Issue #21212 has been reported by hanazuki (Kasumi Hanazuki). ---------------------------------------- Bug #21212: IO::Buffer can be freed while its slice is locked https://bugs.ruby-lang.org/issues/21212 * Author: hanazuki (Kasumi Hanazuki) * Status: Open * ruby -v: ruby 3.5.0dev (2025-04-01T16:11:01Z master 30e5e7c005) +PRISM [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ```ruby buffer = IO::Buffer.new(100) slice = buffer.slice buffer.locked do buffer.free rescue p $! #=> IO::Buffer::LockedError (expected) end slice.locked do p slice.locked? #=> true (expected) p buffer.locked? #=> false (what should this be?) slice.free rescue p $! #=> IO::Buffer::LockedError (expected) buffer.free # Should we allow this? slice.set_value(:U8, 0, 42) # raises IO::Buffer::InvalidatedError (surprising!) end ``` -- https://bugs.ruby-lang.org/