Ruby Issue Tracking System

12/17/2025

04:34 PM Ruby Bug #21789 (Open): IO#flush doesn't invoke fiber scheduler io_write hook

When calling `IO#flush` or closing an IO with unflushed writes, the flushing is done by calling `rb_io_blocking_region_wait` and eventually doing a `write` system call. When done in a non-blocking fiber with an active fiber scheduler, th... noteflakes (Sharon Rosner)

11/28/2025

08:46 AM Ruby Bug #21717 (Feedback): Cleanup fiber scheduler after fork

When using a fiber scheduler and forking a process, the child process "inherits" the fiber scheduler. An inherited scheduler will carry over state into the child process, and depending on the underlying event loop mechanism (e.g. epoll, ... noteflakes (Sharon Rosner)

11/22/2025

06:16 AM Ruby Feature #21704 (Open): Expose rb_process_status_new to C extensions

A fiber scheduler implementation with a hook for `#process_wait` needs to return a `Process::Status` object, but currently it is not possible for a C extension to directly create an instance of `Process::Status`. The technique currently ... noteflakes (Sharon Rosner)

07/04/2023

04:47 AM Ruby Bug #19753: IO::Buffer#get_string can't handle negative offset

nobu (Nobuyoshi Nakada) wrote in #note-3:
> > irb(main):003:0> b.get_string(-1000)
> ...
Well now that I look at `String#[]` and `Array#[]` they return `nil` when `offset < -size`:
```ruby
irb(main):001:0> s = 'abc'
=> "abc"
irb(... noteflakes (Sharon Rosner)

07/03/2023

07:35 AM Ruby Bug #19753: IO::Buffer#get_string can't handle negative offset

PR here: https://github.com/ruby/ruby/pull/8015 noteflakes (Sharon Rosner)

06:14 AM Ruby Bug #19753 (Closed): IO::Buffer#get_string can't handle negative offset

```ruby
irb(main):001:0> b = IO::Buffer.for('abc')
=>
#<IO::Buffer 0x00007f858f5450c0+3 EXTERNAL READONLY SLICE>
...
irb(main):002:0> b.get_string(-1)
=> "\x00abc"
irb(main):003:0> b.get_string(-1000, 3)
(irb):3:in `get_string':... noteflakes (Sharon Rosner)