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Subject: Re: kernel panic when scanning MTD partitions
To:     Corentin Labbe <clabbe.montjoie@gmail.com>,
        miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com
Cc:     linux-block@vger.kernel.org, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org
References: <YMntfiE7J8r0dtV1@Red>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <1424d9da-5e11-3ba8-82ae-85f95f60ca9d@kernel.dk>
Date:   Wed, 16 Jun 2021 06:54:41 -0600
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On 6/16/21 6:24 AM, Corentin Labbe wrote:
> Hello
> 
> When scanning MTD partitions my kernel panic:
> Searching for RedBoot partition table in 30000000.flash at offset 0xfe0000
> 7 RedBoot partitions found on MTD device 30000000.flash
> Creating 7 MTD partitions on "30000000.flash":
> 0x000000000000-0x000000020000 : "BOOT"
> 8<--- cut here ---
> Unable to handle kernel NULL pointer dereference at virtual address 00000034
> pgd = (ptrval)
> [00000034] *pgd=00000000
> Internal error: Oops: 17 [#1] PREEMPT ARM
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper Not tainted 5.13.0-rc6-next-20210615+ #101
> Hardware name: Gemini (Device Tree)
> PC is at _set_bit+0x20/0x4c
> LR is at blk_queue_write_cache+0x20/0x5c
> pc : [<c02f2194>]    lr : [<c029d6c0>]    psr: 60000093
> sp : c1439ca0  ip : 60000013  fp : c4058c00
> r10: 00000000  r9 : c4058ab8  r8 : c1c553b8
> r7 : c3f71080  r6 : 00000000  r5 : 00000000  r4 : 00000000
> r3 : 00020000  r2 : 00000011  r1 : 00000034  r0 : 00000000
> Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
> Control: 0000397f  Table: 02338000  DAC: 00000053
> Register r0 information: NULL pointer
> Register r1 information: non-paged memory
> Register r2 information: non-paged memory
> Register r3 information: non-paged memory
> Register r4 information: NULL pointer
> Register r5 information: NULL pointer
> Register r6 information: NULL pointer
> Register r7 information: slab kmalloc-128 start c3f71080 pointer offset 0 size 128
> Register r8 information: slab dentry start c1c553b8 pointer offset 0 size 40
> Register r9 information: slab kmalloc-1k start c4058800 pointer offset 696 size 1024
> Register r10 information: NULL pointer
> Register r11 information: slab kmalloc-1k start c4058c00 pointer offset 0 size 1024
> Register r12 information: non-paged memory
> Process swapper (pid: 1, stack limit = 0x(ptrval))
> Stack: (0xc1439ca0 to 0xc143a000)
> 9ca0: c231a480 c07ab67c 00000000 c03cd1b8 00000000 c00f4b18 c07ab67c c231a480
> 9cc0: c4058c00 c07ab67c 05a00000 c03ce474 c07ab67c c4058c00 c07ab658 c03ccf88
> 9ce0: c4058c00 c07ab660 c07ab434 c03c7328 c068ab50 00000000 c4058cf8 c40912c0
> 9d00: ffffffff 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 9d20: 00000101 00000000 00000001 c03c6ba8 00000000 00020000 00000001 00000001
> 9d40: c4058c00 00000000 00000000 4af56ea3 00000000 c4058800 c4058800 c406f000
> 9d60: 00000007 c03ca0fc 00000000 00000000 00000007 c07ab638 c05c6c84 00000000
> 9d80: 00000007 c4058800 c1438000 00000000 00000000 c03c9f90 00000001 c05c6c88
> 9da0: 00000000 00000000 c406f000 00000007 c07ab638 4af56ea3 00002201 c4058800
> 9dc0: c05c6c84 00000000 00000000 c221c2a0 c2215810 00000000 00000000 c03c7694
> 9de0: 00000001 c4009c20 c4008500 c2215800 c221c2a0 c03dc4a0 00000000 c0196864
> 9e00: 00000000 c4008500 c4052b58 00000000 00000002 4af56ea3 00000000 00000000
> 9e20: c2215810 c07ab928 00000000 c07ab928 00000000 c07bb000 c06f73e0 c037b898
> 9e40: c2215810 c0815554 00000000 00000000 c07ab928 c03796fc c2215810 c07ab928
> 9e60: c2215854 c07ab928 c071c830 c06d408c c07bb000 c0379b4c c2215810 00000000
> 9e80: c2215854 c037a0ec 00000000 c07ab928 c2215810 c07a9fb0 c071c830 c037a17c
> 9ea0: 00000000 c07ab928 c037a0f4 c0377584 c143e11c c143e10c c140c530 4af56ea3
> 9ec0: c07ab928 c4008480 00000000 c0378a68 c068d2f4 c068d2f4 c06f73e0 c07ab928
> 9ee0: 00000000 00000000 c07bb000 c037a818 c07117f8 ffffe000 00000000 c00097ac
> 9f00: c1403b00 c1403b08 c1403aff c0035200 00000000 c0694bc0 0000009f 00000000
> 9f20: 00000000 c06f73e0 00000006 00000006 00000000 c1403b16 c1403b1d 4af56ea3
> 9f40: 00000000 00000006 0000009f 4af56ea3 c071c84c c0724380 00000007 c1403b00
> 9f60: c071c850 c06f8108 00000006 00000006 00000000 c06f73e0 00000000 0000009f
> 9f80: c0558560 00000000 c0558560 00000000 00000000 00000000 00000000 00000000
> 9fa0: 00000000 c0558570 00000000 c0008348 00000000 00000000 00000000 00000000
> 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
> [<c02f2194>] (_set_bit) from [<c029d6c0>] (blk_queue_write_cache+0x20/0x5c)
> [<c029d6c0>] (blk_queue_write_cache) from [<c03cd1b8>] (add_mtd_blktrans_dev+0x218/0x3cc)
> [<c03cd1b8>] (add_mtd_blktrans_dev) from [<c03ce474>] (mtdblock_add_mtd+0x60/0x78)
> [<c03ce474>] (mtdblock_add_mtd) from [<c03ccf88>] (blktrans_notify_add+0x3c/0x54)
> [<c03ccf88>] (blktrans_notify_add) from [<c03c7328>] (add_mtd_device+0x3bc/0x5e8)
> [<c03c7328>] (add_mtd_device) from [<c03ca0fc>] (add_mtd_partitions+0xc4/0x16c)
> [<c03ca0fc>] (add_mtd_partitions) from [<c03c9f90>] (parse_mtd_partitions+0x370/0x418)
> [<c03c9f90>] (parse_mtd_partitions) from [<c03c7694>] (mtd_device_parse_register+0x74/0x2c4)
> [<c03c7694>] (mtd_device_parse_register) from [<c03dc4a0>] (physmap_flash_probe+0x5e8/0x808)
> [<c03dc4a0>] (physmap_flash_probe) from [<c037b898>] (platform_probe+0x5c/0xbc)
> [<c037b898>] (platform_probe) from [<c03796fc>] (really_probe+0xf8/0x4e8)
> [<c03796fc>] (really_probe) from [<c0379b4c>] (driver_probe_device+0x60/0xb8)
> [<c0379b4c>] (driver_probe_device) from [<c037a0ec>] (device_driver_attach+0xa8/0xb0)
> [<c037a0ec>] (device_driver_attach) from [<c037a17c>] (__driver_attach+0x88/0x11c)
> [<c037a17c>] (__driver_attach) from [<c0377584>] (bus_for_each_dev+0x78/0xc4)
> [<c0377584>] (bus_for_each_dev) from [<c0378a68>] (bus_add_driver+0xe8/0x1d0)
> [<c0378a68>] (bus_add_driver) from [<c037a818>] (driver_register+0x88/0x118)
> [<c037a818>] (driver_register) from [<c00097ac>] (do_one_initcall+0x50/0x1e0)
> [<c00097ac>] (do_one_initcall) from [<c06f8108>] (kernel_init_freeable+0x178/0x200)
> [<c06f8108>] (kernel_init_freeable) from [<c0558570>] (kernel_init+0x10/0x100)
> [<c0558570>] (kernel_init) from [<c0008348>] (ret_from_fork+0x14/0x2c)
> Exception stack(0xc1439fb0 to 0xc1439ff8)
> 9fa0:                                     00000000 00000000 00000000 00000000
> 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> Code: e3a03001 e1a03213 e10fc000 e321f093 (e7912100) 
> ---[ end trace f3b2f52ba3b0d435 ]---
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---
> 
> This happen on 5.13.0-rc6-next-20210615+ on my ARM Gemini ssi1328.

Should be fixed once for-next updates the block branch.

-- 
Jens Axboe