[MonoDevelop] Memory leak

Michael Hutchinson m.j.hutchinson at gmail.com
Wed Aug 13 20:44:33 EDT 2008

On Wed, Aug 13, 2008 at 7:20 PM, Casey Marshall
<casey.s.marshall at gmail.com> wrote:
>>>> ==7947== 862,223,392 bytes in 1,737,838 blocks are still reachable in
>>>> loss record 238 of 238
>>>> ==7947==    at 0x4C21F8F: memalign (vg_replace_malloc.c:460)
>>>> ==7947==    by 0x4C22028: posix_memalign (vg_replace_malloc.c:569)
>>>> ==7947==    by 0x507D299: (within /usr/lib/libglib-2.0.so.0.1600.4)
>>>> ==7947==    by 0x507E0F0: g_slice_alloc (in
>>>> /usr/lib/libglib-2.0.so.0.1600.4)
>>>> ==7947==    by 0x506035D: g_list_prepend (in
>>>> /usr/lib/libglib-2.0.so.0.1600.4)
>>>> ==7947==    by 0x432953: mono_arch_get_allocatable_int_vars
>>>> (mini-amd64.c:910)
>>>> ==7947==    by 0x5579A9: mini_method_compile (mini.c:12490)
>>>> ==7947==    by 0x558CF8: mono_jit_compile_method (mini.c:12819)
>>>> ==7947==    by 0x42C5A2: mono_magic_trampoline (mini-trampolines.c:249)
>>>> ==7947==    by 0x415B164: ???
>>>> ==7947==    by 0x8FCA917: ???
>>>> ==7947==    by 0x85E7E9F: ???
>> Am not familiar with valgrind output. What does this mean? Is it
>> possible to see what's being leaked?
> The above is an example of one of the traces valgrind outputs (it's also by
> far the largest in terms of bytes); that is the amount of storage lost
> (though, not *exactly* lost in this case, since there are still
> apparently-active references to that data) and the trace where the bytes
> were allocated from.

Yup, the fact that the trace goes through some JIT compilation methods
makes me suspect that it's leaking JITed code. I guess we should
really talk to some runtime guys though. Also, MD dynamically compiles
and load some code (e.g.
MonoDevelop.Core.Gui.DispatchService/SyncContext does this, not sure
if there's anything else, maybe remoting too?) and though the
generated should be cached per Type, I guess there could be leaking

Michael Hutchinson

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