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From:   Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date:   Mon, 2 Dec 2019 10:41:23 +0100
Message-ID: <CAKv+Gu8MO_85Fa0y7YZ0iEgxrXbfR5-1e37FbiByzP8LrohcYA@mail.gmail.com>
Subject: Re: [efi] 1c5fecb612: WARNING:at_kernel/iomem.c:#memremap
To:     kernel test robot <rong.a.chen@intel.com>
Cc:     Narendra K <Narendra.K@dell.com>,
        Mario Limonciello <mario.limonciello@dell.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        lkp@lists.01.org
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Sender: linux-kernel-owner@vger.kernel.org
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On Sun, 1 Dec 2019 at 16:53, kernel test robot <rong.a.chen@intel.com> 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?


>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen@intel.com>
>
>
> [   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
>