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pkg/53508: lang/rust still fails with high -j values

>Number:         53508
>Category:       pkg
>Synopsis:       lang/rust still fails with high -j values
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 10 17:15:00 +0000 2018
>Originator:     John Klos
>Release:        NetBSD 8.0
System: NetBSD 8.0_STABLE NetBSD 8.0_STABLE (DOHEE) #0: Tue Aug  7 22:48:23 UTC 2018 amd64
Architecture: amd64
Machine: amd64
Attempting to compile rust from lang/rust fails with high -j values. Sometimes the 
rustc processes park, and sometimes they just chew CPU.

   Compiling proc_macro v0.0.0 
   Compiling syntax_ext v0.0.0 

22156 root      28    0   253M   43M CPU/15    19.4H 99.02% 99.02% rustc

This is on an 8 core AMD Ryzen.

Compile lang/rust with -j 16
Compile with -j 1 or -j 2


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