linux-kernel - Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

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Message-ID: <20180109162019.GL3040@hirez.programming.kicks-ass.net>
Date:   Tue, 9 Jan 2018 17:20:19 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Vince Weaver <vincent.weaver@...ne.edu>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

On Tue, Jan 09, 2018 at 05:16:06PM +0100, Ingo Molnar wrote:
> > +	force_early_printk
> > +			Forcefully uses early_console (as per earlyprintk=)
> > +			usage for regular printk, bypassing everything,
> > +			including the syslog (dmesg will be empty).
> 
> BTW., this looks very useful - please consider pushing it upstream if it does not 
> hurt any of the other syslog usecases.

I've posted it a number of times, the printk people didn't hate it but
haven't merged it either. Instead they continue working on making it a
bigger trainwreck...

I'll post it again later when we're not chasing spectres and meltdowns.