linux-kernel - [lkp] [usb] 9696ef14de: WARNING: CPU: 0 PID: 1 at lib/list_debug.c:36 __list

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Date:	Wed, 13 Jul 2016 09:28:21 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Peter Chen <peter.chen@....com>
Cc:	0day robot <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [usb]  9696ef14de: WARNING: CPU: 0 PID: 1 at
 lib/list_debug.c:36 __list_add+0x104/0x188


FYI, we noticed the following commit:

https://github.com/0day-ci/linux Peter-Chen/usb-udc-core-fix-error-handling/20160711-100832
commit 9696ef14ded07fb0847f8e1cdda6d98a89ecd4f2 ("usb: udc: core: fix error handling")

in testcase: boot

on test machine: 2 threads qemu-system-x86_64 -enable-kvm -cpu Nehalem with 320M memory

caused below changes:

[   22.076363] WARNING: CPU: 0 PID: 1 at lib/list_debug.c:36 __list_add+0x104/0x188
[   22.079911] list_add double add: new=ffff88000e422e10, prev=ffff88000e422e10, next=ffff8800135e9168.
[   22.086059] CPU: 0 PID: 1 Comm: swapper Tainted: G        W       4.7.0-rc4-00110-g9696ef1 #1
[   22.087856] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   22.097535]  0000000000000000 ffff88001345fc00 ffffffff8190c8e2 ffff88001345fc40
[   22.099469]  ffffffff81175453 0000002400000009 ffff88000e422e10 ffff8800135e9168
[   22.101220]  ffff88000e422e10 0000000000000000 0000000000000001 ffff88001345fca8
[   22.103291] Call Trace:
[   22.109166]  [<ffffffff8190c8e2>] dump_stack+0x19/0x1b
[   22.110520]  [<ffffffff81175453>] __warn+0x10a/0x125
[   22.111632]  [<ffffffff811754b4>] warn_slowpath_fmt+0x46/0x4e
[   22.112939]  [<ffffffff82860938>] ? klist_add_tail+0x29/0x62
[   22.114418]  [<ffffffff8194b431>] __list_add+0x104/0x188
[   22.115600]  [<ffffffff82860962>] klist_add_tail+0x53/0x62
[   22.118742]  [<ffffffff81bd24e7>] device_add+0xb03/0xcca
[   22.121931]  [<ffffffff81bd283e>] device_create_groups_vargs+0xfe/0x133
[   22.123390]  [<ffffffff81bd28e7>] device_create_with_groups+0x2b/0x2d
[   22.130047]  [<ffffffff82871904>] ? __mutex_unlock_slowpath+0x1cb/0x1d8
[   22.131513]  [<ffffffff81b909eb>] misc_register+0x1e0/0x2ec
[   22.132751]  [<ffffffff85292b08>] mousedev_init+0x55/0x81
[   22.134198]  [<ffffffff85292ab3>] ? input_leds_init+0x12/0x12
[   22.135442]  [<ffffffff8522b831>] do_one_initcall+0xdc/0x16a
[   22.139131]  [<ffffffff8522bc46>] kernel_init_freeable+0x387/0x419
[   22.142059]  [<ffffffff8286183b>] kernel_init+0xa/0x103
[   22.144618]  [<ffffffff828778bf>] ret_from_fork+0x1f/0x40
[   22.148576]  [<ffffffff82861831>] ? rest_init+0xb8/0xb8
[   22.150009] ---[ end trace 75873bca450a4fe4 ]---
[   22.151559] mousedev: PS/2 mouse device common for all mice
[   22.155003] evbug: Connected device: input0 (Power Button at LNXPWRBN/button/input0)


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu Nehalem -kernel /pkg/linux/x86_64-randconfig-s0-07121340/gcc-6/9696ef14ded07fb0847f8e1cdda6d98a89ecd4f2/vmlinuz-4.7.0-rc4-00110-g9696ef1 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-intel12-yocto-x86_64-3/bisect_boot-1-yocto-minimal-x86_64.cgz-x86_64-randconfig-s0-07121340-9696ef14ded07fb0847f8e1cdda6d98a89ecd4f2-20160712-19858-1j3k6zi-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s0-07121340 branch=linux-devel/devel-hourly-2016071211 commit=9696ef14ded07fb0847f8e1cdda6d98a89ecd4f2 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s0-07121340/gcc-6/9696ef14ded07fb0847f8e1cdda6d98a89ecd4f2/vmlinuz-4.7.0-rc4-00110-g9696ef1 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-intel12-yocto-x86_64/yocto-minimal-x86_64.cgz/x86_64-randconfig-s0-07121340/gcc-6/9696ef14ded07fb0847f8e1cdda6d98a89ecd4f2/0 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-intel12-yocto-x86_64-3::dhcp drbd.minor_count=8'  -initrd /fs/KVM/initrd-vm-intel12-yocto-x86_64-3 -m 320 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/KVM/disk0-vm-intel12-yocto-x86_64-3,media=disk,if=virtio -drive file=/fs/KVM/disk1-vm-intel12-yocto-x86_64-3,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-intel12-yocto-x86_64-3 -serial file:/dev/shm/kboot/serial-vm-intel12-yocto-x86_64-3 -daemonize -display none -monitor null 





Thanks,
Xiaolong

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