Message-ID: <20160815043823.GH19354@yexl-desktop>
Date:	Mon, 15 Aug 2016 12:38:24 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Peter Chen <peter.chen@....com>
Cc:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, lkp@...org
Subject: [lkp] [usb]  ad05399d68: BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000012


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git testing/next
commit ad05399d68b6ae1649cdcfc82ce3ffea1a7c5104 ("usb: udc: core: fix error handling")

in testcase: boot

on test machine: 1 threads qemu-system-x86_64 -enable-kvm -cpu SandyBridge with 512M memory

caused below changes:


+-----------------------------------------------------------+------------+------------+
|                                                           | 0937a4d787 | ad05399d68 |
+-----------------------------------------------------------+------------+------------+
| boot_successes                                            | 0          | 0          |
| boot_failures                                             | 12         | 12         |
| WARNING:at_lib/list_debug.c:#__list_del_entry             | 2          | 12         |
| BUG:kernel_test_hang                                      | 2          |            |
| backtrace:kernel_restart                                  | 2          |            |
| backtrace:SyS_reboot                                      | 2          |            |
| BUG:kernel_oversize_in_test_stage                         | 4          |            |
| Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode= | 6          |            |
| BUG:unable_to_handle_kernel                               | 0          | 11         |
| Oops                                                      | 0          | 11         |
| RIP:sysfs_kf_write                                        | 0          | 11         |
| Kernel_panic-not_syncing:Fatal_exception                  | 0          | 11         |
| backtrace:serio_handle_event                              | 0          | 12         |
| backtrace:vfs_write                                       | 0          | 11         |
| backtrace:SyS_write                                       | 0          | 11         |
+-----------------------------------------------------------+------------+------------+


[   12.161205] BUG: unable to handle kernel NULL pointer dereference at 0000000000000012
[   12.162485] IP: [<ffffffff81245ecf>] sysfs_kf_write+0x4f/0x70
[   12.163414] PGD 1a380067 PUD 1a357067 PMD 0 
[   12.164242] Oops: 0000 [#1] PREEMPT SMP
[   12.164952] CPU: 0 PID: 240 Comm: udevadm Tainted: G        W       4.8.0-rc1-00021-gad05399 #1
[   12.166477] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   12.167885] task: ffff88001a3701c0 task.stack: ffff88001a374000
[   12.168789] RIP: 0010:[<ffffffff81245ecf>]  [<ffffffff81245ecf>] sysfs_kf_write+0x4f/0x70
[   12.170082] RSP: 0018:ffff88001a377dc0  EFLAGS: 00010297
[   12.171001] RAX: ffff88001aad9260 RBX: 0000000000000000 RCX: 0000000000000003
[   12.172252] RDX: ffff88001a253020 RSI: ffffffff82888fa0 RDI: ffff88001aada1f8
[   12.186536] RBP: ffff88001a377de8 R08: 0000000000000000 R09: 0000000000000000
[   12.187769] R10: 0000000055aab65f R11: 0000000000000001 R12: 0000000000000003
[   12.189058] R13: ffff88001a393000 R14: 000000000000000a R15: ffff88001a253020
[   12.190274] FS:  00007f1f13d8f700(0000) GS:ffff88001f400000(0000) knlGS:0000000000000000
[   12.191514] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.192393] CR2: 0000000000000012 CR3: 000000001a341000 CR4: 00000000000406b0
[   12.193518] Stack:
[   12.193884]  ffff88001a253020 ffff88001a393000 0000000000000003 ffffffff81245e80
[   12.195278]  ffff88001a393018 ffff88001a377e28 ffffffff81244e44 ffff88001a377f20
[   12.196679]  ffff88001dc6fc40 ffffffff81244cf0 ffff88001a377f20 0000000000000003
[   12.197896] Call Trace:
[   12.198289]  [<ffffffff81245e80>] ? sysfs_file_ops+0x90/0x90
[   12.199162]  [<ffffffff81244e44>] kernfs_fop_write+0x154/0x200
[   12.211238]  [<ffffffff81244cf0>] ? kernfs_vma_page_mkwrite+0xb0/0xb0
[   12.212330]  [<ffffffff811ae953>] __vfs_write+0x43/0x1b0
[   12.213150]  [<ffffffff811b369a>] ? __sb_start_write+0xba/0x110
[   12.214175]  [<ffffffff810d4612>] ? percpu_down_read+0x52/0x90
[   12.215219]  [<ffffffff811b369a>] ? __sb_start_write+0xba/0x110
[   12.216256]  [<ffffffff811aecd6>] vfs_write+0x106/0x1f0
[   12.217146]  [<ffffffff811aeed3>] SyS_write+0x53/0xc0
[   12.217930]  [<ffffffff820250b6>] entry_SYSCALL_64_fastpath+0x1e/0xad
[   12.218907] Code: ff ff 4d 85 e4 74 2d 49 89 c6 e8 0d 25 ee ff 49 8b 45 00 4c 89 e1 4c 89 fa 48 8b b0 80 00 00 00 48 8b 40 28 48 8b b8 80 00 00 00 <41> ff 56 08 48 89 c3 eb 00 e8 e3 24 ee ff 48 89 d8 5b 41 5c 41 
[   12.223712] RIP  [<ffffffff81245ecf>] sysfs_kf_write+0x4f/0x70
[   12.224633]  RSP <ffff88001a377dc0>
[   12.225172] CR2: 0000000000000012
[   12.366338] ---[ end trace b696b5aff8dfca8d ]---
[   12.367092] Kernel panic - not syncing: Fatal exception
[   12.367920] Kernel Offset: disabled


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu SandyBridge -kernel /pkg/linux/x86_64-randconfig-n0-08110915/gcc-6/ad05399d68b6ae1649cdcfc82ce3ffea1a7c5104/vmlinuz-4.8.0-rc1-00021-gad05399 -append 'ip=::::vm-kbuild-yocto-x86_64-3::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-x86_64-3/boot-1-yocto-minimal-x86_64.cgz-ad05399d68b6ae1649cdcfc82ce3ffea1a7c5104-20160812-122343-ax2dev-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-n0-08110915 branch=linux-devel/devel-hourly-2016081104 commit=ad05399d68b6ae1649cdcfc82ce3ffea1a7c5104 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-n0-08110915/gcc-6/ad05399d68b6ae1649cdcfc82ce3ffea1a7c5104/vmlinuz-4.8.0-rc1-00021-gad05399 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-x86_64/yocto-minimal-x86_64.cgz/x86_64-randconfig-n0-08110915/gcc-6/ad05399d68b6ae1649cdcfc82ce3ffea1a7c5104/0 LKP_SERVER=inn 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 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw drbd.minor_count=8'  -initrd /fs/sdg1/initrd-vm-kbuild-yocto-x86_64-3 -m 512 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -drive file=/fs/sdg1/disk0-vm-kbuild-yocto-x86_64-3,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-x86_64-3 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-x86_64-3 -daemonize -display none -monitor null 





Thanks,
Xiaolong

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