Issues

• misaligned byte index 1 on UTF-16 string (java.lang.IllegalArgumentException)

  compatibility
  truffleruby/truffleruby#4474 · Filter by author eregon opened on Sep 21, 2026
  1

• Fatal error: Pthread.joinNoTransition — pthread_join failure in cleanupExitedOsThreads racing deopt of NFI closure calls (native image)

  truffleruby/truffleruby#4457 · Filter by author ronaldtse opened on Sep 8, 2026

• IO#read raises TypeError (MinNodeGen) when length is a to_int-coercible object, e.g. BinData values

  truffleruby/truffleruby#4456 · Filter by author ronaldtse opened on Sep 8, 2026
  

• autoload does not block concurrent threads until the file body finishes (waiters see a partially-defined class)

  truffleruby/truffleruby#4455 · Filter by author ronaldtse opened on Sep 8, 2026

• cext: 'dead handle' ShouldNotReachHere escapes from Ox.load after sustained Sulong cext load (34.0.1 native)

  truffleruby/truffleruby#4454 · Filter by author ronaldtse opened on Sep 7, 2026

• Module#prepend into an already-included module does not propagate to prior includers (MRI parity; breaks lutaml-model/mml)

  truffleruby/truffleruby#4452 · Filter by author ronaldtse opened on Sep 7, 2026
  1

• [jvm] SIGBUS in NFI upcall stub from libxml2 pthread-TSD destructor at thread exit (deterministic, macOS arm64, same workload as #4436)

  truffleruby/truffleruby#4437 · Filter by author ronaldtse opened on Sep 2, 2026

• [native] VM crash at teardown: NPE in PolyglotLocals via NFI NativeClosure, concurrent Pthread.joinNoTransition in cleanupExitedOsThread (deterministic, macOS arm64)

  truffleruby/truffleruby#4436 · Filter by author ronaldtse opened on Sep 2, 2026

• Segfault with rbtree

  cextspriority
  truffleruby/truffleruby#4427 · Filter by author rkh opened on Aug 29, 2026
  3

• TracePoint does not support fiber_switch (Ruby 2.3+ compatibility)

  compatibility
  truffleruby/truffleruby#4419 · Filter by author rkh opened on Aug 20, 2026
  3

• Implement Digest::BLAKE3

  compatibility
  truffleruby/truffleruby#4417 · Filter by author eregon opened on Aug 15, 2026

• Update to latest Prism and let Prism format errors if possible

  truffleruby/truffleruby#4404 · Filter by author eregon opened on Aug 8, 2026

• Use FastDoubleParser to speedup String#to_f and Float(String)

  performance
  truffleruby/truffleruby#4399 · Filter by author eregon opened on Aug 5, 2026

• Puma MiniSSL corrupts TLS records under concurrency on TruffleRuby (bad record mac / truncated responses)

  cexts
  truffleruby/truffleruby#4371 · Filter by author WilliamGusmanov opened on Jul 10, 2026
  2

• Strange Exception#backtrace seen from different thread

  truffleruby/truffleruby#4308 · Filter by author nevans opened on Jun 8, 2026

• MRI compatibility differences affecting error_highlight-style diagnostics

  truffleruby/truffleruby#4307 · Filter by author ollym opened on Jun 8, 2026

• ErrorHighlight.spot raises uninitialized constant ErrorHighlight::RubyVM on TruffleRuby when Rails renders detailed exceptions

  compatibility
  truffleruby/truffleruby#4303 · Filter by author ollym opened on Jun 7, 2026
  4

  

• Assert assignPositionOnly() and copyNewlineFlag() are never called on a SequenceNode

  cleanup
  truffleruby/truffleruby#4282 · Filter by author eregon opened on May 30, 2026

• Ox SAX attr callbacks intermittently dropped after Minitest singleton-class stub on a class method

  bug
  truffleruby/truffleruby#4236 · Filter by author sferik opened on May 2, 2026
  1

• ArgumentError: circular causes in the toys gem CI

  compatibilitygood first issue
  truffleruby/truffleruby#4174 · Filter by author eregon opened on Mar 7, 2026
  2

• Many specs with similar failures

  compatibility
  truffleruby/truffleruby#4148 · Filter by author eregon opened on Feb 5, 2026
  7

• Support the POSIX locale, the default locale in Docker images

  embeddinginstalling
  truffleruby/truffleruby#4126 · Filter by author eregon opened on Jan 27, 2026

• Serious performance difference vs Ruby 4.0

  performance
  truffleruby/truffleruby#4093 · Filter by author jzakiya opened on Jan 15, 2026

• Transient segfault in msgpack tests

  cexts
  truffleruby/truffleruby#4091 · Filter by author eregon opened on Jan 15, 2026

• Consider Encoding::InvalidByteSequenceError instead of ArgumentError for not-multiple-of-width bytes in UTF-16/32

  compatibility
  truffleruby/truffleruby#4084 · Filter by author eregon opened on Jan 13, 2026