linux-kernel - Re: 4.19 dwarf unwinding broken

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Message-ID: <20191003100300.GA22784@krava>
Date:   Thu, 3 Oct 2019 12:03:00 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Josh Hunt <johunt@...mai.com>
Cc:     john@...anate.com, jolsa@...nel.org,
        alexander.shishkin@...ux.intel.com, khlebnikov@...dex-team.ru,
        namhyung@...nel.org, peterz@...radead.org, acme@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: 4.19 dwarf unwinding broken

On Thu, Oct 03, 2019 at 12:54:09AM -0700, Josh Hunt wrote:
> The following commit is breaking dwarf unwinding on 4.19 kernels:

how?

jirka

> 
> commit e5adfc3e7e774ba86f7bb725c6eef5f32df8630e
> Author: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> Date:   Tue Aug 7 12:09:01 2018 +0300
> 
>     perf map: Synthesize maps only for thread group leader
> 
> It looks like this was fixed later by:
> 
> commit e8ba2906f6b9054102ad035ac9cafad9d4168589
> Author: John Keeping <john@...anate.com>
> Date:   Thu Aug 15 11:01:45 2019 +0100
> 
>     perf unwind: Fix libunwind when tid != pid
> 
> but was not selected as a backport to 4.19. Are there plans to backport the
> fix? If not, could we have the breaking commit reverted in 4.19 LTS?
> 
> Thanks
> Josh