### Basic Info - Commit SHA: 5bfd9e0b10f45aa8a90f1b3b022c0433ed18c1c3 ### Bug description Clang 18 MSAN found an use-of-uninitialized-value error at lib_dec/ivas_mc_param_dec_fx.c:3409:26: ``` ==20762==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5595c2d8c8ad in ivas_param_mc_dequantize_cov_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:3409:26 #1 0x5595c2d73c68 in ivas_param_mc_get_mixing_matrices_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:2837:5 #2 0x5595c2d70e0b in ivas_param_mc_dec_prepare_renderer /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:1842:21 #3 0x5595c2ce4d43 in ivas_dec_prepare_renderer_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_jbm_dec_fx.c:3840:13 #4 0x5595c28b4039 in IVAS_DEC_PrepareRenderer /builds/rep/sa4/audio/ivas-basop/lib_dec/lib_dec_fx.c:4610:9 #5 0x5595c2848378 in decodeG192 /builds/rep/sa4/audio/ivas-basop/apps/decoder.c:2329:32 #6 0x5595c282bc82 in main /builds/rep/sa4/audio/ivas-basop/apps/decoder.c:684:17 #7 0x7f2e06baa1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16 #8 0x7f2e06baa28a in __libc_start_main csu/../csu/libc-start.c:360:3 #9 0x5595c278d484 in _start (/builds/rep/sa4/audio/ivas-basop/IVAS_dec+0x3b484) (BuildId: dc6ade48efbaef05ff2ecb1f03e3fcc0d0df194c) SUMMARY: MemorySanitizer: use-of-uninitialized-value /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:3409:26 in ivas_param_mc_dequantize_cov_fx ``` ### How to reproduce :warning: Make sure to use CLANG v18 for building the codec :warning Build with ``` make clean make -j CLANG=1 ``` Then run ``` IVAS_cod -mc 5_1_2 80000 48 scripts/testv/stv512MC48c.wav stv512MC48c.wav_Multi_channel_5_1_2_at_80_kbps_48kHz_in_48kHz_out_5_1_out.192 IVAS_dec -fr 20 5_1 48 stv512MC48c.wav_Multi_channel_5_1_2_at_80_kbps_48kHz_in_48kHz_out_5_1_out.192 stv512MC48c.wav_Multi_channel_5_1_2_at_80_kbps_48kHz_in_48kHz_out_5_1_out.dec.wav ``` or ``` python3 -m pytest "test_param_file_tests[stv-Multi-channel 5_1_2 at 80 kbps, 48kHz in, 48kHz out, 5_1 out]" -n auto --update_ref --ref_encoder_path ./IVAS_cod --ref_decoder_path ./IVAS_dec ```