linux-kernel - [sched] 3cf68f7aae: WARNING:at_kernel/rcu/update.c:#rcutorture_sched

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Date:   Mon, 26 Sep 2022 10:51:32 +0800
From:   kernel test robot <yujie.liu@...el.com>
To:     Waiman Long <longman@...hat.com>
CC:     <lkp@...ts.01.org>, <lkp@...el.com>,
        <linux-kernel@...r.kernel.org>, "Ingo Molnar" <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "Valentin Schneider" <vschneid@...hat.com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Will Deacon <will@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Lai Jiangshan" <jiangshanlai@...il.com>,
        Waiman Long <longman@...hat.com>
Subject: [sched] 3cf68f7aae:
 WARNING:at_kernel/rcu/update.c:#rcutorture_sched_setaffinity

Hi Waiman,

While this report is for v9 patch, we found that the issue also happens
on v10 patch, so we send this report FYI. Thanks.

Greeting,

FYI, we noticed the following commit (built with gcc-11):

commit: 3cf68f7aaecb7f1482f3183a5925641632658667 ("[PATCH v9 2/7] sched: Use user_cpus_ptr for saving user provided cpumask in sched_setaffinity()")
url: https://github.com/intel-lab-lkp/linux/commits/Waiman-Long/sched-Persistent-user-requested-affinity/20220917-023345
base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 6879c2d3b96039ff1668b4328a4d0dd3ea952cff
patch link: https://lore.kernel.org/lkml/20220916183217.1172225-3-longman@redhat.com

in testcase: rcutorture
version: 
with following parameters:

	runtime: 300s
	test: cpuhotplug
	torture_type: trivial

test-description: rcutorture is rcutorture kernel module load/unload test.
test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


[   95.904059][  T543] ------------[ cut here ]------------
[   95.904506][  T543] rcutorture_sched_setaffinity: sched_setaffinity() returned -22
[   95.905105][  T543] WARNING: CPU: 0 PID: 543 at kernel/rcu/update.c:495 rcutorture_sched_setaffinity+0x45/0x50
[   95.905843][  T543] Modules linked in: rcutorture torture
[   95.906279][  T543] CPU: 0 PID: 543 Comm: rcu_torture_fak Tainted: G        W          6.0.0-rc5-00091-g3cf68f7aaecb #1
[   95.907111][  T543] EIP: rcutorture_sched_setaffinity+0x45/0x50
[   95.907640][  T543] Code: 94 d0 82 00 75 ee 89 44 24 08 b9 88 5e f9 81 b2 01 89 4c 24 04 c7 04 24 00 d9 5f 82 88 15 8a 94 d0 82 89 45 fc e8 db 4d dc 00 <0f> 0b 8b 45 fc 89 ec 5d c3 66 90 55 31 c0 80 3d dc 65 65 83 00 89
[   95.909113][  T543] EAX: 0000003e EBX: 00000000 ECX: e756ff14 EDX: 00001794
[   95.909666][  T543] ESI: ee381d00 EDI: 00000002 EBP: ed37ff44 ESP: ed37ff34
[   95.910203][  T543] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010282
[   95.910816][  T543] CR0: 80050033 CR2: 77d40bb0 CR3: 06a9a000 CR4: 000406b0
[   95.911357][  T543] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   95.911895][  T543] DR6: fffe0ff0 DR7: 00000400
[   95.912255][  T543] Call Trace:
[   95.912529][  T543]  synchronize_rcu_trivial+0x57/0xf0 [rcutorture]
[   95.913034][  T543]  rcu_torture_fakewriter+0x108/0x280 [rcutorture]
[   95.913532][  T543]  kthread+0xcd/0xf0
[   95.913839][  T543]  ? rcu_read_unlock+0x60/0x60 [rcutorture]
[   95.914311][  T543]  ? kthread_complete_and_exit+0x20/0x20
[   95.914734][  T543]  ret_from_fork+0x19/0x24
[   95.915065][  T543] irq event stamp: 66091
[   95.915386][  T543] hardirqs last  enabled at (66099): [<810d5f79>] __up_console_sem+0x69/0x80
[   95.916046][  T543] hardirqs last disabled at (66106): [<810d5f5d>] __up_console_sem+0x4d/0x80
[   95.916711][  T543] softirqs last  enabled at (66072): [<81f8e014>] __do_softirq+0x284/0x4a3
[   95.917377][  T543] softirqs last disabled at (66063): [<8100b544>] do_softirq_own_stack+0x24/0x30
[   95.918043][  T543] ---[ end trace 0000000000000000 ]---


If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <yujie.liu@...el.com>
| Link: https://lore.kernel.org/r/202209260935.35aecc5a-yujie.liu@intel.com


To reproduce:

        # build kernel
	cd linux
	cp config-6.0.0-rc5-00091-g3cf68f7aaecb .config
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-11 CC=gcc-11 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

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.


-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

View attachment "config-6.0.0-rc5-00091-g3cf68f7aaecb" of type "text/plain" (146845 bytes)

View attachment "job-script" of type "text/plain" (5396 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (87844 bytes)

View attachment "rcutorture" of type "text/plain" (10299 bytes)