mediasoup Assert fail in webrtc::PacedSender::SetPacingRates

Bug Report

Your environment

Operating system: CentOS 7.9
Node version: v16.13.2
npm version: 8.1.2
gcc/clang version: gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC)
mediasoup version: 3.9.6
mediasoup-client version: 3.6.50

Issue description

I'm building an application where multiple peers could join into a room. Each peer has a send and receive transport. On the send transport there is a video producer, data producer and audio producer. On the receive transport there is a data consumer, and video + audio consumers for each other peer.

Sometimes on a test server which runs on a ppc64le architecture (a POWER9 processor) the worker process crashes when a peer with Safari (15.1) is involved. However when there are only Firefox and Chrome peers it works great.

This is what I see in the logs:

mediasoup:Consumer resume() +128ms
mediasoup:Channel request() [method:consumer.resume, id:136] +128ms
mediasoup:ERROR:Channel [pid:25299 webrtc::GoogCcNetworkController::ClampConstraints() | start bitrate smaller than min bitrate [starting_rate_:600000, min_data_rate_:3759722167506709858] +2s
mediasoup:ERROR:Worker (stderr) (ABORT) webrtc::PacedSender::SetPacingRates() | failed assertion `pacing_rate_bps > 0': pacing rate must be > 0 +0ms
mediasoup:PayloadChannel Consumer PayloadChannel ended by the worker process +15ms
mediasoup:PayloadChannel Producer PayloadChannel ended by the worker process +1ms
mediasoup:Channel Consumer Channel ended by the worker process +4ms
mediasoup:ERROR:Channel Producer Channel error: Error: read ECONNRESET +4ms
mediasoup:ERROR:Worker worker process died unexpectedly [pid:25299, code:null, signal:SIGABRT] +0ms
mediasoup:Worker died() [error:Error: [pid:25299, code:null, signal:SIGABRT]] +2m

And this is the backtrace from the core dump:

#0  0x00007fff95bdfcb0 in raise () from /lib64/libc.so.6
No symbol table info available.
#1  0x00007fff95be200c in abort () from /lib64/libc.so.6
No symbol table info available.
#2  0x000000013fd0e2b4 in webrtc::PacedSender::SetPacingRates(unsigned int, unsigned int) ()
No symbol table info available.
#3  0x000000013fd07360 in webrtc::RtpTransportControllerSend::PostUpdates(webrtc::NetworkControlUpdate) ()
No symbol table info available.
#4  0x000000013fd07968 in webrtc::RtpTransportControllerSend::UpdateControllerWithTimeInterval() ()
No symbol table info available.
#5  0x000000013fd07c88 in webrtc::RtpTransportControllerSend::MaybeCreateControllers() ()
No symbol table info available.
#6  0x000000013fd07de8 in webrtc::RtpTransportControllerSend::RegisterTargetTransferRateObserver(webrtc::TargetTransferRateObserver*) ()
No symbol table info available.
#7  0x000000013f9b7ca8 in RTC::TransportCongestionControlClient::InitializeController() ()
No symbol table info available.
#8  0x000000013f9b8334 in RTC::TransportCongestionControlClient::TransportConnected() ()
No symbol table info available.
#9  0x000000013f99f510 in RTC::Transport::Connected() ()
No symbol table info available.
#10 0x000000013f9cc4d0 in RTC::WebRtcTransport::OnDtlsTransportConnected(RTC::DtlsTransport const*, RTC::SrtpSession::CryptoSuite, unsigned char*, unsigned long, unsigned char*, unsigned long, std::string&) ()
No symbol table info available.
#11 0x000000013f907ea0 in RTC::DtlsTransport::ProcessDtlsData(unsigned char const*, unsigned long) ()
No symbol table info available.
#12 0x000000013f9c8afc in RTC::WebRtcTransport::OnUdpSocketPacketReceived(RTC::UdpSocket*, unsigned char const*, unsigned long, sockaddr const*) ()
No symbol table info available.
#13 0x000000013f9be284 in RTC::UdpSocket::UserOnUdpDatagramReceived(unsigned char const*, unsigned long, sockaddr const*) ()
No symbol table info available.
#14 0x000000013f8aeba8 in onRecv(uv_udp_s*, long, uv_buf_t const*, sockaddr const*, unsigned int) ()
No symbol table info available.
#15 0x000000013fc6ef38 in uv__udp_recvmmsg ()
No symbol table info available.
#16 0x000000013fc6fecc in uv__udp_io ()
No symbol table info available.
#17 0x000000013fc74ce4 in uv__io_poll ()
No symbol table info available.
#18 0x000000013fc626ac in uv_run ()
No symbol table info available.
#19 0x000000013f88c258 in DepLibUV::RunLoop() ()
No symbol table info available.
#20 0x000000013f89bec0 in Worker::Worker(Channel::ChannelSocket*, PayloadChannel::PayloadChannelSocket*) ()
No symbol table info available.
#21 0x000000013f88a58c in mediasoup_worker_run ()
No symbol table info available.
#22 0x000000013f8892dc in main ()
No symbol table info available.

Feb 10 '22 12:02 Sir3dDeVi

Thanks for the report,

Definitely the issue is within the libwebrtc code dependency that we are willing to get rid of when possible. I don't think we can get the resources to dig into this one, being related to a specific architecture, but feel free to provide the corresponding PR.

Feb 17 '22 10:02 jmillan

Ok, thank you. I will try to look into the issue.

Feb 18 '22 11:02 Sir3dDeVi

@VictoriousV I had the same issue. I think the problem is your gcc version, as per installation instructions, you need gcc and g++ >= 4.9. You can install the devtoolset 9. sudo yum install devtoolset-9 scl enable devtoolset-9 -- bash After that, remove your node_modules folder and try installing again mediasoup.

Apr 14 '22 12:04 RoCkAs

@RoCkAs Thank you for the suggestion! It seems that it solved the issue. Thanks again! :)

Oct 24 '22 12:10 Sir3dDeVi