linux-kernel - [power_supply] 7f8d22d52d: WARNING: CPU: 0 PID: 1 at drivers/power/power_supply_core.c:569 power_supply_read

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Date:	Sat, 04 Jun 2016 12:52:30 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Rhyland Klein <rklein@...dia.com>
Cc:	lkp@...org, LKML <linux-kernel@...r.kernel.org>,
	0day robot <fengguang.wu@...el.com>
Subject: [power_supply] 7f8d22d52d: WARNING: CPU: 0 PID: 1 at
 drivers/power/power_supply_core.c:569 power_supply_read_temp+0x87/0x90



FYI, we noticed the following commit:

https://github.com/0day-ci/linux Rhyland-Klein/power_supply-power_supply_read_temp-only-if-use_cnt-0/20160604-043353
commit 7f8d22d52dade417e135fd1c08ab9977882ff0b6 ("power_supply: power_supply_read_temp only if use_cnt > 0")


on test machine: vm-kbuild-yocto-x86_64: 1 threads qemu-system-x86_64 -enable-kvm -cpu SandyBridge with 320M memory

caused below changes:


+----------------+------------+------------+
|                | 4a99fa06a8 | 7f8d22d52d |
+----------------+------------+------------+
| boot_successes | 4          | 0          |
+----------------+------------+------------+



[    2.427327] power_supply test_battery: uevent
[    2.427748] power_supply test_battery: POWER_SUPPLY_NAME=test_battery
[    2.428409] ------------[ cut here ]------------
[    2.428895] WARNING: CPU: 0 PID: 1 at drivers/power/power_supply_core.c:569 power_supply_read_temp+0x87/0x90
[    2.430001] CPU: 0 PID: 1 Comm: swapper Not tainted 4.6.0-rc2-00006-g7f8d22d #1
[    2.430700] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    2.431570]  0000000000000000 ffff880012857cd0 ffffffff81493375 ffff880012857d10
[    2.432524]  ffffffff81082d09 0000023912857d18 ffff88000e8ad000 ffff880012857d84
[    2.433723]  ffff88000e8adbc0 ffffffff823f6ec0 ffff88000e8ad800 ffff880012857d20
[    2.434597] Call Trace:
[    2.434843]  [<ffffffff81493375>] dump_stack+0x19/0x24
[    2.435341]  [<ffffffff81082d09>] __warn+0xb9/0xe0
[    2.435799]  [<ffffffff81082de8>] warn_slowpath_null+0x18/0x20
[    2.436358]  [<ffffffff81be8187>] power_supply_read_temp+0x87/0x90
[    2.436939]  [<ffffffff81c4d76f>] thermal_zone_get_temp+0x4f/0x70
[    2.437519]  [<ffffffff81c4d7a7>] thermal_zone_device_update+0x17/0x110
[    2.438214]  [<ffffffff814aeff6>] ? debug_object_init+0x16/0x20
[    2.438778]  [<ffffffff81c4f284>] thermal_zone_device_register+0x834/0x920
[    2.439431]  [<ffffffff81be8512>] __power_supply_register+0x242/0x500
[    2.440041]  [<ffffffff81be8c3e>] power_supply_register+0xe/0x10
[    2.440626]  [<ffffffff82a2b96d>] test_power_init+0x4b/0xb2
[    2.441160]  [<ffffffff82a2b922>] ? wm831x_backup_driver_init+0x14/0x14
[    2.441799]  [<ffffffff829e8ff6>] do_one_initcall+0xf1/0x182
[    2.442344]  [<ffffffff829e87ca>] ? set_debug_rodata+0x12/0x12
[    2.442896]  [<ffffffff829e91a6>] kernel_init_freeable+0x11f/0x1a7
[    2.443488]  [<ffffffff820f79a9>] kernel_init+0x9/0xf0
[    2.443995]  [<ffffffff82100b62>] ret_from_fork+0x22/0x40
[    2.444522]  [<ffffffff820f79a0>] ? rest_init+0x80/0x80
[    2.445028] ---[ end trace cc5ecf4c9ffecec6 ]---
[    2.445495] __power_supply_register: Expected proper parent device for 'test_usb'


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu SandyBridge -kernel /pkg/linux/x86_64-randconfig-s2-06040635/gcc-6/7f8d22d52dade417e135fd1c08ab9977882ff0b6/vmlinuz-4.6.0-rc2-00006-g7f8d22d -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-x86_64-6/bisect_boot-1-yocto-minimal-x86_64.cgz-x86_64-randconfig-s2-06040635-7f8d22d52dade417e135fd1c08ab9977882ff0b6-20160604-100904-1gq6z3z-1.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s2-06040635 branch=linux-devel/devel-spot-201606040556 commit=7f8d22d52dade417e135fd1c08ab9977882ff0b6 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s2-06040635/gcc-6/7f8d22d52dade417e135fd1c08ab9977882ff0b6/vmlinuz-4.6.0-rc2-00006-g7f8d22d max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-x86_64/yocto-minimal-x86_64.cgz/x86_64-randconfig-s2-06040635/gcc-6/7f8d22d52dade417e135fd1c08ab9977882ff0b6/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-yocto-x86_64-6::dhcp drbd.minor_count=8'  -initrd /fs/sdc1/initrd-vm-kbuild-yocto-x86_64-6 -m 320 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdc1/disk0-vm-kbuild-yocto-x86_64-6,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-x86_64-6 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-x86_64-6 -daemonize -display none -monitor null 





Thanks,
Kernel Test Robot

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