linux-kernel - 4.19 dwarf unwinding broken

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Message-ID: <ab87d20b-526c-9435-0532-c298beeb0318@akamai.com>
Date:   Thu, 3 Oct 2019 00:54:09 -0700
From:   Josh Hunt <johunt@...mai.com>
To:     john@...anate.com, jolsa@...nel.org,
        alexander.shishkin@...ux.intel.com, khlebnikov@...dex-team.ru,
        namhyung@...nel.org, peterz@...radead.org, acme@...hat.com
Cc:     linux-kernel@...r.kernel.org
Subject: 4.19 dwarf unwinding broken

The following commit is breaking dwarf unwinding on 4.19 kernels:

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