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Date:   Mon, 6 May 2019 08:38:13 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, lkp@...org
Subject: [rcutorture] ba26c41d98:
 WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_writer[rcutorture]

FYI, we noticed the following commit (built with gcc-7):

commit: ba26c41d985d7c66c6198e0e22cd287434d83a3e ("rcutorture: Fix stutter_wait() return value and freelist checks")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2019.04.28a

in testcase: rcutorture
with following parameters:

	runtime: 300s
	test: default
	torture_type: srcu

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 4G

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


+--------------------------------------------------------------------+------------+------------+
|                                                                    | fe661764bc | ba26c41d98 |
+--------------------------------------------------------------------+------------+------------+
| boot_successes                                                     | 314        | 278        |
| boot_failures                                                      | 18         | 38         |
| BUG:kernel_reboot-without-warning_in_test_stage                    | 5          | 12         |
| WARNING:at_net/sched/sch_generic.c:#dev_watchdog                   | 13         | 12         |
| RIP:dev_watchdog                                                   | 13         | 12         |
| RIP:ring_buffer_lock_reserve                                       | 1          |            |
| WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_writer[rcutorture] | 0          | 14         |
| RIP:rcu_torture_writer[rcutorture]                                 | 0          | 14         |
| calltrace:irq_exit                                                 | 0          | 8          |
| calltrace:rcu_torture_free                                         | 0          | 1          |
| RIP:__rb_reserve_next                                              | 0          | 1          |
| RIP:lock_release                                                   | 0          | 1          |
+--------------------------------------------------------------------+------------+------------+


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


[  348.855994] WARNING: CPU: 1 PID: 605 at kernel/rcu/rcutorture.c:1019 rcu_torture_writer+0x5e5/0x820 [rcutorture]
[  348.858990] Modules linked in: rcutorture(-) torture ppdev parport_pc crct10dif_pclmul crc32c_intel parport rtc_cmos qemu_fw_cfg
[  348.862052] CPU: 1 PID: 605 Comm: rcu_torture_wri Not tainted 5.1.0-rc1-00106-gba26c41 #1
[  348.864209] RIP: 0010:rcu_torture_writer+0x5e5/0x820 [rcutorture]
[  348.866629] Code: 08 a0 49 8b 06 49 39 c6 75 22 48 8b 55 00 49 8d 46 e8 48 39 c2 74 15 41 8b 56 f8 4c 89 ee 48 c7 c7 d1 83 05 a0 e8 cb 11 0c e1 <0f> 0b 49 83 c6 30 4c 39 f3 75 cd e8 9b 68 ff ff 84 c0 0f 84 97 fc
[  348.871198] RSP: 0018:ffff8881185c3eb8 EFLAGS: 00010296
[  348.872442] RAX: 0000000000000027 RBX: ffffffffa0085f78 RCX: 0000000000000006
[  348.874957] RDX: 0000000000000007 RSI: 0000000000000006 RDI: ffff88813bbd1880
[  348.876675] RBP: ffffffffa0085f68 R08: 0000005dd95e1368 R09: 0000000000000000
[  348.878449] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa005a670
[  348.880333] R13: ffffffffa0058800 R14: ffffffffa0084dd8 R15: ffffffffa0085750
[  348.882924] FS:  0000000000000000(0000) GS:ffff88813ba00000(0000) knlGS:0000000000000000
[  348.885859] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  348.887797] CR2: 00007f89476dc030 CR3: 000000011d91e000 CR4: 00000000000406a0
[  348.889811] Call Trace:
[  348.890529]  ? rcu_torture_pipe_update+0x100/0x100 [rcutorture]
[  348.892393]  kthread+0x11c/0x130
[  348.893012]  ? kthread_stop+0x210/0x210
[  348.893792]  ret_from_fork+0x24/0x30
[  348.894627] irq event stamp: 570574
[  348.895346] hardirqs last  enabled at (570573): [<ffffffff8117d893>] console_unlock+0x533/0x5c0
[  348.897770] hardirqs last disabled at (570574): [<ffffffff81003417>] trace_hardirqs_off_thunk+0x1a/0x1c
[  348.900200] softirqs last  enabled at (570562): [<ffffffff81c00414>] __do_softirq+0x414/0x450
[  348.902187] softirqs last disabled at (570549): [<ffffffff8111d557>] irq_exit+0x67/0xd0
[  348.904076] ---[ end trace 497e668e1ed2342a ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.1.0-rc1-00106-gba26c41 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 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,
Rong Chen


View attachment "config-5.1.0-rc1-00106-gba26c41" of type "text/plain" (112531 bytes)

View attachment "job-script" of type "text/plain" (4867 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (14360 bytes)

View attachment "rcutorture" of type "text/plain" (6502 bytes)

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