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Meaning of EPOLL_CTL_DEL error in logs

Alexandre 2017-10-16 16:27:13 UTC in Nimble Streamer

Hi,

I'm diagnosing a performance impact on some of our nimble streamers and have multiple lines similar to these ones in the logs :

[2017-10-16 11:59:12 P5690-T5692] [work1] E: invalid fd=127 event=4 received from selector
[2017-10-16 11:59:12 P5690-T5692] [work1] E: epoll_ctl epfd=9 EPOLL_CTL_DEL failed for fd=127 (errno=1)
[2017-10-16 12:02:36 P5690-T5692] [work1] E: invalid fd=54 event=4 received from selector
[2017-10-16 12:02:36 P5690-T5692] [work1] E: epoll_ctl epfd=9 EPOLL_CTL_DEL failed for fd=54 (errno=1)

Can somebody help me figure out what they mean?

Alex Pokotilo 2017-10-16 22:26:59 UTC

Sometimes on high/middle or even low load linux kernel have several event for given socket in the epoll queue. If Nimble removes socket from processing and after that new even from queue is received you will get such messages. Just ignore them

Alexandre 2017-10-21 22:40:20 UTC

OK, Thank you:)

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