From: Milian Wolff <milian.wolff@kdab.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: perf trace: Problems initializing symbol libraries!
Date: Mon, 16 May 2016 13:31:48 +0200 [thread overview]
Message-ID: <1849423.FYp0BrzLMo@agathebauer> (raw)
In-Reply-To: <20160512181044.GK20258@kernel.org>
[-- Attachment #1: Type: text/plain, Size: 1435 bytes --]
On Donnerstag, 12. Mai 2016 15:10:44 CEST Arnaldo Carvalho de Melo wrote:
> Em Thu, May 12, 2016 at 02:05:35PM +0200, Milian Wolff escreveu:
> > I'm getting the following error when trying to run `perf trace` built from
> > acme's perf/core branch on an Ubuntu 16.04 machine:
> >
> > $ perf trace
> > Problems initializing symbol libraries!
> >
> > strace shows this at the end:
> >
> > ...
> > lstat("/proc", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
> > lstat("/proc/kallsyms", {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> > write(2, "Problems initializing symbol lib"..., 40Problems initializing
> > symbol libraries!
> > ) = 40
> > exit_group(244)
> >
> > Is something wrong with my /proc/kallsyms? Can someone tell me what the
> > problems are that are being encountered?
>
> Does it work as root?
It does work as root. Note that on my other machines, I can run these commands
to make it work as a non-root user:
sudo mount -o remount,mode=755 /sys/kernel/debug
sudo mount -o remount,mode=755 /sys/kernel/debug/tracing
echo "-1" | sudo tee /proc/sys/kernel/perf_event_paranoid
This does not work on Ubuntu 16.04 anymore.
>
> What is the value of /proc/sys/kernel/kptr_restrict?
>
This file does not exist.
> Need to improve that message :-\
Yes please :)
--
Milian Wolff | milian.wolff@kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
[-- Attachment #2: smime.p7s --]
[-- Type: application/pkcs7-signature, Size: 5903 bytes --]
next prev parent reply other threads:[~2016-05-16 11:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-12 12:05 perf trace: Problems initializing symbol libraries! Milian Wolff
2016-05-12 18:10 ` Arnaldo Carvalho de Melo
2016-05-16 11:31 ` Milian Wolff [this message]
2016-05-16 13:15 ` Arnaldo Carvalho de Melo
2016-05-16 20:13 ` Arnaldo Carvalho de Melo
2016-05-17 7:51 ` Milian Wolff
2016-05-17 15:06 ` Arnaldo Carvalho de Melo
2016-05-23 10:05 ` Milian Wolff
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1849423.FYp0BrzLMo@agathebauer \
--to=milian.wolff@kdab.com \
--cc=acme@kernel.org \
--cc=linux-perf-users@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.