linux-kernel - Re: possible trace_printk() bug in v5.19-rc1

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Date:   Mon, 27 Jun 2022 23:59:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Chuck Lever III <chuck.lever@...cle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: possible trace_printk() bug in v5.19-rc1

On Fri, 24 Jun 2022 19:08:19 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 20 Jun 2022 00:57:23 +0000
> Chuck Lever III <chuck.lever@...cle.com> wrote:
> 
> > > Yes, I'm sure. I just checked out v5.18 and built it with the
> > > same CONFIG. trace_printk() on that kernel generates function
> > > names as expected.    
> > 
> > I moved my development work to another system, and bisected. The
> > result:
> > 
> > 91fb02f31505 ("module: Move kallsyms support into a separate file")  
> 
> Hmm, right below that it says:
> 
>    "No functional change."
> 
> I'm guessing it may not be as reliably reproducible.

I take this back. I bisected it down to this commit as well.

I found another patch in that series that has a function change, so I do
not trust this. This most definitely has a functional change, as the output
of kallsyms changes with it. I'll report it against that patch submission.

-- Steve


> 
> And is this an issue with trace-cmd output or reading the trace file?