# Mediasoup Worker Unexpectedly Died in v3.16.1

**URL:** <https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741>\
**Category:** mediasoup libraries\
**Created:** [June 28, 2025, 8:12am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741 "2025-06-28T08:12:39Z")\
**Posts on this page:** 15\
**Page:** 1

<div class="post-metadata">

**Author:** ![miroslavpejic85](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/miroslavpejic85/32/1044_2.png) [@miroslavpejic85](https://mediasoup.discourse.group/u/miroslavpejic85)\
**Post date:** [June 28, 2025, 8:12am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/1 "2025-06-28T08:12:39Z")

</div>

Hi team,

After upgrading to **Mediasoup v3.16.1** , I started experiencing a critical issue where the **worker dies unexpectedly** when a user attempts to join a room.

Here’s a snippet from my logs:

```auto
[6/28/2025, 08:01:52:620] [Server] Mediasoup worker died, exiting in 2 seconds...

```

Has anything changed in v3.16.1 that could be related to this behavior?

Note: On mediasoup 3.16.0 seems not happen.

Thank you!

---

<div class="post-metadata">

**Author:** ![jmillan](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/jmillan/32/9_2.png) [@jmillan](https://mediasoup.discourse.group/u/jmillan)\
**Post date:** [June 28, 2025, 8:31am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/2 "2025-06-28T08:31:59Z")

</div>

@miroslavpejic85,

Do you have an SRT in the mediasoup-demo? Otherwise, can you please share the coredump?

---

<div class="post-metadata">

**Author:** ![miroslavpejic85](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/miroslavpejic85/32/1044_2.png) [@miroslavpejic85](https://mediasoup.discourse.group/u/miroslavpejic85)\
**Post date:** [June 28, 2025, 8:51am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/3 "2025-06-28T08:51:05Z")

</div>

Hi jmillan,

**Actually `mediasoup-demo` is experiencing an issue with `WebSocket`.**

On my end, would the following log be sufficient for your investigation, or do you also need the core dump to analyze it further?

```js
mediasoup:ERROR:Worker (stderr) libc++abi: terminating due to uncaught exception of type std::out_of_range: absl::container_internal::raw_hash_map<>::at undefined
mediasoup:Consumer resume()
mediasoup:Channel request() [method:CONSUMER_RESUME]
mediasoup:Channel Consumer Channel ended by the worker process
mediasoup:Channel Producer Channel ended by the worker process
mediasoup:ERROR:Worker worker process died unexpectedly [pid:9639, code:null, signal:SIGABRT]
mediasoup:Worker workerDied() [error:Error: [pid:9639, code:null, signal:SIGABRT]]
mediasoup:Channel close()
mediasoup:Router workerClosed()
mediasoup:Transport routerClosed()
mediasoup:Producer transportClosed()

```

---

<div class="post-metadata">

**Author:** ![jmillan](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/jmillan/32/9_2.png) [@jmillan](https://mediasoup.discourse.group/u/jmillan)\
**Post date:** [June 28, 2025, 9:22am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/4 "2025-06-28T09:22:00Z")

</div>

> or do you also need the core dump to analyze it further?

If you can yes, please. We would go directly to the problem.

---

<div class="post-metadata">

**Author:** ![jmillan](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/jmillan/32/9_2.png) [@jmillan](https://mediasoup.discourse.group/u/jmillan)\
**Post date:** [June 28, 2025, 9:29am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/5 "2025-06-28T09:29:18Z")

</div>

> [@miroslavpejic85](#):
>
> or do you also need the core dump to analyze it further?

We don’t need the core dump itself. The output of `bt full` would suffice.

---

<div class="post-metadata">

**Author:** ![miroslavpejic85](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/miroslavpejic85/32/1044_2.png) [@miroslavpejic85](https://mediasoup.discourse.group/u/miroslavpejic85)\
**Post date:** [June 28, 2025, 10:29am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/6 "2025-06-28T10:29:58Z")

</div>

From the backtrace, the crash is a SIGABRT triggered inside:

```auto
RTC::SimulcastConsumer::SendRtpPacket()

```

with an abort caused by:

```auto
absl::lts_20240722::base_internal::ThrowStdOutOfRange(char const*)

```

which means somewhere in the mediasoup code (or its dependencies) there’s an out-of-range access, very likely with an absl::flat\_hash\_map::at() call.

`coredumps`:

```auto
{"app_name":"mediasoup-worker","timestamp":"2025-06-28 11:59:37.00 +0200","app_version":"","slice_uuid":"54898629-572b-3955-828d-3fa88217d309","build_version":"","platform":1,"share_with_app_devs":0,"is_first_party":1,"bug_type":"309","os_version":"macOS 15.5 (24F74)","roots_installed":0,"incident_id":"EBB5F196-8901-43A2-8EF1-90C4923BB6EB","name":"mediasoup-worker"}
{
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  "version" : 2,
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  "captureTime" : "2025-06-28 11:59:36.6392 +0200",
  "codeSigningMonitor" : 0,
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  "pid" : 50949,
  "cpuType" : "X86-64",
  "roots_installed" : 0,
  "bug_type" : "309",
  "procLaunch" : "2025-06-28 11:59:20.6195 +0200",
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  "appleIntelligenceStatus" : {"reasons":["deviceNotCapable"],"state":"unavailable"},
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  "codeSigningID" : "",
  "codeSigningTeamID" : "",
  "codeSigningValidationCategory" : 0,
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}
}

```

Thank you!

---

<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [June 28, 2025, 10:58am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/7 "2025-06-28T10:58:44Z")

</div>

Can we please move this to GitHub issues?

---

<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [June 28, 2025, 11:04am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/8 "2025-06-28T11:04:08Z")

</div>

Issue created here: [Worker crash: 'std::out\_of\_range' in `absl::container_internal::raw_hash_map\<\>::at undefined` · Issue #1554 · versatica/mediasoup · GitHub](https://github.com/versatica/mediasoup/issues/1554)

---

<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [June 28, 2025, 11:09am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/9 "2025-06-28T11:09:04Z")

</div>

I’ve included a core dump in the issue: [Worker crash: 'std::out\_of\_range' in `absl::container_internal::raw_hash_map\<\>::at undefined` · Issue #1554 · versatica/mediasoup · GitHub](https://github.com/versatica/mediasoup/issues/1554)

---

<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [June 28, 2025, 4:54pm UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/10 "2025-06-28T16:54:51Z")

</div>

Fix here after a one2one session with @jmillan:

> <https://github.com/versatica/mediasoup/pull/1555>
>
> \## Details
> 
> \- Fixes #1554

---

<div class="post-metadata">

**Author:** ![miroslavpejic85](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/miroslavpejic85/32/1044_2.png) [@miroslavpejic85](https://mediasoup.discourse.group/u/miroslavpejic85)\
**Post date:** [June 29, 2025, 9:12pm UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/11 "2025-06-29T21:12:06Z")

</div>

I’m still experiencing a crash in the mediasoup worker for same reason, even after upgrading to the latest version (v3.16.3).

---

<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [June 29, 2025, 9:30pm UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/12 "2025-06-29T21:30:20Z")

</div>

I did tons of tests and it never crashes. Please comment in the GH issue and paste the error log you see in there:

> <https://github.com/versatica/mediasoup/issues/1554>
>
> \# Bug Report
> 
> \## Your environment
> 
> \- Operating system: Linux Debian
> \- gcc/clang …version: gcc 12.2.0 (Debian 12.2.0-14)
> \- mediasoup version: 3.16.1
> 
> \## Issue description
> 
> mediasoup-demo crashes with this error:
> 
> \`\`\`
> 2025-06-26T14:35:13.386Z mediasoup:ERROR:Worker (stderr) terminate called after throwing an instance of 'std::out\_of\_range' undefined
> 2025-06-26T14:35:13.388Z mediasoup:ERROR:Worker (stderr) what(): absl::container\_internal::raw\_hash\_map\<\>::at undefined
> 2025-06-26T14:35:13.419Z mediasoup:ERROR:Channel Producer Channel error: Error: read ECONNRESET undefined
> 2025-06-26T14:35:13.439Z mediasoup:ERROR:Worker worker process died unexpectedly \[pid:3452214, code:null, signal:SIGABRT\] undefined
> \`\`\`
> 
> Also reported in the forum: https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741
> 
> \### Core dump
> 
> \`\`\`
> (gdb) bt full
> \#0 \_\_pthread\_kill\_implementation (threadid=\<optimized out\>, signo=signo@entry=6, no\_tid=no\_tid@entry=0) at ./nptl/pthread\_kill.c:44
> tid = \<optimized out\>
> ret = 0
> pd = \<optimized out\>
> old\_mask = {\_\_val = {140720918794352}}
> ret = \<optimized out\>
> \#1 0x00007f2462dcad9f in \_\_pthread\_kill\_internal (signo=6, threadid=\<optimized out\>) at ./nptl/pthread\_kill.c:78
> No locals.
> \#2 0x00007f2462d7bf32 in \_\_GI\_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
> ret = \<optimized out\>
> \#3 0x00007f2462d66472 in \_\_GI\_abort () at ./stdlib/abort.c:79
> save\_stage = 1
> act = {\_\_sigaction\_handler = {sa\_handler = 0x20, sa\_sigaction = 0x20}, sa\_mask = {\_\_val = {18446744073709551615, 13835058058503389184, 13835058058503389184, 18446744073709551615, 
> 18446603336221196287, 13835058058503389184, 13835058058503389184, 93978900237968, 1152518615, 25353, 139794254143209, 139794255525504, 139794254144243, 139794255525504, 10, 
> 139794253604032}}, sa\_flags = 1658574970, sa\_restorer = 0x55792b348e78}
> \#4 0x00007f246309d919 in ?? () from /lib/x86\_64-linux-gnu/libstdc++.so.6
> No symbol table info available.
> \#5 0x00007f24630a8e1a in ?? () from /lib/x86\_64-linux-gnu/libstdc++.so.6
> No symbol table info available.
> \#6 0x00007f24630a8e85 in std::terminate() () from /lib/x86\_64-linux-gnu/libstdc++.so.6
> No symbol table info available.
> \#7 0x00007f24630a90d8 in \_\_cxa\_throw () from /lib/x86\_64-linux-gnu/libstdc++.so.6
> No symbol table info available.
> \#8 0x0000557928cccc39 in absl::lts\_20240722::base\_internal::ThrowStdOutOfRange(char const\*) ()
> No symbol table info available.
> \#9 0x0000557928df22fb in RTC::SimulcastConsumer::SendRtpPacket(RTC::RtpPacket\*, std::shared\_ptr\<RTC::RtpPacket\>&) ()
> No symbol table info available.
> \#10 0x0000557928df2924 in RTC::SimulcastConsumer::SendRtpPacket(RTC::RtpPacket\*, std::shared\_ptr\<RTC::RtpPacket\>&) ()
> No symbol table info available.
> \#11 0x0000557928da0362 in RTC::Router::OnTransportProducerRtpPacketReceived(RTC::Transport\*, RTC::Producer\*, RTC::RtpPacket\*) ()
> No symbol table info available.
> \#12 0x0000557928d8b2db in RTC::Producer::ReceiveRtpPacket(RTC::RtpPacket\*) ()
> No symbol table info available.
> \#13 0x0000557928e05651 in RTC::Transport::ReceiveRtpPacket(RTC::RtpPacket\*) ()
> No symbol table info available.
> \#14 0x0000557928e2fefe in RTC::WebRtcTransport::OnRtpDataReceived(RTC::TransportTuple\*, unsigned char const\*, unsigned long) ()
> No symbol table info available.
> \#15 0x0000557928e25a02 in RTC::WebRtcServer::OnUdpSocketPacketReceived(RTC::UdpSocket\*, unsigned char const\*, unsigned long, sockaddr const\*) ()
> No symbol table info available.
> \#16 0x000055792914ac4d in uv.udp\_recvmmsg ()
> \`\`\`

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<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [June 29, 2025, 9:31pm UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/13 "2025-06-29T21:31:07Z")

</div>

And also comment (in the GH issue) which codec you are using for video, etc.

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<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [July 4, 2025, 8:24am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/14 "2025-07-04T08:24:42Z")

</div>

Bug has been completely fixed in PR [`Consumer` classes: Really fix target layer retransmission buffer by ibc · Pull Request #1558 · versatica/mediasoup · GitHub](https://github.com/versatica/mediasoup/pull/1558), now merged. New release soon.

---

<div class="post-metadata">

**Author:** ![miroslavpejic85](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/miroslavpejic85/32/1044_2.png) [@miroslavpejic85](https://mediasoup.discourse.group/u/miroslavpejic85)\
**Post date:** [July 4, 2025, 10:14am UTC](https://mediasoup.discourse.group/t/mediasoup-worker-unexpectedly-died-in-v3-16-1/6741/15 "2025-07-04T10:14:29Z")

</div>

It seems the issue is no longer occurring, I’ll continue to monitor it throughout the day.

Thank you so much for the great work!