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[CLANG18] MSAN: use-of-uninitialized-value in lib_rend/lib_rend_fx.c:11230:9

Basic Info

Bug description

Clang 18 MSAN found an use-of-uninitialized-value error at lib_rend/lib_rend_fx.c:11230:9:

==18738==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x5647b9f65a3e in intermidiate_ext_dirac_render /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:11230:9
#1 0x5647b9f59db2 in renderInputMasa /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9164:21
#2 0x5647b9f2b179 in renderActiveInputsMasa /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9238:9
#3 0x5647b9f01062 in getSamplesInternal /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9594:5
#4 0x5647b9efeda5 in IVAS_REND_GetSamples /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9615:5
#5 0x5647b9ea574b in main /builds/rep/sa4/audio/ivas-basop/apps/renderer.c:1940:28
#6 0x7f4e5f9b11c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#7 0x7f4e5f9b128a in __libc_start_main csu/../csu/libc-start.c:360:3
#8 0x5647b9dfa3e4 in _start (/builds/rep/sa4/audio/ivas-basop/IVAS_rend+0x3a3e4) (BuildId: 95a4b3e2a14753d995ecbd30d0f4bf3185fc019d)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:11230:9 in intermidiate_ext_dirac_render

How to reproduce

⚠️ Make sure to use CLANG v18 for building the codec :warning

Build with

make clean
make -j CLANG=1

Then run

E subprocess.CalledProcessError: Command '['/builds/rep/sa4/audio/ivas-basop/IVAS_rend', '-i', '/builds/rep/sa4/audio/ivas-basop/scripts/testv/spectral_test_2ch_16kHz.wav', '-if', 'MASA2', '-o', '/builds/rep/sa4/audio/ivas-basop/tests/renderer_short/cut/MASA2_to_MONONone_20msNone_16kHz.wav', '-of', 'MONO', '-fs', '16', '-no_delay_cmp', '-q', '-im', '/builds/rep/sa4/audio/ivas-basop/scripts/testv/stv2MASA2TC48c.met', '-fr', '20']' returned non-zero exit status 1.

or

python3 -m pytest "test_masa[16kHz-20ms-MASA2-MONO]" -n auto --update_ref --ref_encoder_path ./IVAS_cod --ref_decoder_path ./IVAS_dec