Bug #9599: Fiddle::Function#call leaks memory

• Status: Closed
• Priority: Normal
• Assignee: Aaron Patterson
• ruby -v: r45270
• Backport: 1.9.3: UNKNOWN, 2.0.0: DONE, 2.1: DONE

[Nobuyoshi Nakada]

Fiddle::Function#call seems leaking memory.

With the following code:

# fiddle-memleak.rb
require 'fiddle'
n = 10
a = ["a"] * n
f = Fiddle::Function.new(Fiddle.dlopen(nil)["rb_obj_tainted"], [Fiddle::TYPE_VOIDP]*n, Fiddle::TYPE_VOID)
loop {f.call(*a); GC.start}

VSZ and RSS increase continuaslly.

$ ruby fiddle-memleak.rb & while ps -ovsz=,rss= $!; do sleep 1; done
[1] 93595
 2423344     24
 2461024   8884
 2463072  10420
 2464096  11940
 2465120  13428
 2467168  14948
 2468192  16476
 2469216  17980
 2471264  19432
 2473312  20940
 2474336  22424
 2475360  23936
 2478432  25468
 2481504  26996
 2482528  28468
 2483552  29984
 2485600  31524
 2486624  33056
 2487652  34568
 2488676  36100
 2490724  37628
 2491748  39152

RGenGC seems unrelated since the result in 2.0.0 is similar.

[Heesob Park]

Because Fiddle::Pointer class was alloced with TypedData_Make_Struct macro, it must be freed with ruby_xfree.
Same applies to ext/fiddle/handle.c, ext/dl/cptr.c and ext/dl/handle.c
Here is a patch.

diff --git a/pointer.c b/pointer.c
index 0a914dd..99c7596 100644
--- a/pointer.c
+++ b/pointer.c
@@ -65,6 +65,7 @@ fiddle_ptr_free(void ptr)
((data->free))(data->ptr);
}
}
+ ruby_xfree(ptr);
}

static size_t

[Nobuyoshi Nakada]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

Applied in changeset r45291.

---

ext/dl, ext/fiddle: fix memory leak

• ext/dl/cptr.c (dlptr_free), ext/dl/handle.c (dlhandle_free), ext/fiddle/handle.c (fiddle_handle_free), ext/fiddle/pointer.c (fiddle_ptr_free): fix memory leak. based on the patch Heesob Park at [Bug #9599].

[Tomoyuki Chikanaga]

• Backport changed from 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN to 1.9.3: UNKNOWN, 2.0.0: REQUIRED, 2.1: REQUIRED

[Tomoyuki Chikanaga]

Add r45301

[Tomoyuki Chikanaga]

r40930 and r45298 were backported to ruby_2_0_0 (at r45371 and r45372) to resolv conflicts.

And I want to backport r45291, r45299, r45301, r45314, r45315 and r45325, but with them dl and fiddle tests fail. I wonder if there are any other memory leaks.

[Tomoyuki Chikanaga]

r45311 was also backported to ruby_2_0_0. It fixes a bug introduced by r45298.

[Tomoyuki Chikanaga]

• Backport changed from 1.9.3: UNKNOWN, 2.0.0: REQUIRED, 2.1: REQUIRED to 1.9.3: UNKNOWN, 2.0.0: REQUIRED, 2.1: DONE

r45291, r45299, r45314 and r45325 were backported into ruby_2_1 at 45820.

[Usaku NAKAMURA]

backported into ruby_2_0_0 at r46508.

[Usaku NAKAMURA]

• Backport changed from 1.9.3: UNKNOWN, 2.0.0: REQUIRED, 2.1: DONE to 1.9.3: UNKNOWN, 2.0.0: DONE, 2.1: DONE