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SubjectRe: [mtd] a2af0cae87: BUG:kernel_NULL_pointer_dereference,address
Hi Ansuel,

oliver.sang@intel.com wrote on Wed, 8 Jun 2022 23:44:04 +0800:

> Greeting,
>
> FYI, we noticed the following commit (built with gcc-11):
>
> commit: a2af0cae87a0205f2f4b89da6e628229a2f8c47f ("[PATCH v5 3/3] mtd: core: introduce of support for dynamic partitions")
> url: https://github.com/intel-lab-lkp/linux/commits/Ansuel-Smith/Add-nvmem-support-for-dynamic-partitions/20220606-232755
> base: https://git.kernel.org/cgit/linux/kernel/git/mtd/linux.git mtd/next
> patch link: https://lore.kernel.org/linux-mtd/20220606151417.19227-4-ansuelsmth@gmail.com
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

Can you look into this?

Thanks,
Miquèl

>
>
> +---------------------------------------------+------------+------------+
> | | 96a45c785b | a2af0cae87 |
> +---------------------------------------------+------------+------------+
> | boot_successes | 25 | 0 |
> | boot_failures | 0 | 12 |
> | BUG:kernel_NULL_pointer_dereference,address | 0 | 12 |
> | Oops:#[##] | 0 | 12 |
> | EIP:add_mtd_device | 0 | 12 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 12 |
> +---------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@intel.com>
>
>
> [ 2.820056][ T1] BUG: kernel NULL pointer dereference, address: 00000360
> [ 2.821034][ T1] #PF: supervisor read access in kernel mode
> [ 2.821862][ T1] #PF: error_code(0x0000) - not-present page
> [ 2.822468][ T1] *pde = 00000000
> [ 2.822468][ T1] Oops: 0000 [#1]
> [ 2.822468][ T1] CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0-rc3-00074-ga2af0cae87a0 #1
> [ 2.822468][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
> [ 2.822468][ T1] EIP: add_mtd_device+0x32d/0x6a0
> [ 2.822468][ T1] Code: 01 ff ff ff 8d 50 ff 85 c2 0f 84 ec fe ff ff 31 c0 e9 ef fe ff ff 8d b4 26 00 00 00 00 8b 83 cc 03 00 00 3d 08 ff ff ff 74 0e <8b> 80 60 03 00 00 85 c0 0f 85 65 01 00 00 8b 7d 84 89 f8 e8 3b 61
> [ 2.822468][ T1] EAX: 00000000 EBX: c6eaa000 ECX: 00000001 EDX: 00000000
> [ 2.822468][ T1] ESI: 00000000 EDI: c6eaa0f8 EBP: c3f0becc ESP: c3f0be44
> [ 2.822468][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010213
> [ 2.822468][ T1] CR0: 80050033 CR2: 00000360 CR3: 0345a000 CR4: 000406d0
> [ 2.822468][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 2.822468][ T1] DR6: fffe0ff0 DR7: 00000400
> [ 2.822468][ T1] Call Trace:
> [ 2.822468][ T1] ? parse_ofoldpart_partitions+0x60/0x60
> [ 2.822468][ T1] ? mtd_part_of_parse+0x118/0x240
> [ 2.822468][ T1] ? mtd_part_of_parse+0x20e/0x240
> [ 2.822468][ T1] ? parse_mtd_partitions+0xfa/0x200
> [ 2.822468][ T1] mtd_device_parse_register+0x19f/0x2b0
> [ 2.822468][ T1] mtdram_init_device+0xb7/0x100
> [ 2.822468][ T1] init_mtdram+0x67/0xaf
> [ 2.822468][ T1] ? init_phram+0x54/0x54
> [ 2.822468][ T1] do_one_initcall+0x58/0x240
> [ 2.822468][ T1] ? rdinit_setup+0x38/0x38
> [ 2.822468][ T1] do_initcalls+0xf3/0x112
> [ 2.822468][ T1] kernel_init_freeable+0xbd/0xec
> [ 2.822468][ T1] ? rest_init+0x100/0x100
> [ 2.822468][ T1] kernel_init+0x12/0xf0
> [ 2.822468][ T1] ret_from_fork+0x1c/0x30
> [ 2.822468][ T1] Modules linked in:
> [ 2.822468][ T1] CR2: 0000000000000360
> [ 2.822468][ T1] ---[ end trace 0000000000000000 ]---
> [ 2.822468][ T1] EIP: add_mtd_device+0x32d/0x6a0
> [ 2.822468][ T1] Code: 01 ff ff ff 8d 50 ff 85 c2 0f 84 ec fe ff ff 31 c0 e9 ef fe ff ff 8d b4 26 00 00 00 00 8b 83 cc 03 00 00 3d 08 ff ff ff 74 0e <8b> 80 60 03 00 00 85 c0 0f 85 65 01 00 00 8b 7d 84 89 f8 e8 3b 61
> [ 2.822468][ T1] EAX: 00000000 EBX: c6eaa000 ECX: 00000001 EDX: 00000000
> [ 2.822468][ T1] ESI: 00000000 EDI: c6eaa0f8 EBP: c3f0becc ESP: c3f0be44
> [ 2.822468][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010213
> [ 2.822468][ T1] CR0: 80050033 CR2: 00000360 CR3: 0345a000 CR4: 000406d0
> [ 2.822468][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 2.822468][ T1] DR6: fffe0ff0 DR7: 00000400
> [ 2.822468][ T1] Kernel panic - not syncing: Fatal exception
> [ 2.822468][ T1] Kernel Offset: disabled
>
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.18.0-rc3-00074-ga2af0cae87a0 .config
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
> cd <mod-install-dir>
> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
>
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
>
> # if come across any failure that blocks the test,
> # please remove ~/.lkp and /lkp dir to run from a clean state.
>
>
>

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