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Date: Fri, 12 Feb 2021 14:54:46 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Yang Shi <shy828301@...il.com>
Cc: 0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
lkp@...ts.01.org, guro@...com, ktkhai@...tuozzo.com,
vbabka@...e.cz, shakeelb@...gle.com, david@...morbit.com,
hannes@...xchg.org, mhocko@...e.com, akpm@...ux-foundation.org,
shy828301@...il.com, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org
Subject: [mm] bd741fb2ad: WARNING:suspicious_RCU_usage
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: bd741fb2adf349f6bf931e43331b45ef828e1da4 ("mm: vmscan: add shrinker_info_protected() helper")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git Yang-Shi/Make-shrinker-s-nr_deferred-memcg-aware/20210210-020209
in testcase: locktorture
version:
with following parameters:
runtime: 300s
test: default
test-description: This torture test consists of creating a number of kernel threads which acquire the lock and hold it for specific amount of time, thus simulating different critical region behaviors.
test-url: https://www.kernel.org/doc/Documentation/locking/locktorture.txt
on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+----------------------------------------------------------+------------+------------+
| | b4182da22d | bd741fb2ad |
+----------------------------------------------------------+------------+------------+
| boot_successes | 25 | 0 |
| boot_failures | 3 | 28 |
| WARNING:kernel_stack | 2 | 2 |
| RIP:clear_page_rep | 1 | |
| WARNING:suspicious_RCU_usage | 0 | 28 |
| mm/vmscan.c:#suspicious_rcu_dereference_protected()usage | 0 | 28 |
+----------------------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 131.472262] WARNING: suspicious RCU usage
[ 131.473301] 5.11.0-rc4-next-20210125-00006-gbd741fb2adf3 #1 Not tainted
[ 131.475075] -----------------------------
[ 131.475925] mm/vmscan.c:196 suspicious rcu_dereference_protected() usage!
[ 131.477392]
[ 131.477392] other info that might help us debug this:
[ 131.477392]
[ 131.479707]
[ 131.479707] rcu_scheduler_active = 2, debug_locks = 1
[ 131.481293] 2 locks held by kworker/1:2/96:
[ 131.482137] #0: ffff888100b74d38 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at: process_one_work (kbuild/src/consumer/kernel/workqueue.c:2250)
[ 131.484496] #1: ffffc900001b7de0 ((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at: process_one_work (kbuild/src/consumer/kernel/workqueue.c:2251)
[ 131.487459]
[ 131.487459] stack backtrace:
[ 131.488491] CPU: 1 PID: 96 Comm: kworker/1:2 Not tainted 5.11.0-rc4-next-20210125-00006-gbd741fb2adf3 #1
[ 131.490642] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 131.492332] Workqueue: cgroup_destroy css_free_rwork_fn
[ 131.493425] Call Trace:
[ 131.494300] dump_stack (kbuild/src/consumer/lib/dump_stack.c:122)
[ 131.495555] lockdep_rcu_suspicious (kbuild/src/consumer/kernel/locking/lockdep.c:6428)
[ 131.496543] shrinker_info_protected (kbuild/src/consumer/mm/vmscan.c:196 (discriminator 7))
[ 131.497622] free_shrinker_info (kbuild/src/consumer/mm/vmscan.c:243 kbuild/src/consumer/mm/vmscan.c:232)
[ 131.498440] mem_cgroup_css_free (kbuild/src/consumer/mm/memcontrol.c:3650 kbuild/src/consumer/mm/memcontrol.c:5325)
[ 131.499407] css_free_rwork_fn (kbuild/src/consumer/include/linux/spinlock.h:359 kbuild/src/consumer/kernel/cgroup/cgroup.c:319 kbuild/src/consumer/kernel/cgroup/cgroup.c:4916)
[ 131.500291] process_one_work (kbuild/src/consumer/kernel/workqueue.c:2280)
[ 131.501441] ? pwq_dec_nr_in_flight (kbuild/src/consumer/kernel/workqueue.c:2171)
[ 131.502342] ? __kasan_check_write (kbuild/src/consumer/mm/kasan/shadow.c:38)
[ 131.503206] ? worker_clr_flags (kbuild/src/consumer/arch/x86/include/asm/atomic.h:95 kbuild/src/consumer/include/asm-generic/atomic-instrumented.h:241 kbuild/src/consumer/kernel/workqueue.c:989)
[ 131.507718] worker_thread (kbuild/src/consumer/include/linux/list.h:282 kbuild/src/consumer/kernel/workqueue.c:2422)
[ 131.508516] ? __kasan_check_read (kbuild/src/consumer/mm/kasan/shadow.c:32)
[ 131.509409] kthread (kbuild/src/consumer/kernel/kthread.c:292)
[ 131.510107] ? process_scheduled_works (kbuild/src/consumer/kernel/workqueue.c:2364)
[ 131.511132] ? kthread_unpark (kbuild/src/consumer/kernel/kthread.c:245)
[ 131.511923] ret_from_fork (kbuild/src/consumer/arch/x86/entry/entry_64.S:302)
[ OK ] Started Load Kernel Modules.
[ OK ] Mounted Huge Pages File System.
Starting Apply Kernel Variables...
Mounting FUSE Control File System...
Starting Load/Save Random Seed...
Starting Create System Users...
[ OK ] Started Apply Kernel Variables.
[ OK ] Mounted FUSE Control File System.
[ OK ] Started Load/Save Random Seed.
[ OK ] Started Create System Users.
Starting Create Static Device Nodes in /dev...
[ OK ] Started Journal Service.
Starting Flush Journal to Persistent Storage...
[ OK ] Started Create Static Device Nodes in /dev.
Starting udev Kernel Device Manager...
[ OK ] Reached target Local File Systems (Pre).
[ OK ] Reached target Local File Systems.
Starting Preprocess NFS configuration...
[ OK ] Started Flush Journal to Persistent Storage.
[ OK ] Started udev Kernel Device Manager.
[ OK ] Started Preprocess NFS configuration.
[ OK ] Reached target NFS client services.
Starting Create Volatile Files and Directories...
[ OK ] Started Create Volatile Files and Directories.
Starting RPC bind portmap service...
Starting Network Time Synchronization...
Starting Update UTMP about System Boot/Shutdown...
[ OK ] Started RPC bind portmap service.
[ OK ] Reached target RPC Port Mapper.
[ OK ] Reached target Remote File Systems (Pre).
[ OK ] Reached target Remote File Systems.
[ OK ] Started Update UTMP about System Boot/Shutdown.
[ OK ] Started Network Time Synchronization.
[ OK ] Reached target System Time Synchronized.
[* ] A start job is running for udev Coldplug all Devices (21s / no limit)
[ 157.124407] random: fast init done
[ OK ] Reached target System Initialization.
[ OK ] Started Daily apt download activities.
[ OK ] Started Daily rotation of log files.
[ OK ] Listening on D-Bus System Message Bus Socket.
[ OK ] Reached target Sockets.
[ OK ] Reached target Basic System.
Starting System Logging Service...
Starting LSB: OpenIPMI Driver init script...
[ OK ] Started Daily apt upgrade and clean activities.
[ OK ] Started Daily Cleanup of Temporary Directories.
[ OK ] Reached target Timers.
[ OK ] Started D-Bus System Message Bus.
[ OK ] Started Regular background program processing daemon.
Starting Login Service...
[ OK ] Started System Logging Service.
[ OK ] Started Helper to synchronize boot up for ifupdown.
Starting Raise network interfaces...
[ OK ] Started Login Service.
Starting LSB: Load kernel image with kexec...
[ OK ] Started Raise network interfaces.
[FAILED] Failed to start LSB: OpenIPMI Driver init script.
See 'systemctl status openipmi.service' for details.
[ OK ] Reached target Network.
Starting Permit User Sessions...
Starting LKP bootstrap...
Starting /etc/rc.local Compatibility...
Starting OpenBSD Secure Shell server...
[ OK ] Started LSB: Load kernel image with kexec.
[ OK ] Started Permit User Sessions.
[ OK ] Started LKP bootstrap.
[ 175.007810] random: crng init done
To reproduce:
# build kernel
cd linux
cp config-5.11.0-rc4-next-20210125-00006-gbd741fb2adf3 .config
make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
cd <mod-install-dir>
find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
Thanks,
Oliver Sang
View attachment "config-5.11.0-rc4-next-20210125-00006-gbd741fb2adf3" of type "text/plain" (132453 bytes)
View attachment "job-script" of type "text/plain" (4731 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (15992 bytes)
View attachment "locktorture" of type "text/plain" (1238 bytes)
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