrite; sleep 10' tofuProcess = IO.popen(execArg, 'r') puts 'executed tofu process.' tofuProcess.timeout=5 begin tofuOut = tofuProcess.read rescue IO::TimeoutError puts 'rescue occured' tofuProcess.close puts 'process closed' end -- https://bugs.ruby-lang.org/

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[ruby-core:122506] [Ruby Feature#21435] Kernel#optional as a conditional #then
by Alexander.Senko (Alexander Senko) 10 Jul '25

10 Jul '25

Issue #21435 has been reported by Alexander.Senko (Alexander Senko). ---------------------------------------- Feature #21435: Kernel#optional as a conditional #then https://bugs.ruby-lang.org/issues/21435 * Author: Alexander.Senko (Alexander Senko) * Status: Open ---------------------------------------- When chaining, I need sometimes to apply some changes conditionally, like this: ```ruby @record = Record.find(record_id) .then { it.respond_to?(:decorate) ? it.decorate : it } ``` It would be great to DRY it a bit: ```ruby @record = Record.find(record_id) .optional { it.decorate if it.respond_to? :decorate } ``` Reference implementation: ```ruby # Yields self to the block and returns the result of the block if it’s # truthy, and self otherwise. def optional tap do result = yield(self) or next break result end end ``` The name is discussible. -- https://bugs.ruby-lang.org/

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[ruby-core:122604] [Ruby Bug#21452] ARGS_SPLAT bytecode regression between 3.3 and 3.4
by tekknolagi (Maxwell Bernstein) 10 Jul '25

10 Jul '25

Issue #21452 has been reported by tekknolagi (Maxwell Bernstein). ---------------------------------------- Bug #21452: ARGS_SPLAT bytecode regression between 3.3 and 3.4 https://bugs.ruby-lang.org/issues/21452 * Author: tekknolagi (Maxwell Bernstein) * Status: Open * ruby -v: ruby 3.4.3 (2025-04-14 revision d0b7e5b6a0) +PRISM [arm64-darwin24] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- On Ruby 3.3, `f(1, 2, *[3, 4])` splats all arguments to the stack and uses `ARGS_SIMPLE`: ``` plum% ruby --version ruby 3.3.2 (2024-05-30 revision e5a195edf6) [arm64-darwin24] plum% ruby --dump=insns -e 'f(1, 2, *[3, 4])' == disasm: #<ISeq:<main>@-e:1 (1,0)-(1,16)> 0000 putself ( 1)[Li] 0001 putobject_INT2FIX_1_ 0002 putobject 2 0004 putobject 3 0006 putobject 4 0008 opt_send_without_block <calldata!mid:f, argc:4, FCALL|ARGS_SIMPLE> 0010 leave plum% ``` On Ruby 3.4, the same expression results in creating a new array and using `ARGS_SPLAT`: ``` plum% ruby --version ruby 3.4.3 (2025-04-14 revision d0b7e5b6a0) +PRISM [arm64-darwin24] plum% ruby --dump=insns -e 'f(1, 2, *[3, 4])' == disasm: #<ISeq:<main>@-e:1 (1,0)-(1,16)> 0000 putself ( 1)[Li] 0001 putobject_INT2FIX_1_ 0002 putobject 2 0004 duparray [3, 4] 0006 opt_send_without_block <calldata!mid:f, argc:3, ARGS_SPLAT|FCALL> 0008 leave plum% ``` I think we should keep the behavior of 3.3. -- https://bugs.ruby-lang.org/

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