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Bug 736502 - Leak when marshaling caller-allocated GValues from Python implemented vfuncs
Leak when marshaling caller-allocated GValues from Python implemented vfuncs
Product: pygobject
Classification: Bindings
Component: introspection
Other Linux
: Normal normal
: ---
Assigned To: Nobody's working on this now (help wanted and appreciated)
Python bindings maintainers
Depends on:
Blocks: 693111
Reported: 2014-09-11 20:03 UTC by Simon Feltman
Modified: 2018-01-10 20:46 UTC
See Also:
GNOME target: ---
GNOME version: ---

Description Simon Feltman 2014-09-11 20:03:49 UTC
make check.valgrind TEST_NAMES=test_gi.TestPythonGObject.test_vfunc_return_ref_count

==12923== 24 bytes in 1 blocks are definitely lost in loss record 376 of 5,117
==12923==    at 0x4C2745D: malloc (in /usr/lib64/valgrind/
==12923==    by 0x132C8DE6: g_malloc (gmem.c:97)
==12923==    by 0x132E1A22: g_slice_alloc (gslice.c:1007)
==12923==    by 0x132E1A62: g_slice_alloc0 (gslice.c:1032)
==12923==    by 0x123F64BC: pygi_arg_gvalue_from_py_marshal (pygi-struct-marshal.c:119)
==12923==    by 0x123F67BF: pygi_arg_struct_from_py_marshal (pygi-struct-marshal.c:241)
==12923==    by 0x123F6BAF: arg_struct_from_py_marshal_adapter (pygi-struct-marshal.c:329)
==12923==    by 0x123E7B6A: _pygi_closure_set_out_arguments (pygi-closure.c:508)
==12923==    by 0x123E7E30: _pygi_closure_handle (pygi-closure.c:592)
==12923==    by 0x135D3B7A: ffi_closure_unix64_inner (in /usr/lib64/
==12923==    by 0x135D3EF3: ffi_closure_unix64 (in /usr/lib64/
==12923==    by 0x13E0170F: gi_marshalling_tests_object_vfunc_caller_allocated_out_parameter (gimarshallingtests.c:4334)
==12923==    by 0x135D3D8B: ffi_call_unix64 (in /usr/lib64/
==12923==    by 0x135D36BB: ffi_call (in /usr/lib64/
==12923==    by 0x123EB5B3: pygi_invoke_c_callable (pygi-invoke.c:628)
==12923==    by 0x123EC893: _function_cache_invoke_real (pygi-cache.c:714)
==12923==    by 0x123ECA92: pygi_function_cache_invoke (pygi-cache.c:793)
==12923==    by 0x123EB6B5: pygi_callable_info_invoke (pygi-invoke.c:671)
==12923==    by 0x123EB7F9: _wrap_g_callable_info_invoke (pygi-invoke.c:708)
==12923==    by 0x123D8715: _callable_info_call (pygi-info.c:557)

I believe the problem is we don't take into account caller allocated memory for the GValue which may be held in arg->v_pointer:
Comment 1 GNOME Infrastructure Team 2018-01-10 20:46:45 UTC
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