Received-SPF: pass (google.com: domain of linux-kernel+bounces-132490-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1;
From: tada keisuke <keisuke1.tada@kioxia.com>
To: kernel test robot <oliver.sang@intel.com>
CC: "oe-lkp@lists.linux.dev" <oe-lkp@lists.linux.dev>,
        "lkp@intel.com"
	<lkp@intel.com>,
        ohtake toshifumi <toshifumi.ootake@kioxia.com>,
        "linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>,
        "song@kernel.org"
	<song@kernel.org>,
        "yukuai3@huawei.com" <yukuai3@huawei.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 09/11] md: add atomic mode switching when removing disk
Thread-Topic: [PATCH 09/11] md: add atomic mode switching when removing disk
Thread-Index: AQHagv7ppOhMD1h+V0G2IfGpZUQoObFZG7ZQ
Date: Fri, 5 Apr 2024 05:18:04 +0000
Message-ID: <bdffa39d605c4340910640d10ac6a9b4@kioxia.com>
References: <e95e7cea71d1465496a9502b4de49e75@kioxia.com>
 <202403310746.6c8b0587-oliver.sang@intel.com>
In-Reply-To: <202403310746.6c8b0587-oliver.sang@intel.com>
Accept-Language: ja-JP, en-US
Content-Language: ja-JP
Content-Type: text/plain; charset="iso-2022-jp"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk
MIME-Version: 1.0
X-CrossPremisesHeadersFilteredBySendConnector: CNN1EXMB03.r1.kioxia.com
X-OrganizationHeadersPreserved: CNN1EXMB03.r1.kioxia.com

> kern  :err   : [  118.926307] BUG: sleeping function called from invalid =
context at lib/percpu-refcount.c:331
> kern  :err   : [  118.935427] in_atomic(): 0, irqs_disabled(): 0, non_blo=
ck: 0, pid: 55, name: kworker/6:0
> kern  :err   : [  118.944338] preempt_count: 0, expected: 0
> kern  :err   : [  118.949122] RCU nest depth: 1, expected: 0
> kern  :warn  : [  118.954016] CPU: 6 PID: 55 Comm: kworker/6:0 Tainted: G=
 S
> 6.8.0-rc3-00236-gff944d1be0fa #1
> kern  :warn  : [  118.964389] Hardware name: Gigabyte Technology Co., Ltd=
 Z97X-UD5H/Z97X-UD5H, BIOS F9
> 04/21/2015
> kern  :warn  : [  118.973916] Workqueue: md_misc md_start_sync
> kern  :warn  : [  118.978937] Call Trace:
> kern  :warn  : [  118.982115]  <TASK>
> kern :warn : [  118.984943] dump_stack_lvl (lib/dump_stack.c:107 (discrim=
inator 1))
> kern :warn : [  118.989337] __might_resched (kernel/sched/core.c:10190)
> kern :warn : [  118.993989] ? _raw_spin_lock_irqsave (arch/x86/include/as=
m/atomic.h:115
> include/linux/atomic/atomic-arch-fallback.h:2164 include/linux/atomic/ato=
mic-instrumented.h:1296
> include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/=
linux/spinlock_api_smp.h:111
> kernel/locking/spinlock.c:162)
> kern :warn : [  118.999243] ? preempt_notifier_dec (kernel/sched/core.c:1=
0144)
> kern :warn : [  119.004321] percpu_ref_switch_to_atomic_sync (include/lin=
ux/kernel.h:107 lib/percpu-refcount.c:331)
> kern :warn : [  119.010353] ? percpu_ref_reinit (lib/percpu-refcount.c:32=
9)
> kern :warn : [  119.015351] ? _raw_spin_lock_irqsave (arch/x86/include/as=
m/atomic.h:115
> include/linux/atomic/atomic-arch-fallback.h:2164 include/linux/atomic/ato=
mic-instrumented.h:1296
> include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/=
linux/spinlock_api_smp.h:111
> kernel/locking/spinlock.c:162)
> kern :warn : [  119.020596] ? _raw_read_unlock_irqrestore (kernel/locking=
/spinlock.c:161)
> kern :warn : [  119.026282] ? finish_task_switch+0x158/0x730
> kern :warn : [  119.031969] ? __switch_to (arch/x86/include/asm/bitops.h:=
55
> include/asm-generic/bitops/instrumented-atomic.h:29 include/linux/thread_=
info.h:89
> arch/x86/include/asm/fpu/sched.h:66 arch/x86/kernel/process_64.c:626)
> kern :warn : [  119.036435] rdev_removeable (drivers/md/md.c:9282)
> kern :warn : [  119.041083] md_start_sync (drivers/md/md.c:9339 drivers/m=
d/md.c:9449)
> kern :warn : [  119.045462] ? mddev_unlock (drivers/md/md.c:9444)
> kern :warn : [  119.050021] ? _raw_spin_lock_irq (arch/x86/include/asm/at=
omic.h:115
> include/linux/atomic/atomic-arch-fallback.h:2164 include/linux/atomic/ato=
mic-instrumented.h:1296
> include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/=
linux/spinlock_api_smp.h:120
> kernel/locking/spinlock.c:170)
> kern :warn : [  119.054928] ? _raw_spin_lock_bh (kernel/locking/spinlock.=
c:169)
> kern :warn : [  119.059739] process_one_work (kernel/workqueue.c:2638)
> kern :warn : [  119.064476] worker_thread (kernel/workqueue.c:2700 kernel=
/workqueue.c:2787)
> kern :warn : [  119.068943] ? process_one_work (kernel/workqueue.c:2733)
> kern :warn : [  119.073864] kthread (kernel/kthread.c:388)
> kern :warn : [  119.077815] ? kthread_complete_and_exit (kernel/kthread.c=
:341)
> kern :warn : [  119.083321] ret_from_fork (arch/x86/kernel/process.c:153)
> kern :warn : [  119.087627] ? kthread_complete_and_exit (kernel/kthread.c=
:341)
> kern :warn : [  119.093140] ret_from_fork_asm (arch/x86/entry/entry_64.S:=
250)
> kern  :warn  : [  119.097786]  </TASK>

Thanks for reporting.
I need to execute percpu_ref_switch_to_atomic_sync() when RCU is unlocked.
I will fix this problem and submit v2.

Thanks,
Keisuke