# Meeting SDK Crashes with Assertion Failure on Linux

**URL:** <https://devforum.zoom.us/t/meeting-sdk-crashes-with-assertion-failure-on-linux/119947>\
**Category:** Meeting SDK\
**Tags:** recording, sdk\
**Created:** [October 28, 2024, 5:01pm UTC](https://devforum.zoom.us/t/meeting-sdk-crashes-with-assertion-failure-on-linux/119947 "2024-10-28T17:01:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![seungkoo](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/seungkoo/32/50456_2.png) [@seungkoo](https://devforum.zoom.us/u/seungkoo)\
**Post date:** [October 28, 2024, 5:01pm UTC](https://devforum.zoom.us/t/meeting-sdk-crashes-with-assertion-failure-on-linux/119947/1 "2024-10-28T17:01:29Z")

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zoom-meeting-sdk-linux\_x86\_64-6.2.3.2095  
zoom-meeting-sdk-linux\_x86\_64-6.1.10.1435

Zoom Meeting SDK carshes with below assertion failure:

audio\_conference\_mixer\_impl.cc:517: virtual WebRtc\_Word32 webrtc::AudioConferenceMixerImpl::Process(): Assertion `\_processCalls == 0’ failed.  
dump\_bt: 6  
./build/calbot(\_Z7dump\_bti+0x4c)[0x555555c2879c]  
/lib/x86\_64-linux-gnu/libc.so.6(+0x42520)[0x7ffff43ed520]  
/lib/x86\_64-linux-gnu/libc.so.6(pthread\_kill+0x12c)[0x7ffff44419fc]  
/lib/x86\_64-linux-gnu/libc.so.6(raise+0x16)[0x7ffff43ed476]  
/lib/x86\_64-linux-gnu/libc.so.6(abort+0xd3)[0x7ffff43d37f3]  
/lib/x86\_64-linux-gnu/libc.so.6(+0x2871b)[0x7ffff43d371b]  
/lib/x86\_64-linux-gnu/libc.so.6(+0x39e96)[0x7ffff43e4e96]  
/src/lib/zoomsdk/libmeetingsdk.so.1(\_ZN6webrtc24AudioConferenceMixerImpl7ProcessEv+0x905)[0x7ffffaa5ff75]  
/src/lib/zoomsdk/libmeetingsdk.so.1(\_ZN6webrtc3voe11OutputMixer17MixActiveChannelsEv+0x3a)[0x7ffffaa33cda]  
/src/lib/zoomsdk/libmeetingsdk.so.1(\_ZN6webrtc11VoEBaseImpl25NeedMorePlayDataFromCheckEv+0x1d)[0x7ffffaa1f7dd]  
/src/lib/zoomsdk/libmeetingsdk.so.1(\_ZN20ssb\_audio\_sdk\_it\_imp24CheckRecordThreadProcessEv+0xa2)[0x7ffffa8f3e82]  
/src/lib/zoomsdk/libmeetingsdk.so.1(\_ZN6webrtc11ThreadLinux3RunEv+0x34)[0x7ffffab9c3f4]

It happens randomly

Reproduction steps: Let bot joins a call. crash happens right after or around 1st audio frame received from the SDK.

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<div class="post-metadata">

**Author:** ![amanda-recallai](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/amanda-recallai/32/44747_2.png) [@amanda-recallai](https://devforum.zoom.us/u/amanda-recallai)\
**Post date:** [October 30, 2024, 12:45am UTC](https://devforum.zoom.us/t/meeting-sdk-crashes-with-assertion-failure-on-linux/119947/2 "2024-10-30T00:45:56Z")

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Hey @seungkoo,

Based on the stack trace & underlying assertion causing this (\_processCalls == 0), it seems that this issue might be related to threading or a race condition.

It’s hard to say why or how without seeing your code. If you could share a snippet of how you’re using the SDK to receive raw audio, this could help highlight any potential issues causing the crash.

You also might want to check out the [Recall.ai API](https://www.recall.ai/?utm_source=zoom_dev_forum&utm_medium=forum_answer&utm_campaign=ZOOM_SDK_LINUX_AUDIO_FRAME_CRASH&utm_content=Recall.ai_API).

It’s a simple 3rd party API that lets you use meeting bots to get raw audio/video/metadata from meetings without you needing to spend months to build, scale and maintain these bots.

Here are the API docs: [https://docs.recall.ai](https://docs.recall.ai)