linux-kernel - Re: Regression on todays tip/master (commit 16f70beccf43)

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Message-ID: <20200724153536.GX27672@8bytes.org>
Date:   Fri, 24 Jul 2020 17:35:37 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: Regression on todays tip/master (commit 16f70beccf43)

On Fri, Jul 24, 2020 at 04:50:53PM +0200, Joerg Roedel wrote:
> Next thing is, I can reliable reproduce it with yesterdays tip/master
> (commit 16f70beccf43), but did not see it with tip/master pulled today
> (commit c02699cd25e8) yet.

Next bisection try ended with this log:

# bad: [16f70beccf43f9eb481ff8485974bc00ab2267d8] Merge branch 'core/debugobjects'
# good: [ba47d845d715a010f7b51f6f89bae32845e6acb7] Linux 5.8-rc6
git bisect start '16f70beccf43' 'v5.8-rc6'
# good: [e9c8c19545f31ec817507ee11884356799f14917] Merge branch 'perf/core'
git bisect good e9c8c19545f31ec817507ee11884356799f14917
# bad: [8e62572d2c29e1c484f5d4e7c016793209de2efb] Merge branch 'linus'
git bisect bad 8e62572d2c29e1c484f5d4e7c016793209de2efb
# good: [c085fb8774671e83f6199a8e838fbc0e57094029] perf/x86/intel/lbr: Support XSAVES for arch LBR read
git bisect good c085fb8774671e83f6199a8e838fbc0e57094029
# good: [220dbf4aaa5b574f67ce23fa4d7b0104515bc60e] Merge branch 'WIP.core/headers'
git bisect good 220dbf4aaa5b574f67ce23fa4d7b0104515bc60e
# bad: [9d246053a69196c7c27068870e9b4b66ac536f68] sched: Add a tracepoint to track rq->nr_running
git bisect bad 9d246053a69196c7c27068870e9b4b66ac536f68
# bad: [46609ce227039fd192e0ecc7d940bed587fd2c78] sched/uclamp: Protect uclamp fast path code with static key
git bisect bad 46609ce227039fd192e0ecc7d940bed587fd2c78
# bad: [85c2ce9104eb93517db2037699471c517e81f9b4] sched, vmlinux.lds: Increase STRUCT_ALIGNMENT to 64 bytes for GCC-4.9
git bisect bad 85c2ce9104eb93517db2037699471c517e81f9b4
# bad: [faa2fd7cbad4609d06d7904c0a80cf2f8cd23678] Merge branch 'sched/urgent'
git bisect bad faa2fd7cbad4609d06d7904c0a80cf2f8cd23678
# first bad commit: [faa2fd7cbad4609d06d7904c0a80cf2f8cd23678] Merge branch 'sched/urgent'

So it ends at a merge commit. I am not going to debug this further as it
is no longer reproducible with todays tip/master. It probably was just a
bug in a conflict resolution when merging branches or something like
that.

Regards,

	Joerg