NetBSD Problem Report #53508

From john@anath.zia.io  Fri Aug 10 17:11:10 2018
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Date: Fri, 10 Aug 2018 17:11:06 GMT
From: john@ziaspace.com
Reply-To: john@ziaspace.com
To: gnats-bugs@NetBSD.org
Subject: lang/rust still fails with high -j values
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>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
>Organization:

>Environment:


System: NetBSD dohee.nextvr.com 8.0_STABLE NetBSD 8.0_STABLE (DOHEE) #0: Tue Aug  7 22:48:23 UTC 2018  john@dohee.zia.io:/usr/obj-amd64/sys/arch/amd64/compile/DOHEE amd64
Architecture: amd64
Machine: amd64
>Description:

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 
(file:///usr/pkgsrc/lang/rust/work/rustc-1.28.0-src/src/libproc_macro)
   Compiling syntax_ext v0.0.0 
(file:///usr/pkgsrc/lang/rust/work/rustc-1.28.0-src/src/libsyntax_ext)

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

This is on an 8 core AMD Ryzen.

>How-To-Repeat:

Compile lang/rust with -j 16
>Fix:

Compile with -j 1 or -j 2

>Unformatted:

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