linux-kernel - [lkp] [kallsyms] f5fc9abc4e: BUG: KASAN: null-ptr-deref on address (null)

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Message-ID: <87powo6hrs.fsf@yhuang-dev.intel.com>
Date:	Tue, 26 Jan 2016 13:17:59 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:	Kees Cook <keescook@...omium.org>
Subject: [lkp] [kallsyms] f5fc9abc4e: BUG: KASAN: null-ptr-deref on address
           (null)

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kallsyms
commit f5fc9abc4e23dccfa1fc35892cf36a416d1e6aee ("kallsyms: add support for relative offsets in kallsyms address table")


+-----------------------------------------------------------+----------+------------+
|                                                           | v4.5-rc1 | f5fc9abc4e |
+-----------------------------------------------------------+----------+------------+
| boot_successes                                            | 41       | 0          |
| boot_failures                                             | 197      | 26         |
| Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode= | 169      |            |
| BUG:kernel_test_oversize                                  | 19       |            |
| BUG:workqueue_lockup-pool_cpus=#flags=#nice=#stuck_for#s  | 1        |            |
| IP-Config:Auto-configuration_of_network_failed            | 8        |            |
| BUG:KASAN:null-ptr-deref_on_address(null)                 | 0        | 26         |
| BUG:unable_to_handle_kernel                               | 0        | 26         |
+-----------------------------------------------------------+----------+------------+



[    0.354394] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
[    0.355210] CPU: Intel QEMU Virtual CPU version 2.4.0 (family: 0x6, model: 0x6, stepping: 0x3)
[    0.363389] ==================================================================
[    0.364468] BUG: KASAN: null-ptr-deref on address           (null)
[    0.365282] Read of size 8 by task swapper/1
[    0.365967] CPU: 0 PID: 1 Comm: swapper Not tainted 4.5.0-rc1-00001-gf5fc9ab #2
[    0.367025] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    0.368241]  ffff88000e0ff928 ffff88000e0ff720 ffffffff926c2d59 ffff88000e0ff7a8
[    0.369551]  ffffffff9221e54a 0000000000000000 0000000000000000 0000000000000286
[    0.370894]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    0.372206] Call Trace:
[    0.372646] BUG: unable to handle kernel paging request at 0000000011000000
[    0.373669] IP:
Elapsed time: 10
qemu-system-x86_64 -enable-kvm -kernel /pkg/linux/x86_64-randconfig-s2-01260945/gcc-5/f5fc9abc4e23dccfa1fc35892cf36a416d1e6aee/vmlinuz-4.5.0-rc1-00001-gf5fc9ab -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-x86_64-4/bisect_boot-1-quantal-core-x86_64.cgz-x86_64-randconfig-s2-01260945-f5fc9abc4e23dccfa1fc35892cf36a416d1e6aee-20160126-54763-e8aynf-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s2-01260945 branch=linux-devel/devel-hourly-2016012607 commit=f5fc9abc4e23dccfa1fc35892cf36a416d1e6aee BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s2-01260945/gcc-5/f5fc9abc4e23dccfa1fc35892cf36a416d1e6aee/vmlinuz-4.5.0-rc1-00001-gf5fc9ab max_uptime=600 RESULT_ROOT=/result/boot/1/vm-vp-quantal-x86_64/quantal-core-x86_64.cgz/x86_64-randconfig-s2-01260945/gcc-5/f5fc9abc4e23dccfa1fc35892cf36a416d1e6aee/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-vp-quantal-x86_64-4::dhcp drbd.minor_count=8'  -initrd /fs/sdh1/initrd-vm-vp-quantal-x86_64-4 -m 360 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-vp-quantal-x86_64-4 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-x86_64-4 -daemonize -display none -monitor null 





Thanks,
Kernel Test Robot

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