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Date:   Sun, 22 Nov 2020 18:36:20 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     0day robot <lkp@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...e.com>,
        Yafang Shao <laoar.shao@...il.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Hui Su <sh_def@....com>, Wei Yang <richard.weiyang@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: [mm/memcg] ade1ab542f: EIP:mem_cgroup_lruvec


Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: ade1ab542fdd4833c6bc9d685a4b4f3bfea83e00 ("mm/memcg: add missed warning in mem_cgroup_lruvec")
url: https://github.com/0day-ci/linux/commits/UPDATE-20201120-183809/Alex-Shi/mm-memcg-add-missed-warning-in-mem_cgroup_lruvec/20201120-173445


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-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+----------------------------------------------------------+-----------+------------+
|                                                          | v5.10-rc4 | ade1ab542f |
+----------------------------------------------------------+-----------+------------+
| boot_successes                                           | 195       | 0          |
| WARNING:at_include/linux/memcontrol.h:#mem_cgroup_lruvec | 0         | 18         |
| EIP:mem_cgroup_lruvec                                    | 0         | 18         |
+----------------------------------------------------------+-----------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>


[   11.506736] WARNING: CPU: 0 PID: 147 at include/linux/memcontrol.h:476 mem_cgroup_lruvec+0x1a/0x39
[   11.506745] Modules linked in:
[   11.509082] ntfs: driver 2.1.32 [Flags: R/W DEBUG].
[   11.510771] 
[   11.510784] CPU: 0 PID: 147 Comm: kswapd0 Not tainted 5.10.0-rc4-00001-gade1ab542fdd #1
[   11.513334] fuse: init (API version 7.32)
[   11.515043] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   11.517040] JFS: nTxBlock = 8192, nTxLock = 65536
[   11.517150] EIP: mem_cgroup_lruvec+0x1a/0x39
[   11.517161] Code: eb 06 8d 44 91 4c 8b 00 85 c0 79 02 31 c0 5d c3 55 89 e5 89 c1 e8 7e ff ff ff 84 c0 74 08 8d 82 54 0b 00 00 eb 19 85 c9 75 08 <0f> 0b 8b 0d 64 84 7b 50 8b 82 50 0a 00 00 8b 84 81 60 07 00 00 39
[   11.521433] EAX: 00000000 EBX: 5078dfe0 ECX: 00000000 EDX: 5078dfe0
[   11.522288] ESI: 00000000 EDI: 00000002 EBP: 41b39f30 ESP: 41b39f30
[   11.523089] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010246
[   11.524480] CR0: 80050033 CR2: 00000000 CR3: 108e1000 CR4: 00000690
[   11.525772] Call Trace:
[   11.526285]  ? prepare_kswapd_sleep+0x59/0x87
[   11.527167]  ? kswapd+0xd7/0x354
[   11.527897]  ? __wake_up_locked_sync_key+0x17/0x17
[   11.528888]  ? kthread+0xea/0xef
[   11.529537]  ? balance_pgdat+0x2df/0x2df
[   11.530343]  ? __list_del_entry+0x1c/0x1c
[   11.531234]  ? ret_from_fork+0x1c/0x30
[   11.532077] irq event stamp: 199
[   11.532751] hardirqs last  enabled at (207): [<4e2803ab>] console_unlock+0x479/0x4bb
[   11.534133] hardirqs last disabled at (214): [<4e28018c>] console_unlock+0x25a/0x4bb
[   11.535480] softirqs last  enabled at (230): [<4f34eb7f>] __do_softirq+0x2ef/0x31f
[   11.536514] softirqs last disabled at (223): [<4e20a975>] call_on_stack+0x40/0x46
[   11.536566] SGI XFS with security attributes, scrub, quota, debug enabled
[   11.537477] random: get_random_bytes called from init_oops_id+0x23/0x3b with crng_init=0
[   11.537487] ---[ end trace cf4f454a846def0a ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.10.0-rc4-00001-gade1ab542fdd .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 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-5.10.0-rc4-00001-gade1ab542fdd" of type "text/plain" (184023 bytes)

View attachment "job-script" of type "text/plain" (4621 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (17944 bytes)

View attachment "locktorture" of type "text/plain" (42 bytes)

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