linux-kernel - Re: [RFC][PATCH v2 20/31] timers: usb: Use del_timer

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Date:   Sat, 29 Oct 2022 07:52:41 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Bhuvanesh Surachari <Bhuvanesh_Surachari@...tor.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-usb@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        John Stultz <jstultz@...gle.com>
Subject: Re: [RFC][PATCH v2 20/31] timers: usb: Use del_timer_shutdown()
 before freeing timer

On Fri, Oct 28, 2022 at 01:00:02PM -0700, Guenter Roeck wrote:
> On Fri, Oct 28, 2022 at 02:10:07PM -0400, Steven Rostedt wrote:
> > On Fri, 28 Oct 2022 14:01:29 -0400
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > @@ -813,6 +839,14 @@ void destroy_timer_on_stack(struct timer_list *timer)
> > >  }
> > >  EXPORT_SYMBOL_GPL(destroy_timer_on_stack);
> > >  
> > > +static struct timer_base *lock_timer_base(struct timer_list *timer,
> > > +					  unsigned long *flags);
> > > +
> > > +void __timer_reinit_debug_objects(struct timer_list *timer)
> > > +{
> > > +	return;
> > > +}
> > > +
> > >  #else
> > >  static inline void debug_timer_init(struct timer_list *timer) { }
> > >  static inline void debug_timer_activate(struct timer_list *timer) { }
> > 
> > Bah, the above chunk was leftover from some debugging.
> > 
> 
> I'll test again with the following changes on top of your published
> patch series. I hope this is the current status, but I may have lost
> something.
> 

With the diffs I sent earlier applied, the warning still seen is

WARNING: CPU: 0 PID: 9 at lib/debugobjects.c:502 debug_print_object+0xd0/0x100
ODEBUG: free active (active state 0) object type: timer_list hint: neigh_timer_handler+0x0/0x480

That happens with almost every test, so I may have missed some others
in the noise.

Guenter