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Date: Thu, 11 Jan 2018 16:38:45 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Vince Weaver <vincent.weaver@...ne.edu> Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7 On Thu, Jan 11, 2018 at 10:26:14AM -0500, Vince Weaver wrote: > On Thu, 11 Jan 2018, Peter Zijlstra wrote: > > > I'm seeing things like: > > > > Cannot open /sys/kernel/tracing/kprobe_events > > > > this is likely caused by me not having anything mounted there. Rostedt > > provided the magic incantation to make that work, I'll go try now. > > The perf_fuzzer krpobe code is possibly really out of date, I haven't > really kept up with recent developments and I don't usually fuzz as root. I was thinking that running as root should be worse than user.. I can switch to fuzzing as user.. who knows. > > At least I seem to have cured all lockdep splats.. of course, the moment > > I hit send on this someone bad is bound to happen. > > Should I be trying any of those patches? Can't hurt, but I doubt it'll help sone, nothing there is PTI specific. The force_early_printk stuff helps with printk deadlocks though, hit a bunch of them earlier today when I build a kernel without them in. > Currently I can still lock my machines pretty quickly. I have been doing > some more tests. Machines don't crash if paranoid is "2" but will if > paranoid is "1". OK, I'm going to try fuzzing as a user with paranoid=0, and if that doesn't help, I'm going to switch to linus' tree with my patches on.
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