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Bug #19907

closed

Method calls with keyword arguments in eval leaks callcache and callinfo objects

Added by peterzhu2118 (Peter Zhu) 8 months ago. Updated about 2 months ago.

Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
Backport:
3.0: WONTFIX, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: DONE
[ruby-core:114932]

Description

The following script leaks callcache and callinfo objects:

def foo(a:); end

10.times do
  10_000.times do
    eval(<<~RUBY)
      foo(a: 1)
    RUBY
  end

  puts "Number of live objects: #{GC.stat(:heap_live_slots)}"
  puts "Memory usage: #{`ps -o rss= -p #{$$}`}"
  puts
end

Output is:

Number of live objects: 46248
Memory usage:  16160

Number of live objects: 65902
Memory usage:  19888

Number of live objects: 92656
Memory usage:  24032

Number of live objects: 126791
Memory usage:  28048

Number of live objects: 132919
Memory usage:  28816

Number of live objects: 180687
Memory usage:  32384

Number of live objects: 181957
Memory usage:  32464

Number of live objects: 227485
Memory usage:  34224

Number of live objects: 256101
Memory usage:  37200

Number of live objects: 274151
Memory usage:  38752

After performing a ObjectSpace.dump_all, I found that it is leaking callcache and callinfo objects that is being held on by the Object class.

{"address":"0x102ecef70", "type":"CLASS", "shape_id":2, "slot_size":160, "class":"0x102ecf8d0", "variation_count":0, "superclass":"0x102ecfd30", "real_class_name":"Object", "singleton":true, "references":[ ... ]}
{"address":"0x1030c90a0", "type":"IMEMO", "shape_id":0, "slot_size":40, "imemo_type":"callinfo", "mid":"foo", "memsize":40, "flags":{"wb_protected":true}}
{"address":"0x102fad568", "type":"IMEMO", "shape_id":0, "slot_size":40, "imemo_type":"callcache", "memsize":40, "flags":{"wb_protected":true, "old":true, "uncollectible":true, "marked":true}}

Related issues 3 (1 open — 2 closed)

Related to Ruby master - Bug #18553: Memory leak on compiling method call with kwargsClosedko1 (Koichi Sasada)Actions
Related to Ruby master - Bug #19970: Eval leaks callcache and callinfo objects on arm32 (linux)OpenActions
Related to Ruby master - Bug #20348: Memory leak with method kwargs in ERB templateClosedActions
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