Re: [efi] 1c5fecb612: WARNING:at_kernel/iomem.c:#memremap

[Rong Chen]

On 12/2/19 5:41 PM, Ard Biesheuvel wrote:
> On Sun, 1 Dec 2019 at 16:53, kernel test robot <rong.a.chen@xxxxxxxxx> wrote:
> > FYI, we noticed the following commit (built with gcc-7):
> >
> > commit: 1c5fecb61255aa12a16c4c06335ab68979865914 ("efi: Export Runtime Configuration Interface table to sysfs")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >
> > in testcase: rcutorture
> > with following parameters:
> >
> >          runtime: 300s
> >          test: default
> >          torture_type: tasks
> >
> > test-description: rcutorture is rcutorture kernel module load/unload test.
> > test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt
> >
> >
> > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
> >
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> >
> >
> > +------------------------------------------------+------------+------------+
> > |                                                | 5828efb95b | 1c5fecb612 |
> > +------------------------------------------------+------------+------------+
> > | boot_successes                                 | 0          | 0          |
> > | boot_failures                                  | 4          | 4          |
> > | Kernel_panic-not_syncing:No_working_init_found | 4          | 4          |
> > | WARNING:at_kernel/iomem.c:#memremap            | 0          | 4          |
> > | EIP:memremap                                   | 0          | 4          |
> > +------------------------------------------------+------------+------------+
> I don't understand this result. Doesn't it say the number of failures
> is the same, but it just fails in a different place? Is there a
> working config that breaks due to that commit?

Hi Ard,

The results means all boot are failed, parent commit fails at 
"Kernel_panic-not_syncing:No_working_init_found"
which may causes by the wrong test environment, but the commit 
"1c5fecb612" introduced a new error:
"WARNING:at_kernel/iomem.c:#memremap".

We prepared the reproduce steps and config file in report mail: 
20191201155238.GR18573@shao2-debian/">https://lore.kernel.org/lkml/20191201155238.GR18573@shao2-debian/

Best Regards,
Rong Chen

> > If you fix the issue, kindly add following tag
> > Reported-by: kernel test robot <rong.a.chen@xxxxxxxxx>
> >
> >
> > [   27.829857] WARNING: CPU: 0 PID: 1 at kernel/iomem.c:82 memremap+0x62/0x148
> > [   27.832571] Modules linked in:
> > [   27.833528] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G                T 5.3.0-rc1-00004-g1c5fecb61255a #2
> > [   27.836364] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> > [   27.838876] EIP: memremap+0x62/0x148
> > [   27.840028] Code: 89 c7 83 f8 02 75 2a 80 3d bb 47 c8 c1 00 0f 85 bd 00 00 00 c6 05 bb 47 c8 c1 01 53 8d 45 ec 50 68 78 3c a5 c1 e8 f2 ff f1 ff <0f> 0b e9 9d 00 00 00 31 c0 f7 c6 01 00 00 00 74 65 85 ff 74 0f 89
> > [   27.845798] EAX: 0000003f EBX: 0000001e ECX: 00000000 EDX: 30706000
> > [   27.847665] ESI: 00000001 EDI: 00000002 EBP: e9e03f0c ESP: e9e03ee4
> > [   27.849523] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010282
> > [   27.851616] CR0: 80050033 CR2: 08056130 CR3: 01db5000 CR4: 000406b0
> > [   27.853465] Call Trace:
> > [   27.853896]  ? kobject_add+0x5b/0x66
> > [   27.854502]  ? map_properties+0x425/0x425
> > [   27.855171]  efi_rci2_sysfs_init+0x1f/0x1e2
> > [   27.855873]  ? map_properties+0x425/0x425
> > [   27.856545]  do_one_initcall+0xa0/0x1cb
> > [   27.857187]  ? parse_args+0xa3/0x28b
> > [   27.857823]  ? trace_initcall_level+0x53/0x6e
> > [   27.858548]  kernel_init_freeable+0x102/0x190
> > [   27.859300]  ? rest_init+0xee/0xee
> > [   27.859887]  kernel_init+0xd/0xdf
> > [   27.860443]  ret_from_fork+0x1e/0x28
> > [   27.861144] ---[ end trace c5c6f0b028e1905c ]---
> >
> >
> > To reproduce:
> >
> >          # build kernel
> >          cd linux
> >          cp config-5.3.0-rc1-00004-g1c5fecb61255a .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
> >
> >
> >
> > Thanks,
> > Rong Chen