Ruby Issue Tracking System

08/03/2026

04:56 PM Ruby Bug #22220: Performance regression when requiring `aws-sdk-ec2` in Ruby 4.0.6

Possibly fixed by https://github.com/ruby/ruby/pull/18181 viralpraxis (Iaroslav Kurbatov)

07/09/2026

10:01 PM Ruby Revision e36708fa (git): [Bug #22181] Fix branch-peephole-optimization label & insn ID collisions

viralpraxis (Iaroslav Kurbatov)

07/05/2026

12:46 PM Ruby Bug #22181 (Closed): SEGV in branch peephole optimization due to label/insn struct aliasing

Applied in changeset commit:git|6aedc31694f020ee37cd0668779351a714115ad0.
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[Bug #22181] Fix branch-peephole-optimization label & insn ID collisions viralpraxis (Iaroslav Kurbatov)

10:39 AM Ruby Bug #22181 (Closed): SEGV in branch peephole optimization due to label/insn struct aliasing

Both `iseq_label_data` and `iseq_insn_data` share the same layout prefix; in some cases `iseq_label_data->label_no` might collide with `iseq_insn_data->insn_id` (e.g. when there are many (monotonically increasing) label IDs allocated and... viralpraxis (Iaroslav Kurbatov)

12:46 PM Ruby Revision 6aedc316 (git): [Bug #22181] Fix branch-peephole-optimization label & insn ID collisions

viralpraxis (Iaroslav Kurbatov)

06/26/2026

09:34 PM Ruby Revision e4c52b41 (git): [Bug #22126] Fix partial DCE with loop back-edges

The old `remove_unreachable_chunk` walked the dead code once and tried
to do two things at the same time -- count label references inside that
chunk and figure out what exactly to delete.
That breaks for loops -- the loop label comes be... viralpraxis (Iaroslav Kurbatov)

06/24/2026

03:41 AM Ruby Bug #22126 (Closed): Stack underflow for partial DCE and loops

Applied in changeset commit:git|1f473ed633a364f8c89b69a76adfb22a4bf21f96.
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[Bug #22126] Fix partial DCE with loop back-edges
The old `remove_unreachable_chunk` walked the dead code once and tried
to do two things at the same ... viralpraxis (Iaroslav Kurbatov)

03:40 AM Ruby Revision 1f473ed6 (git): [Bug #22126] Fix partial DCE with loop back-edges

The old `remove_unreachable_chunk` walked the dead code once and tried
to do two things at the same time -- count label references inside that
chunk and figure out what exactly to delete.
That breaks for loops -- the loop label comes be... viralpraxis (Iaroslav Kurbatov)

06/23/2026

04:06 PM Ruby Bug #22126 (Closed): Stack underflow for partial DCE and loops

``` ruby
ruby --parser prism -e 'if []; else; a => [*, 42, *]; end'
-- raw disasm--------
trace: 1
0000 putnil ( 1)
0001 leave ... viralpraxis (Iaroslav Kurbatov)

11/07/2025

08:32 AM Ruby Misc #21647: DevMeeting-2025-11-13

* [Feature #21637] tracepoint: add support for global variables read/write events (viralpraxis)
* There seems to be no straightforward way to trace gvar reads/writes in runtime
* `Kernel.trace_var` only works when gvar name is know... viralpraxis (Iaroslav Kurbatov)