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Date:   Wed, 27 Mar 2019 10:28:19 +1100 (AEDT)
From:   Finn Thain <>
To:     syzbot <>
Subject: Re: INFO: rcu detected stall in __perf_sw_event

On Tue, 26 Mar 2019, syzbot wrote:

> syzbot has bisected this bug to:
> commit cf85d89562f39cc7ae73de54639f1915a9195b7a
> Author: Finn Thain <>
> Date:   Fri May 25 07:34:36 2018 +0000
>    m68k/mac: Enable PDMA for PowerBook 500 series

Looks like a false positive. But if you really are running syzkaller on a 
PowerBook 500, you'll want to check that you have an FPU, otherwise a CPU 
erratum will probably mess up your results.


> bisection log:
> start commit:   b0314565 Merge tag 'for_linus' of git://
> git tree:       upstream
> final crash:
> console output:
> kernel config:
> dashboard link:
> syz repro:
> Reported-by:
> Fixes: cf85d89562f3 ("m68k/mac: Enable PDMA for PowerBook 500 series")
> For information about bisection process see:

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