linux-kernel - [sched/fair] 88d13f778f: WARNING:at_kernel/sched/fair.c:#place

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Date:   Fri, 21 Aug 2020 08:37:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiang Biao <benbjiang@...il.com>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        linux-kernel@...r.kernel.org, Jiang Biao <benbjiang@...cent.com>,
        0day robot <lkp@...el.com>, lkp@...ts.01.org,
        aubrey.li@...ux.intel.com, yu.c.chen@...el.com
Subject: [sched/fair] 88d13f778f: WARNING:at_kernel/sched/fair.c:#place_entity

Greeting,

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

commit: 88d13f778f3a28132b50a0d698a559de695e8a66 ("[PATCH] sched/fair: avoid vruntime compensation for SCHED_IDLE task")
url: https://github.com/0day-ci/linux/commits/Jiang-Biao/sched-fair-avoid-vruntime-compensation-for-SCHED_IDLE-task/20200820-200323
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 5f4a1c4ea44728aa80be21dbf3a0469b5ca81d88

in testcase: boot

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):


+----------------------------------------------+------------+------------+
|                                              | 5f4a1c4ea4 | 88d13f778f |
+----------------------------------------------+------------+------------+
| boot_successes                               | 9          | 0          |
| boot_failures                                | 0          | 4          |
| WARNING:at_kernel/sched/fair.c:#place_entity | 0          | 4          |
| RIP:place_entity                             | 0          | 4          |
+----------------------------------------------+------------+------------+


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


[    9.183115] WARNING: CPU: 0 PID: 1 at kernel/sched/fair.c:263 place_entity+0x85/0xa0
[    9.185749] Modules linked in: ip_tables
[    9.186716] CPU: 0 PID: 1 Comm: systemd Not tainted 5.9.0-rc1-00115-g88d13f778f3a28 #1
[    9.188770] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[    9.190637] RIP: 0010:place_entity+0x85/0xa0
[    9.191717] Code: 48 81 3b 00 00 10 00 75 25 48 01 c5 eb cd 80 3d d8 1b 70 01 00 75 aa 48 c7 c7 06 ba 33 aa c6 05 c8 1b 70 01 01 e8 9d c6 fb ff <0f> 0b eb 93 48 89 da be 00 00 10 00 48 89 c7 e8 47 d3 ff ff eb c9
[    9.195587] RSP: 0018:ffffa7b180013dd0 EFLAGS: 00010086
[    9.196787] RAX: 0000000000000000 RBX: ffff9ae9d74f0600 RCX: 0000000000000000
[    9.198252] RDX: 0000000000000003 RSI: ffffffffaafbecb3 RDI: ffffffffaafbc86c
[    9.199896] RBP: 00000000e79bcfc3 R08: 00000002235af97b R09: 0000000000000013
[    9.201365] R10: 000000000000072d R11: 0000000000000000 R12: 0000000000000000
[    9.202843] R13: 0000000000000001 R14: ffff9aea3fc2b300 R15: 0000000000000000
[    9.204463] FS:  00007f8c948f3940(0000) GS:ffff9aea3fc00000(0000) knlGS:0000000000000000
[    9.206319] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.207669] CR2: 0000558ff0cb9b98 CR3: 000000012f9f0000 CR4: 00000000000006f0
[    9.209192] Call Trace:
[    9.210687]  enqueue_entity+0x218/0x3a0
[    9.211809]  enqueue_task_fair+0x98/0x720
[    9.212759]  sched_move_task+0x184/0x1a0
[    9.213694]  autogroup_move_group+0x97/0x180
[    9.214682]  sched_autogroup_create_attach+0xca/0x1c0
[    9.215908]  ksys_setsid+0xe9/0x120
[    9.216764]  __do_sys_setsid+0xa/0x20
[    9.217650]  do_syscall_64+0x33/0x40
[    9.218518]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[    9.219753] RIP: 0033:0x7f8c95a81797
[    9.220630] Code: 73 01 c3 48 8b 0d f9 36 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 70 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c9 36 0f 00 f7 d8 64 89 01 48
[    9.224523] RSP: 002b:00007ffe1ba622a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000070
[    9.226255] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8c95a81797
[    9.227834] RDX: 00000000ffffffff RSI: 00007ffe1ba62260 RDI: 0000000000000000
[    9.229301] RBP: 0000000000000005 R08: 0000000000000020 R09: 0000000000000000
[    9.230772] R10: 0000000000000008 R11: 0000000000000202 R12: 00007ffe1ba625d8
[    9.232371] R13: 0000558ff0cae6d0 R14: 0000000000000000 R15: 0000000000000001
[    9.233901] ---[ end trace c7ae918a59a4910d ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.9.0-rc1-00115-g88d13f778f3a28 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
lkp


View attachment "config-5.9.0-rc1-00115-g88d13f778f3a28" of type "text/plain" (159083 bytes)

View attachment "job-script" of type "text/plain" (4935 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (15080 bytes)