WARNING: bad unlock balance detected! - mkfs.ext4/426 is trying to release lock (rcu_read_lock)

From: Naresh Kamboju <naresh.kamboju@linaro.org>
To: linux-stable <stable@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org, rcu@vger.kernel.org,
	lkft-triage@lists.linaro.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sasha Levin <sashal@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Mark Rutland <mark.rutland@arm.com>
Subject: WARNING: bad unlock balance detected! - mkfs.ext4/426 is trying to release lock (rcu_read_lock)
Date: Mon, 7 Dec 2020 11:17:29 +0530	[thread overview]
Message-ID: <CA+G9fYs=nR-d0n8kV4=OWD+v=GR2ufOEWU9S4oG1_fZRxhGouQ@mail.gmail.com> (raw)

While running "mkfs -t ext4" on arm64 juno-r2 device connected with SSD drive
the following kernel warning reported on stable rc 5.9.13-rc1 kernel.

Steps to reproduce:
------------------
# boot arm64 Juno-r2 device with stable-rc 5.9.13-rc1.
# Connect SSD drive
# Format the file system ext4 type
 mkfs -t ext4 <SSD-drive>
# you will notice this warning

Crash log:
--------------
Writing superblocks and filesystem accounting information:   0/895
[   86.131095]
[   86.132592] =====================================
[   86.137300] WARNING: bad unlock balance detected!
[   86.142012] 5.9.13-rc1 #1 Not tainted
[   86.145675] -------------------------------------
[   86.150384] mkfs.ext4/426 is trying to release lock (rcu_read_lock) at:
[   86.157020] [<ffff80001063478c>] blk_queue_exit+0xcc/0x1b0
[   86.162511] but there are no more locks to release!
[   86.167392]
[   86.167392] other info that might help us debug this:
[   86.173929] no locks held by mkfs.ext4/426.
[   86.178114]
[   86.178114] stack backtrace:
[   86.182478] CPU: 1 PID: 426 Comm: mkfs.ext4 Not tainted 5.9.13-rc1 #1
[   86.188926] Hardware name: ARM Juno development board (r2) (DT)
[   86.194853] Call trace:
[   86.197302]  dump_backtrace+0x0/0x1f8
[   86.200967]  show_stack+0x2c/0x38
[   86.204287]  dump_stack+0xec/0x158
[   86.207694]  print_unlock_imbalance_bug+0xec/0xf0
[   86.212404]  lock_release+0x300/0x388
[   86.216070]  blk_queue_exit+0xe0/0x1b0
[   86.219822]  blk_mq_submit_bio+0x250/0xa08
[   86.223922]  submit_bio_noacct+0x468/0x518
[   86.228022]  submit_bio+0x4c/0x230
[   86.231429]  submit_bh_wbc+0x17c/0x218
[   86.235182]  __block_write_full_page+0x210/0x648
[   86.239805]  block_write_full_page+0x8c/0x150
[   86.244167]  blkdev_writepage+0x30/0x40
[   86.248008]  __writepage+0x38/0xd8
[   86.251412]  write_cache_pages+0x1fc/0x590
[   86.255513]  generic_writepages+0x64/0xa0
[   86.259526]  blkdev_writepages+0x28/0x38
[   86.263452]  do_writepages+0x6c/0x138
[   86.267118]  __filemap_fdatawrite_range+0x10c/0x148
[   86.272001]  file_write_and_wait_range+0x6c/0xd0
[   86.276623]  blkdev_fsync+0x3c/0x68
[   86.280113]  vfs_fsync_range+0x4c/0x90
[   86.283864]  do_fsync+0x48/0x78
[   86.287007]  __arm64_sys_fsync+0x24/0x38
[   86.290933]  el0_svc_common.constprop.3+0x7c/0x198
[   86.295729]  do_el0_svc+0x34/0xa0
[   86.299047]  el0_sync_handler+0x16c/0x210
[   86.303060]  el0_sync+0x140/0x180

Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>

Full test log link,
https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-5.9.y/build/v5.9.12-47-g1372e1af58d4/testrun/3538037/suite/linux-log-parser/test/check-kernel-exception-2012808/log

metadata:
  git branch: linux-5.9.y
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
  git commit: 1372e1af58d410676db7917cc3484ca22d471623
  git describe: v5.9.12-47-g1372e1af58d4
  make_kernelversion: 5.9.13-rc1
  kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/juno/lkft/linux-stable-rc-5.9/47/config

-- 
Linaro LKFT
https://lkft.linaro.org