[Samsung Galaxy Alpha] YokoBR:
The problem seems to be here:

[ 05-16 10:48:32.519 32452:19129 D/WhatsApp ]

LL_D W [1016:ReaderThread] RECV <ack from='553192936794@s.whatsapp.net' class='call' type='offer' id='7FE93B5AAF2A257A61EF2D087A3C0C'><relay call-id='76E26D8BF758941521158848F12B93'><token>%01%02%85%f4%fe%f6A%a0%c3%f7%14%ab%1e%a4%16&W7D%1bUu%dcL%e5%f1G$%dc%18No%19*%b3%ed%9e%c3%af%ed%9b\%c1%a6%fd%d1\%ea%90%b6_e%91%1fqR%fc%9a%ba46%c7%18%dc%b8%e3%a8%c6q>%c1NQ,"%f6%a7%fc_%a8%a5e/%a5%bc%e2P!e>%c5%a9%83%be%88%e9?@%92b%e8|</token><te>%1f%0dU0%0d%96*%03(%80%f2%05%00%c3%fa%ce%b0%0c%00%00%01w%0d%96</te><te>%9d%f0%0c3%0d%96*%03(%80%f2%05%02%c3%fa%ce%b0%0c%00%00%01w%0d%96</te><te>%1f%0dG0%0d%96*%03(%80%f2%12%00%c3%fa%ce%b0%0c%00%00%01w%0d%96</te><te>%1f%0dI0%0d%96*%03(%80%f2%00%00%c3%fa%ce%b0%0c%00%00%01w%0d%96</te><te>%9d%f0%000%0d%96*%03(%80%f2%00%01%c0%fa%ce%b0%0c%00%00%01w%0d%96</te></relay><aec aecm_adapt_step_size='2' algorithm='aecm' disable_agc='1' ec_off_threshold='40' ec_threshold='70' echo_detector_impl='0' echo_detector_mode='0' mode='2' offset='100'/><agc targetlevel='1' compressiongain='9' limiterenable='1' mode='0'/><bwe use_audio_packet_rate='1'/><encode cbr='0' complexity='5' non_speech_bitrate='6000' vad_threshold='30'/><ns mode='1'/><options android_call_connected_toast='1' audio_encode_offload='1' call_start_delay='1200' caller_end_call_threshold='1500' connected_if_received_data='1' enable_new_transport_stats='1' enable_upnp='1' ip_config='1' max_audio_ts_jitter_ms='-1' spam_call_threshold_seconds='55' transport_stats_p2p_threshold='0.5'/><rc low_data_usage_bitrate='14000' maxfpp_duration='10' maxrtt='2500' minfpp='3'/><re p2p_request_timeout='3000'/><rte>%bdi%b3+%d0g</rte><test name='ringing_control'/><uploadfieldstat/></ack>

[ 05-16 10:48:32.612 32452:20798 I/WhatsAppJni ]

EnsureThreadAttached: attached current thread to JVM

[ 05-16 10:48:32.616 2453: 2652 V/audio_hw_primary ]

adev_open_input_stream: enter

[ 05-16 10:48:32.616 2453: 2652 V/audio_hw_primary ]

adev_open_input_stream: exit

[ 05-16 10:48:32.620 2453:20800 I/AudioFlinger ]

AudioFlinger's thread 0xb4d83000 ready to run

[ 05-16 10:48:32.620 2453:20800 V/audio_hw_primary ]

in_standby: enter

[ 05-16 10:48:32.620 2453:20800 V/audio_hw_primary ]

in_standby: exit: status(0)

[ 05-16 10:48:32.622 2453:20800 V/audio_hw_primary ]

in_standby: enter

[ 05-16 10:48:32.622 2453:20800 V/audio_hw_primary ]

in_standby: exit: status(0)

[ 05-16 10:48:32.625 32452:32525 D/WhatsApp ]

LL_D W [880:WriterThread] SEND <call to='553192936794@s.whatsapp.net' id='73F6F721F77A93C996357B6DE26B6C'><transport call-id='76E26D8BF758941521158848F12B93'><te priority='2'>%c0%a8%01%e8%d5Z</te><net medium='2'/></transport></call>

[ 05-16 10:48:32.654 2453: 2652 E/LvveTxBundle ]

LVVEFS_Android_Wrapper: Session 441: LVVEFSLibCreate: ERROR while processing returned from LVVEFS_Create 5

[ 05-16 10:48:32.654 2453: 2652 E/LvveTxBundle ]

LVVEFS_Android_Wrapper: Session 441: Session_CreateEffect: ERROR LVVEFSLibCreate returned -5

[ 05-16 10:48:32.654 2453: 2652 E/LvveTxBundle ]

LVVEFS_Android_Wrapper: Session 441: ProcessingLib_Create: ERROR: Session_CreateEffect returned -5, AND session->createdMsk = 0

[ 05-16 10:48:32.654 2453: 2652 W/EffectsFactory ]

EffectCreate() library pre_processing: could not create fx Automatic Gain Control, error -5

[ 05-16 10:48:32.655 2453: 2652 F/libc ]

Fatal signal 11 (SIGSEGV), code 1, fault addr 0x20 in tid 2652 (Binder:2453_1)

[ 05-16 10:48:32.656 2369: 2369 W/ ]

debuggerd: handling request: pid=2453 uid=1041 gid=1005 tid=2652