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SubjectRE: [lkp] [usb] ad05399d68: BUG: unable to handle kernel NULL pointer dereference at 0000000000000012
Date

>
>
>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")
>

Hi Xiaolong,

You reported it one month ago, and said it is a false report. see below.
Would you please double confirm it?

On Wed, Jul 13, 2016 at 01:55:26AM +0000, Peter Chen wrote:
>
>
>>-----Original Message-----
>>From: lkp-request@eclists.intel.com
>>[mailto:lkp-request@eclists.intel.com] On Behalf Of kernel test robot
>>Sent: Wednesday, July 13, 2016 9:28 AM
>>To: Peter Chen <peter.chen@nxp.com>
>>Cc: 0day robot <fengguang.wu@intel.com>; LKML
>><linux-kernel@vger.kernel.org>; lkp@01.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")
>>
>
>Thanks, but I really can't find the relationship between my patch and dump.
>Can you reproduce it after running again or without my patch?
>

Sorry, it's a false report, the error dump also showed in parent commit, please ignore the report and sorry for the noise.

Thanks,
Xiaolong




Peter

>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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