linux-kernel - Re: [mainline]Kernel crash while running ftrace selftest

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Message-ID: <20250416150732.131ac838@gandalf.local.home>
Date: Wed, 16 Apr 2025 15:07:32 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>, Hari Bathini <hbathini@...ux.ibm.com>
Subject: Re: [mainline]Kernel crash while running ftrace selftest

On Wed, 16 Apr 2025 22:36:11 +0530
Venkat Rao Bagalkote <venkat88@...ux.ibm.com> wrote:

> > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> > index a8a02868b435..777574fa3095 100644
> > --- a/kernel/trace/ftrace.c
> > +++ b/kernel/trace/ftrace.c
> > @@ -3625,8 +3625,8 @@ static int rebuild_hashes(struct ftrace_hash **filter_hash, struct ftrace_hash *
> >    */
> >   int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
> >   {
> > -	struct ftrace_hash *filter_hash;
> > -	struct ftrace_hash *notrace_hash;
> > +	struct ftrace_hash *filter_hash = EMPTY_HASH;
> > +	struct ftrace_hash *notrace_hash = EMPTY_HASH;
> >   	int ret;
> >   
> >   	if (unlikely(ftrace_disabled))  
> 
> 
> Hello Steve,
> 
> Issue still persists with the above patch.
> 

Damn!

I know you are testing PPC but can you send me your config. I can't
reproduce it on x86, but it could be some tracing options you have enable
or disabled that I don't.

Thanks,

-- Steve