linux-kernel - Re: [paulmckrcu:dev.2024.12.11a] [rcutorture] 774c4d7adb: WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend

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Message-ID: <Z2tgdA4mNLxP0z0r@xsang-OptiPlex-9020>
Date: Wed, 25 Dec 2024 09:31:32 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: "Paul E. McKenney" <paulmck@...nel.org>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Frederic Weisbecker
	<frederic@...nel.org>, <rcu@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<oliver.sang@...el.com>
Subject: Re: [paulmckrcu:dev.2024.12.11a] [rcutorture] 774c4d7adb:
 WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture]

hi, Paul,

On Tue, Dec 24, 2024 at 09:57:16AM -0800, Paul E. McKenney wrote:
> On Tue, Dec 24, 2024 at 02:48:26PM +0800, kernel test robot wrote:
> > 
> > hi, Paul,
> > 
> > we noticed there is similar commit in newer branches:
> >   dev.2024.12.11b
> >   dev.2024.12.12a
> >   dev.2024.12.13a
> > 
> > if this is out-of-date version, please just ignore.
> > 
> > the new config is enabled in our tests.
> > ==================== PARENT FIRST_BAD KCONFIGS bb02a67f70d8d58c675403f1f716cf5885967918 ====================
> > --- /pkg/linux/i386-randconfig-001-20241220/clang-19/bb02a67f70d8d58c675403f1f716cf5885967918/.config   2024-12-23 12:46:05.807021581 +0800
> > +++ /pkg/linux/i386-randconfig-001-20241220/clang-19/774c4d7adb4f9134aa265c5fee4e8b07d98c53cb/.config   2024-12-23 14:26:59.938500419 +0800
> > @@ -5864,6 +5864,7 @@ CONFIG_PROVE_RCU=y
> >  CONFIG_TORTURE_TEST=m
> >  CONFIG_RCU_SCALE_TEST=m
> >  CONFIG_RCU_TORTURE_TEST=m
> > +CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=m
> >  # CONFIG_RCU_TORTURE_TEST_LOG_CPU is not set
> >  CONFIG_RCU_REF_SCALE_TEST=m
> >  CONFIG_RCU_CPU_STALL_TIMEOUT=21
> > 
> > 
> > and since the WARN added in this commit is hit, we just make below report FYI.
> 
> This one is a bug that has since been fixed.  The condition:
> 
> 	cur_ops->readlock_nesting() > 0
> 
> Now reads:
> 
> 	cur_ops->readlock_nesting() == 0
> 
> The updated commit is:
> 
> 14f8cc687ce6 ("rcutorture: Make rcutorture_one_extend() check reader state")
> 
> However, your Kconfig above does in fact show a bug.  It is supposed
> to be bool rather than tristate.  I will fix with your Reported-by.

thanks a lot for information! always our great pleasure that our report is
helpful :)


> 
> 							Thanx, Paul