Ruby Issue Tracking System

Today

05:58 AM Ruby Revision e5518bee (git): gc: take the VM barrier inside rb_objspace_each_objects

Walking the heap needs a stable set of pages: a concurrent GC on another
Ractor is stop-the-world and would otherwise pause the walk mid-iteration
and free or move objects out from under the callback. Callers that mutate
what they visit ... ko1 (Koichi Sasada)

05:54 AM Ruby Revision db3a1939 (git): iseq: use RB_OBJ_WRITE for the lazy-load loader object

iseq->aux.loader.obj holds the ibf loader while an iseq is
ISEQ_NOT_LOADED_YET, and iseq_mark marks it, so the store into it is a
GC-managed reference and should go through the write barrier rather than a
raw assignment.
Co-Authored-By:... ko1 (Koichi Sasada)

12:03 AM Ruby Revision e7001117 (git): Postponed jobs targeted at a specific Ractor

rb_postponed_job_trigger_for_ractor(h, running_ractor) runs a
preregistered postponed job on running_ractor rather than on the
caller's or the main Ractor: the handle's bit is set in a per-Ractor
atomic mask and a POSTPONED_JOB interrupt... ko1 (Koichi Sasada)

07/03/2026

04:25 PM Ruby Revision 9233cc3b (git): test: a new Ractor does not inherit the creating thread's fiber storage

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> ko1 (Koichi Sasada)

03:51 PM Ruby Revision 6f13d755 (git): vm_trace: read postponed-job table entries atomically

rb_postponed_job_preregister already stores table[i].func/data with atomic
CAS/EXCHANGE, but rb_postponed_job_flush read them non-atomically, which
races when a job is (pre)registered on another thread while a job fires.
Load them atomic... ko1 (Koichi Sasada)

02:50 PM Ruby Revision 3c3a805c (git): mark internal cross-Ractor structures as shareable

The concurrent set, managed id-table dups and symbol id-entry buckets are
reachable from every Ractor via VM-global state (the frozen-string/symbol
tables, shape-tree edge tables, the symbol table), so flag them shareable --
as enc_list_... ko1 (Koichi Sasada)

02:50 PM Ruby Revision c4bda536 (git): depend: add ruby/ractor.h for concurrent_set.o

concurrent_set.c now includes ruby/ractor.h for RB_OBJ_SET_SHAREABLE.
(id_table.c is #included into symbol.c, which already depends on ruby/ractor.h,
so no separate entry is needed.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply... ko1 (Koichi Sasada)

04:08 AM Ruby Revision 45633fa7 (git): object.c: initialize clone freeze-kwarg caches atomically

rb_get_freeze_opt and rb_obj_clone_setup lazily initialized shared static
caches (the freeze keyword id and the `{freeze: true/false}` hashes) with a
plain `if (!cache)` guard. When Ractors run #clone concurrently this races:
a thread ca... ko1 (Koichi Sasada)

03:24 AM Ruby Revision 10e53afd (git): ractor: lock the owner when Port#closed? is queried from another Ractor

ractor_closed_port_p asserts the owning ractor's lock is held for foreign
access and reads sync.ports via st_lookup, but Ractor::Port#closed?
(ractor_port_closed_p) called it without the lock. From a foreign Ractor this
tripped the asser... ko1 (Koichi Sasada)

01:57 AM Ruby Revision ff96f9dc (git): thread: build a new Ractor's interrupt queue on its own main thread

Defer creating a Ractor main thread's pending-interrupt queue and mask stack
from thread_create_core (the creating thread) to thread_start_func_2 (the new
Ractor's own main thread). The mask stack starts empty rather than duplicating
the... ko1 (Koichi Sasada)