Ruby Issue Tracking System

03/19/2026

08:12 AM Ruby Bug #21856: Massive performance degradation of `rb_obj_free` for `T_CLASS` since Ruby 4.0

byroot (Jean Boussier) wrote in #note-11:
> > We usually don't backport performance improvements, but I think we should make an exception.
> ...
This bit us so we downgraded back to Ruby 3.4. Thanks everyone for the fix! nonster (Nony Dutton)

01/22/2026

08:15 AM Ruby Bug #21716: YJIT panic: "all PendingBranchRefs should be unique" in net/http response reading (infinite unwind loop)

alanwu (Alan Wu) wrote in #note-5:
> Unfortunately, with the information available, there is not much we can do on our end.
> ...
Sadly, we don't have much more information yet. We have one additional piece of the puzzle just in case i... nonster (Nony Dutton)

12/01/2025

01:55 PM Ruby Bug #21716: YJIT panic: "all PendingBranchRefs should be unique" in net/http response reading (infinite unwind loop)

alanwu (Alan Wu) wrote in #note-2:
> The rust unwinder seems to be working fine, and the infinite loop seems to be from ruby's own DWARF parser and unwinder in addr2line.c. Can you confirm that before the repeated stack trace lines there... nonster (Nony Dutton)