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Prevent ifunc procs from being made shareable #15503

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Merged
byroot merged 1 commit into from
Dec 12, 2025
+16 −1
Merged

Prevent ifunc procs from being made shareable #15503

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12 changes: 12 additions & 0 deletions test/ruby/test_ractor.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -201,6 +201,18 @@ def test_max_cpu_1
RUBY
end

def test_symbol_proc_is_shareable
pr = :symbol.to_proc
assert_make_shareable(pr)
end

# [Bug #21775]
def test_ifunc_proc_not_shareable
h = Hash.new { self }
pr = h.to_proc
assert_unshareable(pr, /not supported yet/, exception: RuntimeError)
end

def assert_make_shareable(obj)
refute Ractor.shareable?(obj), "object was already shareable"
Ractor.make_shareable(obj)
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5 changes: 4 additions & 1 deletion vm.c
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Expand Up @@ -1594,7 +1594,10 @@ rb_proc_ractor_make_shareable(VALUE self, VALUE replace_self)
proc->is_isolated = TRUE;
}
else {
VALUE proc_self = vm_block_self(vm_proc_block(self));
const struct rb_block *block = vm_proc_block(self);
if (block->type != block_type_symbol) rb_raise(rb_eRuntimeError, "not supported yet");

VALUE proc_self = vm_block_self(block);
if (!rb_ractor_shareable_p(proc_self)) {
rb_raise(rb_eRactorIsolationError,
"Proc's self is not shareable: %" PRIsVALUE,
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