linux-kernel - Re: [for-next][PATCH 7/7] tracing: Use pr_err() instead of WARN() for memory failures

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Message-ID: <20200126155013.5cfc23aa@rorschach.local.home>
Date:   Sun, 26 Jan 2020 15:50:13 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [for-next][PATCH 7/7] tracing: Use pr_err() instead of WARN()
 for memory failures

On Sun, 26 Jan 2020 12:38:55 -0800
Joe Perches <joe@...ches.com> wrote:

> On Sun, 2020-01-26 at 14:19 -0500, Steven Rostedt wrote:
> > From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> > 
> > As warnings can trigger panics, especially when "panic_on_warn" is set,
> > memory failure warnings can cause panics and fail fuzz testers that are
> > stressing memory.
> > 
> > Create a MEM_FAIL() macro to use instead of WARN() in the tracing code
> > (perhaps this should be a kernel wide macro?), and use that for memory
> > failure issues. This should stop failing fuzz tests due to warnings.  
> 
> It looks as if most of these could just be removed instead
> as there is an existing dump_stack() on failure.

That sounds more generic. This is specific for my own tracing tests to
look for. As the point is, it is *not* to dump_stack, and still report
the error.

-- Steve