Hi All, I searched around for details and references for a similar error 
and could not find anything. I am posting here to see if someone has any 
pointers to help me discover the root cause.

A GO 1.15.4 executable encountered a panic and generated a core file. Using 
'dlv' to analyze the core file, I found:

(dlv) bt
0  0x000000000047ee01 in internal/poll.runtime_pollOpen
   at runtime/netpoll.go:144
(dlv) frame 0
> internal/poll.runtime_pollOpen() runtime/netpoll.go:144 (PC: 0x47ee01)
Warning: debugging optimized function
Frame 0: runtime/netpoll.go:144 (PC: 47ee01)
(dlv) args
fd = 0
~r1 = (unreadable empty OP stack)
~r2 = (unreadable empty OP stack)

The source code for the above is here:

https://github.com/golang/go/blob/go1.15.4/src/runtime/netpoll.go#L144 

I have used the 'latest' and 1.6.0 of 'delve' both report the same details.

Not much else existed. Any suggestions on how one could go about trying to 
gain more insight into root cause? I have only encountered this once so far.

Thanks,
Mike

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