Re: [kallsyms] 06862f34f6: BUG: unable to handle kernel NULL pointer dereference at (null)

From: Huang, Ying <ying.huang@intel.com>
To: lkp@lists.01.org
Subject: Re: [kallsyms] 06862f34f6: BUG: unable to handle kernel NULL pointer dereference at (null)
Date: Wed, 27 Jan 2016 08:45:16 +0800	[thread overview]
Message-ID: <87twlz4zqb.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <CAKv+Gu_bsUrq2d3DYKc7Lo1ju62iw8ATt+mpynNnLRws5TSkdw@mail.gmail.com>

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Ard Biesheuvel <ard.biesheuvel@linaro.org> writes:

> On 22 January 2016 at 03:20, kernel test robot
> <ying.huang@linux.intel.com> wrote:
>> FYI, we noticed the below changes on
>>
>> https://git.linaro.org/people/ard.biesheuvel/linux-arm kallsyms-text-relative
>> commit 06862f34f614bb6ff6a9fc9c4b0d849e2ee2018d ("kallsyms: add
>> support for relative offsets in kallsyms address table")
>>
>>
>> +-----------------------------------------------------------+------------+------------+
>> |                                                           | 30f05309bd | 06862f34f6 |
>> +-----------------------------------------------------------+------------+------------+
>> | boot_successes                                            | 0          | 0          |
>> | boot_failures                                             | 6          | 8          |
>> | Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode= | 4          |            |
>> | BUG:kernel_test_oversize                                  | 2          |            |
>> | BUG:unable_to_handle_kernel                               | 0          | 8          |
>> +-----------------------------------------------------------+------------+------------+
>>
>>
>>
>> [    0.568228] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
>> [    0.568971] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
>> [    0.569835] CPU: Intel Xeon E312xx (Sandy Bridge) (family: 0x6, model: 0x2a, stepping: 0x1)
>> [    0.598441] BUG: unable to handle kernel NULL pointer dereference at           (null)
>> [    0.599646] IP:
>> [    0.599884] BUG: unable to handle kernel NULL pointer dereference at           (null)
>> [    0.610184] IP:
>> Elapsed time: 10
>> qemu-system-x86_64 -enable-kvm -cpu SandyBridge -kernel
>> /pkg/linux/x86_64-randconfig-s4-01220217/gcc-5/06862f34f614bb6ff6a9fc9c4b0d849e2ee2018d/vmlinuz-4.4.0-10063-g06862f34
>> -append 'root=/dev/ram0 user=lkp
>> job=/lkp/scheduled/vm-kbuild-yocto-x86_64-62/bisect_boot-1-yocto-minimal-x86_64.cgz-x86_64-randconfig-s4-01220217-06862f34f614bb6ff6a9fc9c4b0d849e2ee2018d-20160122-39812-uowsx2-0.yaml
>> ARCH=x86_64 kconfig=x86_64-randconfig-s4-01220217
>> branch=linux-devel/devel-spot-201601220143
>> commit=06862f34f614bb6ff6a9fc9c4b0d849e2ee2018d
>> BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s4-01220217/gcc-5/06862f34f614bb6ff6a9fc9c4b0d849e2ee2018d/vmlinuz-4.4.0-10063-g06862f34
>> max_uptime=600
>> RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-x86_64/yocto-minimal-x86_64.cgz/x86_64-randconfig-s4-01220217/gcc-5/06862f34f614bb6ff6a9fc9c4b0d849e2ee2018d/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_64-62::dhcp drbd.minor_count=8' -initrd
> /fs/sdg1/initrd-vm-kbuild-yocto-x86_64-62 -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/sdg1/disk0-vm-kbuild-yocto-x86_64-62,media=disk,if=virtio
> -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-x86_64-62 -serial
> file:/dev/shm/kboot/serial-vm-kbuild-yocto-x86_64-62 -daemonize
> -display none -monitor null
>>
>
> Hello Ying,
>
> Thanks for the report. Is this a clean build?

It's not clean build.

> I cannot reproduce the
> issue with the attached config. Do you have the vmlinux file available
> for inspection?

Sorry, we have no vmlinux file available.

BTW, we use gcc-5 to compile kernel.  Do you use gcc-5 or gcc-4?

Best Regards,
Huang, Ying

> Thanks,
> Ard.
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