From: Tanaka Akira <akr@...>
Date: 2007-09-24T18:24:04+09:00
Subject: [ruby-dev:31840] valgrind fiber

test_fiber.rb を valgrind 下で動かすと Invalid read of size 4 になるのですが、
縮めると以下で再現できるようです。

% cat y.rb
require 'fiber'

Fiber.new do
  return
end.resume
% valgrind ./ruby y.rb
...
==15272== Invalid read of size 4
==15272==    at 0x80ECB1A: vm_throw (insnhelper.ci:1290)
==15272==    by 0x80F2053: vm_eval (insns.def:1177)
==15272==    by 0x80F5A11: vm_eval_body (vm.c:1162)
==15272==    by 0x80EEA93: invoke_block (vm.c:582)
==15272==    by 0x80EEC15: vm_invoke_proc (vm.c:621)
==15272==    by 0x80FCF6E: rb_fiber_start (cont.c:576)
==15272==    by 0x805A46E: ruby_exec_node (eval.c:231)
==15272==    by 0x805A4E7: ruby_run_node (eval.c:256)
==15272==    by 0x80576F4: main (main.c:46)
==15272==  Address 0x4306CC0 is not stack'd, malloc'd or (recently) free'd
y.rb:4:in `block in <main>': unexpected return (LocalJumpError)
==15272== 
==15272== ERROR SUMMARY: 9 errors from 9 contexts (suppressed: 19 from 1)
==15272== malloc/free: in use at exit: 396,336 bytes in 6,565 blocks.
==15272== malloc/free: 6,994 allocs, 429 frees, 976,728 bytes allocated.
==15272== For counts of detected errors, rerun with: -v
==15272== searching for pointers to 6,565 not-freed blocks.
==15272== checked 703,584 bytes.
==15272== 
==15272== LEAK SUMMARY:
==15272==    definitely lost: 0 bytes in 0 blocks.
==15272==      possibly lost: 68 bytes in 1 blocks.
==15272==    still reachable: 396,268 bytes in 6,564 blocks.
==15272==         suppressed: 0 bytes in 0 blocks.
==15272== Reachable blocks (those to which a pointer was found) are not shown.
==15272== To see them, rerun with: --show-reachable=yes
-- 
[田中 哲][たなか あきら][Tanaka Akira]