linux-kernel - Re: [LKP] [vfs] fd0002870b: BUG:KASAN:null-ptr-deref_in_n

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Date:   Wed, 12 Sep 2018 08:34:52 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LKP] [vfs] fd0002870b: BUG:KASAN:null-ptr-deref_in_n


On 09/12/2018 04:29 AM, David Howells wrote:
> kernel test robot <rong.a.chen@...el.com> wrote:
>
>> [   18.568403]  nfs_fs_mount+0x901/0x1220
> I don't suppose you can tell me what file and line number this corresponds to?
$ faddr2line vmlinux nfs_fs_mount+0x901
nfs_fs_mount+0x901/0x1218:
nfs_parse_devname at fs/nfs/super.c:1911
  (inlined by) nfs_validate_text_mount_data at fs/nfs/super.c:2187
  (inlined by) nfs_fs_mount at fs/nfs/super.c:2684

>
> Also, can you tell me what the mount parameters were?  I'm not sure how to
> extract them from the information provided.
qemu command (you could get from 'bin/lkp qemu -k <bzImage> job-script'):

qemu-system-x86_64 -enable-kvm -fsdev 
local,id=test_dev,path=/home/nfs/.lkp//result/boot/1/vm-kbuild-1G/debian-x86_64-2018-04-03.cgz/x86_64-randconfig-r0-09070102/gcc-6/fd0002870b453c58d0d8c195954f5049bc6675fb/0,security_model=none 
-device virtio-9p-pci,fsdev=test_dev,mount_tag=9p/virtfs_mount -kernel 
vmlinuz-4.19.0-rc1-00104-gfd00028 -append root=/dev/ram0 user=lkp 
job=/lkp/jobs/scheduled/vm-kbuild-1G-11/boot-1-debian-x86_64-2018-04-03.cgz-fd0002870b453c58d0d8c195954f5049bc6675fb-20180910-6016-1hqt4et-1.yaml 
ARCH=x86_64 kconfig=x86_64-randconfig-r0-09070102 
branch=linux-devel/devel-hourly-2018090623 
commit=fd0002870b453c58d0d8c195954f5049bc6675fb 
BOOT_IMAGE=/pkg/linux/x86_64-randconfig-r0-09070102/gcc-6/fd0002870b453c58d0d8c195954f5049bc6675fb/vmlinuz-4.19.0-rc1-00104-gfd00028 
max_uptime=600 
RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2018-04-03.cgz/x86_64-randconfig-r0-09070102/gcc-6/fd0002870b453c58d0d8c195954f5049bc6675fb/3 
LKP_LOCAL_RUN=1 debug apic=debug sysrq_always_enabled 
rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on 
panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 
prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err 
ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 
console=ttyS0,115200 vga=normal rw  ip=dhcp 
result_service=9p/virtfs_mount -initrd /home/nfs/.lkp/cache/final_initrd 
-smp 2 -m 1024M -no-reboot -watchdog i6300esb -rtc base=localtime 
-device e1000,netdev=net0 -netdev user,id=net0 -display none -monitor 
null -serial stdio -device virtio-scsi-pci,id=scsi0 -drive 
file=/tmp/vdisk-nfs/disk-vm-kbuild-1G-11-0,if=none,id=hd0,media=disk,aio=native,cache=none 
-device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive 
file=/tmp/vdisk-nfs/disk-vm-kbuild-1G-11-1,if=none,id=hd1,media=disk,aio=native,cache=none 
-device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive 
file=/tmp/vdisk-nfs/disk-vm-kbuild-1G-11-2,if=none,id=hd2,media=disk,aio=native,cache=none 
-device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive 
file=/tmp/vdisk-nfs/disk-vm-kbuild-1G-11-3,if=none,id=hd3,media=disk,aio=native,cache=none 
-device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive 
file=/tmp/vdisk-nfs/disk-vm-kbuild-1G-11-4,if=none,id=hd4,media=disk,aio=native,cache=none 
-device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4

Best Regards,
Rong Chen

>
> Thanks,
> David
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> LKP@...ts.01.org
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