From: "Eregon (Benoit Daloze) via ruby-core" Date: 2023-01-05T20:11:15+00:00 Subject: [ruby-core:111666] [Ruby master Bug#18518] NoMemoryError + [FATAL] failed to allocate memory for twice 1 << large Issue #18518 has been updated by Eregon (Benoit Daloze). FWIW on JRuby: ``` $ ruby -v jruby 9.4.1.0-SNAPSHOT (3.1.0) 2022-12-19 6416265092 OpenJDK 64-Bit Server VM 17.0.5+8 on 17.0.5+8 +jit [x86_64-linux] $ jruby -e 'p(1 << (2**64))' RangeError: bignum too big to convert into `long' $ jruby -e 'p(1 << (2**40))' 1 # JRuby bug ``` RangeError seems a fair error if the RHS does not fit in a 32-bit signed int, probably better than NoMemoryError. ---------------------------------------- Bug #18518: NoMemoryError + [FATAL] failed to allocate memory for twice 1 << large https://bugs.ruby-lang.org/issues/18518#change-101056 * Author: Eregon (Benoit Daloze) * Status: Open * Priority: Normal * ruby -v: ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux] * Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- Repro: ```ruby exp = 2**40 # also fails with bignum e.g. 2**64 def exc begin yield rescue NoMemoryError => e p :NoMemoryError end end p exp exc { (1 << exp) } exc { (-1 << exp) } exc { (bignum_value << exp) } exc { (-bignum_value << exp) } ``` Output: ``` $ ruby -v mri_oom.rb ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux] mri_oom.rb:7: warning: assigned but unused variable - e 1099511627776 :NoMemoryError [FATAL] failed to allocate memory ``` 3.1.0 seems fine: ``` $ ruby -v mri_oom.rb ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-linux] mri_oom.rb:7: warning: assigned but unused variable - e 1099511627776 :NoMemoryError :NoMemoryError :NoMemoryError :NoMemoryError ``` -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/