NetBSD Problem Report #46897
From campbell@mumble.net Mon Sep 3 21:17:44 2012
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Date: Mon, 3 Sep 2012 21:17:36 +0000 (UTC)
From: Taylor R Campbell <campbell+netbsd@mumble.net>
Reply-To: Taylor R Campbell <campbell+netbsd@mumble.net>
To: gnats-bugs@gnats.NetBSD.org
Subject: procfs uses too small a buffer for /proc/cpuinfo (or, I have too many cores)
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>Number: 46897
>Category: kern
>Synopsis: procfs uses too small a buffer for /proc/cpuinfo (or, I have too many cores)
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: closed
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Mon Sep 03 21:20:00 +0000 2012
>Closed-Date: Tue Aug 09 04:06:40 +0000 2016
>Last-Modified: Tue Aug 09 04:06:40 +0000 2016
>Originator: Taylor R Campbell <campbell+netbsd@mumble.net>
>Release: NetBSD 6.99.10
>Organization:
>Environment:
Architecture: amd64
Machine: amd64
>Description:
I mounted procfs on a system with 24 cores (well, 24 threads --
two CPUs, six cores per CPU, two threads per core). I tried to
see what /proc/cpuinfo would say about them, only to find:
# cat /proc/cpuinfo
cat: /proc/cpuinfo: No space left on device
Evidently procfs_docpuinfo allocates an 8 KB buffer for the
whole content of /proc/cpuinfo. Estimating from the output of
`cpuctl identify 0', this buffer would need to be expanded by a
factor of three to fit all my cores.
>How-To-Repeat:
On a system with too many cores and procfs, run
cat /proc/cpuinfo
>Fix:
Yes, please! Perhaps multiply the buffer size by the number of
cores?
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed
State-Changed-By: msaitoh@NetBSD.org
State-Changed-When: Tue, 09 Aug 2016 04:06:40 +0000
State-Changed-Why:
This problem was fixed by christos@ in 2012:
http://mail-index.netbsd.org/source-changes/2014/04/05/msg053806.html
Thanks.
>Unformatted:
(Contact us)
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