linux-kernel - Re: perf not capturing stack traces

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150125155651.GB11502@n2100.arm.linux.org.uk>
Date:	Sun, 25 Jan 2015 15:56:52 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Felipe Balbi <balbi@...com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Tony Lindgren <tony@...mide.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: perf not capturing stack traces

On Sat, Jan 24, 2015 at 04:23:42PM -0600, Felipe Balbi wrote:
> yeah, I'll try a few older kernels, also see if I can reproduce on other
> boards.

Perf works for me with CONFIG_FRAME_POINTER=y, but that's only for kernel
space, and for userspace where the programs have been built for ARM mode
with frame pointers.

The kernel may work without CONFIG_FRAME_POINTER set, but I've never
tested that, and I'd suggest that (given my experience looking at oops
dumps) it's not all that reliable.

Lastly, userspace without frame pointers is pretty much hopeless.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/