[zeromq-dev] Device or resource busy (mutex.hpp:90)

[pprun]

Hello,
I got the following error while running my application using czmq api:

Device or resource busy (mutex.hpp:90)
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- broker sat on one laptop. the worker and client on another over wifi
- RAM and CPU were not over load
- 48 worker threads do libcurl http requests and parse responses
- once get interesting info, extract and push to broker by call client api

What happened here?

Thanks,
Pprun