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MSAN: use-of-uninitialized-value in lib_basop/basop32.c:2984:10

Basic Info

Bug description

MSAN found an use-of-uninitialized-value error at lib_basop/basop32.c:2984:10:

==20127==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x1baffe4 in L_abs /builds/rep/sa4/audio/ivas-basop/lib_basop/basop32.c:2984:10
#1 0x1a6ecac in maximum_abs_32_fx /builds/rep/sa4/audio/ivas-basop/lib_com/tools_fx.c:1984:21
#2 0xf28577 in ivas_compute_core_buffers_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_core_pre_proc_fx.c:1130:9
#3 0xf1e47d in pre_proc_ivas_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_core_pre_proc_fx.c:618:9
#4 0xedca2a in ivas_core_enc_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_core_enc_fx.c:238:9
#5 0xf5f65b in ivas_cpe_enc_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_cpe_enc_fx.c:1283:5
#6 0x5c7bf7 in ivas_enc_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_enc_fx.c:284:13
#7 0x4c7b17 in IVAS_ENC_EncodeFrameToSerial /builds/rep/sa4/audio/ivas-basop/lib_enc/lib_enc_fx.c:1502:13
#8 0x4a6cdb in main /builds/rep/sa4/audio/ivas-basop/apps/encoder.c:877:28
#9 0x7f52c1285d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#10 0x7f52c1285e3f in __libc_start_main csu/../csu/libc-start.c:392:3
#11 0x420364 in _start (/builds/rep/sa4/audio/ivas-basop/IVAS_cod+0x420364)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /builds/rep/sa4/audio/ivas-basop/lib_basop/basop32.c:2984:10 in L_abs

How to reproduce

Build with

make clean
make -j CLANG=1

Then run

IVAS_cod -masa 2 scripts/testv/ltv48_MASA2TC.met scripts/switchPaths/sw_13k2_512k.bin 48 scripts/testv/ltv48_MASA2TC.wav ltv48_MASA2TC.wav_MASA_2TC_bitrate_switching_from_13_2_kbps_to_512_kbps_48kHz_in_48kHz_out_MONO_out.192

or

python3 -m pytest "test_param_file_tests[ltv-MASA 2TC bitrate switching from 13.2 kbps to 512 kbps, 48kHz in, 48kHz out, MONO out]" -n auto --update_ref --ref_encoder_path ./IVAS_cod --ref_decoder_path ./IVAS_dec