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Created attachment 3219 [details]
Compile & run the provided test case.
Use Instruments to take periodic snapshots. Watch how memory usage increases as time goes by.
The leak is here (this is from mono 56275bc16bf2ab007ae7f943ffe746dadde27dc1):
0 libsystem_c.dylib malloc
1 mono monoeg_malloc /mono/ios/mono-branches/public-master/eglib/src/gmem.c:73
2 mono monoeg_g_hash_table_insert_replace /mono/ios/mono-branches/public-master/eglib/src/ghashtable.c:258
3 mono mono_gc_change_weak_track_handle /mono/ios/mono-branches/public-master/mono/metadata/boehm-gc.c:629
4 mono mono_gc_run_finalize /mono/ios/mono-branches/public-master/mono/metadata/gc.c:144
5 mono GC_invoke_finalizers /mono/ios/mono-branches/public-master/libgc/finalize.c:787
6 mono finalizer_thread /mono/ios/mono-branches/public-master/mono/metadata/gc.c:1138
7 mono start_wrapper /mono/ios/mono-branches/public-master/mono/metadata/threads.c:589
8 mono thread_start_routine /mono/ios/mono-branches/public-master/mono/io-layer/wthreads.c:286
9 mono inner_start_thread /mono/ios/mono-branches/public-master/mono/utils/mono-threads-posix.c:49
10 mono GC_start_routine /mono/ios/mono-branches/public-master/libgc/pthread_support.c:1510
11 libsystem_c.dylib _pthread_start
12 libsystem_c.dylib thread_start
The problem is that objects aren't removed from domain->track_resurrection_objects_hash (they're removed in the dtor, but the immediately readded. Since the dtor is only executed once, they're not re-removed).
This only happens with boehm, not sgen.
Fixed on master, let's leave it there for some time before we promote to stable.