h2o mruby hello example leaks memory

[mingodad]

Hello !
I just did a fresh build of h2o and tested it with httpress/ab and the memory usage only gorws at each request, till I kill it to not freeze my computer.

Probably the problem is with mruby module, the hello.rb example only show it.

Cheers !

examples/h2o_mruby/h2o.conf with logs redirected to /dev/null

# to find out the configuration commands, run: h2o --help

listen: 8080
listen:
  port: 8081
  ssl:
    certificate-file: examples/h2o/server.crt
    key-file: examples/h2o/server.key
hosts:
  "127.0.0.1.xip.io:8080":
    paths:
      /:
        file.dir: examples/doc_root
        mruby.handler-file: examples/h2o_mruby/hello.rb
    access-log: /dev/null
  "alternate.127.0.0.1.xip.io:8081":
    listen:
      port: 8081
      ssl:
        certificate-file: examples/h2o/alternate.crt
        key-file: examples/h2o/alternate.key
    paths:
      /:
        file.dir: examples/doc_root.alternate
    access-log: /dev/null

./h2o --conf=examples/h2o_mruby/h2o.conf

httpress -t 2 -n 500000 -c 50 -k http://127.0.0.1:8080/hello
ab -n 500000 -c 50 -k http://127.0.0.1:8080/hello

[kazuho]

Thank you for noticing the issue.

It seems like a regression in 1.7.0-beta series (reproducible on master but not on v1.6.x branch).

[kazuho]

It has been identified that there was a case GC arena was not released. https://gist.github.com/kazuho/3df214c80b1d0404ab94 fixes the issue, but I will adjust how the arena is maintained to make leaks less likely to happen.

[kazuho]

Closing as fixed. Please reopen if the problem persists.