Bug #2009: File.open memory leak
http://redmine.ruby-lang.org/issues/show/2009

Author: Sven Engelhardt
Status: Open, Priority: Normal
ruby -v: ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-linux]

File.open looses 28 bytes of memory on each call:
(p72 releases the memory correctly, p160, p174 dont)

big% cat rbtest                                                             

20000.times do

File.open("/etc/passwd","r") { |f|
	f.each { |l|
		l.chomp!
	}
}

end

big% valgrind --leak-check=full /opt/valgrind/ruby/1.8.7-174/bin/ruby rbtest
==15828== Memcheck, a memory error detector.
==15828== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==15828== Using LibVEX rev 1804, a library for dynamic binary translation.
==15828== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==15828== Using valgrind-3.3.0-Debian, a dynamic binary instrumentation framework.
==15828== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==15828== For more details, rerun with: -v
==15828== 
==15828== 
==15828== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 21 from 1)
==15828== malloc/free: in use at exit: 1,334,734 bytes in 31,012 blocks.
==15828== malloc/free: 787,948 allocs, 756,936 frees, 101,067,560 bytes allocated.
==15828== For counts of detected errors, rerun with: -v
==15828== searching for pointers to 31,012 not-freed blocks.
==15828== checked 824,216 bytes.
==15828== 
==15828== 557,312 (555,744 direct, 1,568 indirect) bytes in 19,848 blocks are definitely lost in loss record 5 of 6
==15828==    at 0x4022AB8: malloc (vg_replace_malloc.c:207)
==15828==    by 0x80745B6: ruby_xmalloc (gc.c:158)
==15828==    by 0x807D02C: rb_file_open_internal (io.c:2993)
==15828==    by 0x807D1A5: rb_file_initialize (io.c:3422)
==15828==    by 0x8058053: call_cfunc (eval.c:5771)
==15828==    by 0x8061F92: rb_call0 (eval.c:5926)
==15828==    by 0x8062240: rb_call (eval.c:6173)
==15828==    by 0x80624F7: rb_obj_call_init (eval.c:7809)
==15828==    by 0x808AA99: rb_class_new_instance (object.c:1644)
==15828==    by 0x8079AEF: rb_io_s_open (io.c:3446)
==15828==    by 0x8058053: call_cfunc (eval.c:5771)
==15828==    by 0x8061F92: rb_call0 (eval.c:5926)
==15828== 
==15828== LEAK SUMMARY:
==15828==    definitely lost: 555,744 bytes in 19,848 blocks.
==15828==    indirectly lost: 1,568 bytes in 56 blocks.
==15828==      possibly lost: 0 bytes in 0 blocks.
==15828==    still reachable: 777,422 bytes in 11,108 blocks.
==15828==         suppressed: 0 bytes in 0 blocks.
==15828== Reachable blocks (those to which a pointer was found) are not shown.
==15828== To see them, rerun with: --leak-check=full --show-reachable=yes


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