linux-kernel - Re: [BUG] Stack overflow when running perf and function tracer

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Message-ID: <20201030103220.GH2611@hirez.programming.kicks-ass.net>
Date:   Fri, 30 Oct 2020 11:32:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>, kan.liang@...ux.intel.com,
        like.xu@...ux.intel.com
Subject: Re: [BUG] Stack overflow when running perf and function tracer

On Fri, Oct 30, 2020 at 11:26:01AM +0100, Thomas Gleixner wrote:

> > The only thing I can come up with in a hurry is that that dummy_iregs
> > thing really should be static. That's 168 bytes of stack out the window
> > right there.
> 
> What's worse is perf_sample_data which is 384 bytes and is 64 bytes aligned.

Urgh, that thing just keeps on growing :/

I'll try and have a look if we can both shrink the thing and move it off
stack.