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Memory leak with TracePoint on bmethod

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[Bug #20194]

When disabling the TracePoint on bmethod, the hooks list is not freed.

For example:

    obj = Object.new
    obj.define_singleton_method(:foo) {}
    bmethod = obj.method(:foo)
    tp = TracePoint.new(:return) {}

    10.times do
      100_000.times do
        tp.enable(target: bmethod) {}
      end

      puts `ps -o rss= -p #{$$}`
    end

Before:

    18208
    22832
    26528
    29728
    34000
    37776
    40864
    44400
    47680
    51504

After:

    16688
    17168
    17168
    17248
    17696
    17760
    17824
    17824
    17856
    17920
This commit is contained in:
Peter Zhu 2024-01-19 10:26:24 -05:00
parent 7cf74a2ff2
commit b14674b236
2 changed files with 14 additions and 0 deletions
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13
test/ruby/test_settracefunc.rb
View File

@ -625,6 +625,19 @@ PREP
CODE
end
def test_tracepoint_bmethod_memory_leak
assert_no_memory_leak([], '', "#{<<~"begin;"}\n#{<<~'end;'}", "[Bug #20194]", rss: true)
obj = Object.new
obj.define_singleton_method(:foo) {}
bmethod = obj.method(:foo)
tp = TracePoint.new(:return) {}
begin;
1_000_000.times do
tp.enable(target: bmethod) {}
end
end;
end
def trace_by_set_trace_func
events = []
trace = nil

1
vm_trace.c
View File

@ -1259,6 +1259,7 @@ rb_tracepoint_enable_for_target(VALUE tpval, VALUE target, VALUE target_line)
(tp->events & (RUBY_EVENT_CALL | RUBY_EVENT_RETURN))) {
if (def->body.bmethod.hooks == NULL) {
def->body.bmethod.hooks = ZALLOC(rb_hook_list_t);
def->body.bmethod.hooks->is_local = true;
}
rb_hook_list_connect_tracepoint(target, def->body.bmethod.hooks, tpval, 0);
rb_hash_aset(tp->local_target_set, target, Qfalse);