Issue #19595 has been reported by jhawthorn (John Hawthorn). ---------------------------------------- Bug #19595: YJIT: Crash from missing argc check in known cfuncs https://bugs.ruby-lang.org/issues/19595 * Author: jhawthorn (John Hawthorn) * Status: Open * Priority: Normal * Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED ---------------------------------------- https://github.com/ruby/ruby/pull/7697 Previously we were missing a compile-time check that the known cfuncs receive the correct number of arguments. ``` $ ruby --yjit-call-threshold=1 -e '"foo".to_s(*[])' ruby: YJIT has panicked. More info to follow... thread '<unnamed>' panicked at 'assertion failed: `(left == right)` left: `1`, right: `2`', ./yjit/src/codegen.rs:7225:5 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace -e:1: [BUG] YJIT panicked ruby 3.3.0dev (2023-04-08T18:54:01Z master 671cfc2000) +YJIT [x86_64-linux] ``` This likely needs a backport to Ruby 3.2, Ruby 3.1 does not have this bug -- https://bugs.ruby-lang.org/