linux-kernel - Re: [paulmckrcu:dev.2024.11.01a] [rcutorture] 622baf5d79: WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend

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Message-ID: <ZyxeC9WVcbdTAu0x@xsang-OptiPlex-9020>
Date: Thu, 7 Nov 2024 14:28:27 +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>, <linux-kernel@...r.kernel.org>,
	<oliver.sang@...el.com>
Subject: Re: [paulmckrcu:dev.2024.11.01a] [rcutorture] 622baf5d79:
 WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture]

hi, Paul,

On Wed, Nov 06, 2024 at 12:07:37PM -0800, Paul E. McKenney wrote:
> On Tue, Nov 05, 2024 at 01:00:53PM +0800, kernel test robot wrote:
> > 
> > 
> > Hello,
> > 
> > kernel test robot noticed "WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture]" on:
> > 
> > commit: 622baf5d79169496973d50fc43636469e6af02b7 ("rcutorture: Make rcutorture_one_extend() check reader state")
> > https://github.com/paulmckrcu/linux dev.2024.11.01a
> 
> This is an old commit that failed to handle any torture_type other than
> "rcu", including the "srcu" that you tested with.  It has since been
> replaced by a series of newer commits fixing this and other bugs, with
> the current version here:
> 
> c815d319a933 ("rcutorture: Make rcutorture_one_extend() check reader state")
> 
> Does this one work for you?

yes, this one works. issue gone when we run same test case up to 20 times.

d5e74d8e46e8e45c 622baf5d79169496973d50fc436 c815d319a9331530032be3df69c
---------------- --------------------------- ---------------------------
       fail:runs  %reproduction    fail:runs  %reproduction    fail:runs
           |             |             |             |             |
           :6          100%           6:6            0%            :20    dmesg.EIP:rcutorture_one_extend_check
           :6          100%           6:6            0%            :20    dmesg.WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture]

thanks!

> 
> Either way, thank you for your testing efforts!
> 
> 							Thanx, Paul
>