[LKP] Re: [mm/debug] 87c4696d57: kernel_BUG_at_include/linux/mm.h

[Rong Chen]

On 1/7/20 2:46 PM, Anshuman Khandual wrote:
> On 12/27/2019 07:52 PM, kernel test robot wrote:
>> [    9.781974] kernel BUG at include/linux/mm.h:592!
>> [    9.782810] invalid opcode: 0000 [#1] PTI
>> [    9.783443] CPU: 0 PID: 1 Comm: swapper Not tainted 5.5.0-rc3-00001-g87c4696d57b5e #1
>> [    9.784528] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
>> [    9.785756] EIP: __free_pages+0x14/0x40
>> [    9.786442] Code: 0c 9c 5e fa 89 d8 e8 5b f3 ff ff 56 9d 5b 5e 5d c3 8d 74 26 00 90 8b 48 1c 55 89 e5 85 c9 75 16 ba b4 b6 84 d6 e8 ac 49 fe ff <0f> 0b 8d b4 26 00 00 00 00 8d 76 00 ff 48 1c 75 10 85 d2 75 07 e8
>> [    9.789697] EAX: d68761f7 EBX: ea52f000 ECX: ea4f8520 EDX: d684b6b4
>> [    9.790850] ESI: 00000000 EDI: ef45e000 EBP: ea501f08 ESP: ea501f08
>> [    9.791879] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010286
>> [    9.792783] CR0: 80050033 CR2: ffffffff CR3: 16d00000 CR4: 000406b0
>> [    9.792783] Call Trace:
>> [    9.792783]  free_pages+0x3c/0x50
>> [    9.792783]  pgd_free+0x5a/0x170
>> [    9.792783]  __mmdrop+0x42/0xe0
>> [    9.792783]  debug_vm_pgtable+0x54f/0x567
>> [    9.792783]  kernel_init_freeable+0x90/0x1e3
>> [    9.792783]  ? rest_init+0xf0/0xf0
>> [    9.792783]  kernel_init+0x8/0xf0
>> [    9.792783]  ret_from_fork+0x19/0x24
>> [    9.792783] Modules linked in:
>> [    9.792803] ---[ end trace 91b7335adcf0b656 ]---
>>
>>
>> To reproduce:
>>
>>          # build kernel
>> 	cd linux
>> 	cp config-5.5.0-rc3-00001-g87c4696d57b5e .config
>> 	make HOSTCC=gcc-7 CC=gcc-7 ARCH=i386 olddefconfig prepare modules_prepare bzImage
>>
>>          git clone https://github.com/intel/lkp-tests.git
>>          cd lkp-tests
>>          bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
> Hello,
>
> As the failure might be happening during boot when the test executes,
> do we really need to run these LKP based QEMU environment in order to
> reproduce the problem ? Could not this be recreated on a standalone
> system.
>
> - Anshuman

Hi Anshuman,

Thanks for your advice, we provided another reproduce method which is in 
the end of dmesg.xz file attached in original report:
but the initrd file need to be supplied.

qemu-img create -f qcow2 disk-vm-snb-89942dcb126f-0 256G
qemu-img create -f qcow2 disk-vm-snb-89942dcb126f-1 256G
qemu-img create -f qcow2 disk-vm-snb-89942dcb126f-2 256G
qemu-img create -f qcow2 disk-vm-snb-89942dcb126f-3 256G
qemu-img create -f qcow2 disk-vm-snb-89942dcb126f-4 256G
qemu-img create -f qcow2 disk-vm-snb-89942dcb126f-5 256G
qemu-img create -f qcow2 disk-vm-snb-89942dcb126f-6 256G

kvm=(
›   qemu-system-x86_64
›   -enable-kvm
›   -cpu SandyBridge
›   -kernel $kernel
›   -initrd initrd-vm-snb-89942dcb126f
›   -m 8192
›   -smp 2
›   -device e1000,netdev=net0
›   -netdev user,id=net0,hostfwd=tcp::32032-:22
›   -boot order=nc
›   -no-reboot
›   -watchdog i6300esb
›   -watchdog-action debug
›   -rtc base=localtime
›   -drive file=disk-vm-snb-89942dcb126f-0,media=disk,if=virtio
›   -drive file=disk-vm-snb-89942dcb126f-1,media=disk,if=virtio
›   -drive file=disk-vm-snb-89942dcb126f-2,media=disk,if=virtio
›   -drive file=disk-vm-snb-89942dcb126f-3,media=disk,if=virtio
›   -drive file=disk-vm-snb-89942dcb126f-4,media=disk,if=virtio
›   -drive file=disk-vm-snb-89942dcb126f-5,media=disk,if=virtio
›   -drive file=disk-vm-snb-89942dcb126f-6,media=disk,if=virtio
›   -serial stdio
›   -display none
›   -monitor null
)

append=(
›   ip=::::vm-snb-89942dcb126f::dhcp
›   root=/dev/ram0
›   user=lkp
›   job=/job-script
› ARCH=i386
›   kconfig=i386-randconfig-h001-20191225
›   branch=linux-devel/devel-hourly-2019122518
›   commit=87c4696d57b5e380bc2720fdff0772b042462b7d
› 
BOOT_IMAGE=/pkg/linux/i386-randconfig-h001-20191225/gcc-7/87c4696d57b5e380bc2720fdff0772b042462b7d/vmlinuz-5.5.0-rc3-00001-g87c4696d57b5e
›   max_uptime=1500
› 
RESULT_ROOT=/result/trinity/300s/vm-snb/yocto-minimal-i386-2019-05-20.cgz/i386-randconfig-h001-20191225/gcc-7/87c4696d57b5e380bc2720fdff0772b042462b7d/8
›   result_service=tmpfs
›   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
›   rcuperf.shutdown=0
›   watchdog_thresh=60
)

"${kvm[@]}" -append "${append[*]}"


We will definitely give serious thought to your suggestion.

Best Regards,
Rong Chen
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