linux-kernel - Re: [PATCH] perf: unwind: fix segbase for libunwind.

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Date:	Wed, 1 Apr 2015 16:48:39 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...nel.org, jolsa@...nel.org, namhyung@...nel.org,
	mingo@...hat.com, lizefan@...wei.com, pi3orama@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: unwind: fix segbase for libunwind.


* Wang Nan <wangnan0@...wei.com> wrote:

> Perf passes incorrect segbase and table_data to libunwind when 
> map->pgoff != 0, causes unwind failure. This patch fixes this 
> problem.
> 
> segbase is an absolute offset from the head of object file, directly 
> read from ELF file. Original code computes corresponding virtual 
> address using map->start + segbase, doesn't consider map->pgoff. 
> Which causes libunwind read from incorrect offset.

What's the effect of this bug in practice?

Is there any before/after output you can show that demonstrates the 
fix?

Thanks,

	Ingo
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