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Subject: Re: BUG: soft lockup in ieee80211_tasklet_handler
From:   Johannes Berg <johannes@sipsolutions.net>
To:     Dmitry Vyukov <dvyukov@google.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
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Date:   Thu, 04 Mar 2021 09:30:52 +0100
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On Tue, 2021-03-02 at 20:01 +0100, Dmitry Vyukov wrote:
> 
> Looking at the reproducer that mostly contains just perf_event_open,
> It may be the old known issue of perf_event_open with some extreme
> parameters bringing down kernel.
> +perf maintainers
> And as far as I remember +Peter had some patch to restrict
> perf_event_open parameters.
> 
> r0 = perf_event_open(&(0x7f000001d000)={0x1, 0x70, 0x0, 0x0, 0x0, 0x0,
> 0x0, 0x3ff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffffffe, 0x0, @perf_config_ext}, 0x0,
> 0x0, 0xffffffffffffffff, 0x0)

Oh! Thanks for looking.

Seems that also applies to

https://syzkaller.appspot.com/bug?extid=d6219cf21f26bdfcc22e

FWIW. I was still tracking that one, but never had a chance to look at
it (also way down the list since it was reported as directly in hwsim)

johannes