From: "Paul E. McKenney" <paulmck@kernel.org>
To: Sachin Sant <sachinp@linux.ibm.com>
Cc: Zqiang <qiang1.zhang@intel.com>,
linux-next@vger.kernel.org,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [next-20230322] Kernel WARN at kernel/workqueue.c:3182 (rcutorture)
Date: Thu, 23 Mar 2023 11:34:23 -0700 [thread overview]
Message-ID: <ae015179-03b5-4e4b-86dd-cbab75230c7f@paulmck-laptop> (raw)
In-Reply-To: <233B28DA-70DD-4AD8-9C72-1FFCA6EFE56D@linux.ibm.com>
On Thu, Mar 23, 2023 at 11:00:59PM +0530, Sachin Sant wrote:
>
> >> [ 3629.243407] NIP [00007fff8cd39558] 0x7fff8cd39558
> >> [ 3629.243410] LR [000000010d800398] 0x10d800398
> >> [ 3629.243413] --- interrupt: c00
> >> [ 3629.243415] Code: 419dffa4 e93a0078 39400001 552907be 2f890000 7d20579e 0b090000 e95a0078 e91a0080 39200001 7fa85000 7d204f9e <0b090000> 7f23cb78 4bfffd65 0b030000
> >> [ 3629.243430] ---[ end trace 0000000000000000 ]—
> >>
> >> These warnings are repeated few times. The LTP test is marked as PASS.
> >>
> >> Git bisect point to the following patch
> >> commit f46a5170e6e7d5f836f2199fe82cdb0b4363427f
> >> srcu: Use static init for statically allocated in-module srcu_struct
> >
> > Hello, Sachin, and it looks like you hit something that Zqiang and I
> > have been tracking down. I am guessing that you were using modprobe
> > and rmmod to make this happen, and that this happened at rmmod time.
> >
> Yes, the LTP test script rcu_torture.sh relies on modprobe to load/unload
> the rcutorture module.
>
> > Whatever the reproducer, does the following patch help?
>
> Thank you for the patch. Yes, with this patch applied, the test completes
> successfully without the reported warning.
Very good, thank you! May we have your Tested-by?
Thanx, Paul
next prev parent reply other threads:[~2023-03-23 18:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-23 11:25 [next-20230322] Kernel WARN at kernel/workqueue.c:3182 (rcutorture) Sachin Sant
2023-03-23 14:02 ` Paul E. McKenney
2023-03-23 17:30 ` Sachin Sant
2023-03-23 18:34 ` Paul E. McKenney [this message]
2023-03-24 3:17 ` Sachin Sant
2023-03-24 3:32 ` Paul E. McKenney
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