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Subjectatmel_nand: kernel panic when ecc_strength==4
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Hi Boris, Nicolas !

Since commit f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
strange things happen when nand-ecc-strength = <4>; (previously atmel,pmecc-cap).

I first saw that a NULL pointer dereference happened when "udevadm trigger" was launched.
With strace, I nailed it down to :

sh-4.3# echo change > /sys/devices/virtual/bdi/mtd-1/uevent
[ 86.696275] Unable to handle kernel NULL pointer dereference at virtual address 00000001
[ 86.704285] pgd = c717c000
[ 86.707072] [00000001] *pgd=c06d9a7000000000, *pte=00000000, *ppte=00000000
[ 86.713979] Internal error: Oops: 17 [#3] ARM
[ 86.718306] CPU: 0 PID: 1 Comm: sh Tainted: G D W 4.11.0-rc1-00056-gf88fc122cc34-dirty #75
[ 86.727443] Hardware name: Atmel AT91SAM9
[ 86.731424] task: c7880b60 task.stack: c7884000
[ 86.735926] PC is at strlen+0x14/0x2c
[ 86.739556] LR is at kobject_get_path+0x34/0xac
[ 86.744046] pc : [<c023bc08>] lr : [<c0235020>] psr: 20000013
[ 86.744046] sp : c7885dc0 ip : c7885dd0 fp : c7885dcc
[ 86.755439] r10: 00000002 r9 : 00000000 r8 : c7885f78
[ 86.760627] r7 : 014000c0 r6 : c7ab2308 r5 : 00000001 r4 : c7ab2308
[ 86.767106] r3 : 00000001 r2 : 00000001 r1 : 014000c0 r0 : 00000001
[ 86.773588] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 86.780672] Control: 0005317f Table: 2717c000 DAC: 00000051
[ 86.786372] Process sh (pid: 1, stack limit = 0xc7884190)
[ 86.791730] Stack: (0xc7885dc0 to 0xc7886000)
[ 86.796075] 5dc0: c7885df4 c7885dd0 c0235020 c023bc04 c0728bf8 c79f1000 c7ab2308 c78c2b00
[ 86.804195] 5de0: c04f4610 c7885f78 c7885e44 c7885df8 c0236244 c0234ffc c00a53b4 00000074
[ 86.812315] 5e00: 00107000 c7885ea8 c7885e64 c05d604b c717b420 c05b4aa8 0000081f 00000007
[ 86.820438] 5e20: c7ab2300 c7199ea0 c79baae0 c7885f78 c7199eb0 00000007 c7885e54 c7885e48
[ 86.828559] 5e40: c0236640 c0236188 c7885e74 c7885e58 c02a5834 c023663c c7885e9c 00000002
[ 86.836681] 5e60: c7bf1f50 c79baae0 c7885e84 c7885e78 c02a37b8 c02a5800 c7885e9c c7885e88
[ 86.844801] 5e80: c0128fc8 c02a37a0 00000000 00000000 c7885ed4 c7885ea0 c01281e4 c0128f8c
[ 86.852922] 5ea0: 00000000 00000000 c7880b60 c01280b8 00106cf8 c7215c20 c7885f78 00000007
[ 86.861045] 5ec0: c7884000 00106cf8 c7885f44 c7885ed8 c00caec0 c01280c8 0000081f 00107d00
[ 86.869167] 5ee0: c06d0f7c c7885fb0 00053177 00001180 00000178 c7885fac c7885f04 c00091e4
[ 86.877288] 5f00: c001128c c000e088 00000158 c00cb114 000012bc 00000000 bec504d0 b6e8bbec
[ 86.885409] 5f20: c7215c20 c7215c20 00000000 00000007 00106cf8 c7885f78 c7885f74 c7885f48
[ 86.893531] 5f40: c00cb160 c00cae94 c00e6e04 c00e6568 00000000 00000000 c7215c20 c7215c20
[ 86.901652] 5f60: 00000007 00106cf8 c7885fa4 c7885f78 c00cb2dc c00cb0b0 00000000 00000000
[ 86.909773] 5f80: 00000007 00106cf8 b6e8dd50 00000004 c000a544 00000000 00000000 c7885fa8
[ 86.917895] 5fa0: c000a3a0 c00cb2a0 00000007 00106cf8 00000001 00106cf8 00000007 00000000
[ 86.926015] 5fc0: 00000007 00106cf8 b6e8dd50 00000004 00000007 00000004 00000000 000e9124
[ 86.934139] 5fe0: 00000000 bec50a3c b6db63d0 b6e107ac 60000010 00000001 ffffffff ffffffff
[ 86.942277] [<c023bc08>] (strlen) from [<c0235020>] (kobject_get_path+0x34/0xac)
[ 86.949620] [<c0235020>] (kobject_get_path) from [<c0236244>] (kobject_uevent_env+0xcc/0x4b4)
[ 86.958083] [<c0236244>] (kobject_uevent_env) from [<c0236640>] (kobject_uevent+0x14/0x18)
[ 86.966287] [<c0236640>] (kobject_uevent) from [<c02a5834>] (uevent_store+0x44/0x64)
[ 86.973987] [<c02a5834>] (uevent_store) from [<c02a37b8>] (dev_attr_store+0x28/0x34)
[ 86.981672] [<c02a37b8>] (dev_attr_store) from [<c0128fc8>] (sysfs_kf_write+0x4c/0x58)
[ 86.989525] [<c0128fc8>] (sysfs_kf_write) from [<c01281e4>] (kernfs_fop_write+0x12c/0x1c4)
[ 86.997737] [<c01281e4>] (kernfs_fop_write) from [<c00caec0>] (__vfs_write+0x3c/0x11c)
[ 87.005596] [<c00caec0>] (__vfs_write) from [<c00cb160>] (vfs_write+0xc0/0x164)
[ 87.012855] [<c00cb160>] (vfs_write) from [<c00cb2dc>] (SyS_write+0x4c/0x8c)
[ 87.019854] [<c00cb2dc>] (SyS_write) from [<c000a3a0>] (ret_fast_syscall+0x0/0x38)
[ 87.027364] Code: e92dd800 e24cb004 e1a03000 e1a02003 (e5d21000)
[ 87.033544] ---[ end trace 29af93c3c072b1f4 ]---
[ 87.039277] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

This is fun because it really doesn't seem to have anything to do with atmel-nand...

I first found that on my custom board, built around an at91sam9g35-cm, but I managed to trigger it
on an at91sam9g35-ek board, with a 4.13.3 kernel.

NB: I couldn't trigger this with ecc-strength = 2

So, here is my configuration:
- at91sam9g35-ek board with the image ftp://www.at91.com/pub/demo/linux4sam_5.6/linux4sam-poky-at91sam9x5ek-5.6.zip
I flashed this image a first time as is, and then I flashed only the rfs with eccType 0xc0902405.

- Kernel 4.13.3 with the quick'n dirty patch:
--- a/arch/arm/boot/dts/at91sam9x5cm.dtsi
+++ b/arch/arm/boot/dts/at91sam9x5cm.dtsi
@@ -56,7 +56,7 @@
cs-gpios = <&pioD 4 GPIO_ACTIVE_HIGH>;
nand-bus-width = <8>;
nand-ecc-mode = "hw";
- nand-ecc-strength = <2>;
+ nand-ecc-strength = <4>;
nand-ecc-step-size = <512>;
nand-on-flash-bbt;
label = "atmel_nand";
A minimal defconfig (attached)

To trigger the kernel panic on a 4.13.3 kernel:

At uboot:
setenv bootargs $bootargs init=/bin/sh
tftpboot 0x22000000 zImage ; tftpboot 0x21000000 at91sam9g35ek.dtb
bootz 0x22000000 - 0x21000000
mount -tsysfs none /sys
mount -tproc none /proc

echo "change" > /sys/devices/platform/leds/leds/pd21/uevent
[ 21.130000] Unable to handle kernel NULL pointer dereference at virtual address 00000001
[ 21.140000] pgd = c7170000
[ 21.140000] [00000001] *pgd=c06f780000000000, *pte=60000013, *ppte=60000013
[ 21.150000] Internal error: Oops: 17 [#1] ARM
[ 21.150000] CPU: 0 PID: 1 Comm: sh Not tainted 4.13.3-dirty #77
[ 21.150000] Hardware name: Atmel AT91SAM9
[ 21.150000] task: c787c800 task.stack: c78c2000
[ 21.150000] PC is at strlen+0x14/0x2c
[ 21.150000] LR is at kobject_get_path+0x34/0xac
[ 21.150000] pc : [<c04d172c>] lr : [<c04c7444>] psr: 20000013
[ 21.150000] sp : c78c3d90 ip : c78c3da0 fp : c78c3d9c
[ 21.150000] r10: 00000002 r9 : c78c3e28 r8 : c7bdd408
[ 21.150000] r7 : 014000c0 r6 : c7bdd408 r5 : 00000001 r4 : c7bdd408
[ 21.150000] r3 : 00000001 r2 : 00000001 r1 : 014000c0 r0 : 00000001
[ 21.150000] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 21.150000] Control: 0005317f Table: 27170000 DAC: 00000051
[ 21.150000] Process sh (pid: 1, stack limit = 0xc78c2190)
[ 21.150000] Stack: (0xc78c3d90 to 0xc78c4000)
[ 21.150000] 3d80: c78c3dc4 c78c3da0 c04c7444 c04d1728
[ 21.150000] 3da0: c0747de8 c7995000 c7bdd408 c787fac0 c05087c4 c7bdd408 c78c3e14 c78c3dc8
[ 21.150000] 3dc0: c04c8630 c04c7420 c00b0ad8 c78c3e4c 0007c000 c78c3e28 c78c3e4c c05ee954
[ 21.150000] 3de0: 27e1718f c05fbcf7 00000000 00000000 00000007 00000006 00000002 c7bdd408
[ 21.150000] 3e00: c05ee954 c713d0c0 c78c3e5c c78c3e18 c04c8b08 c04c8574 c00c5d58 c00c5600
[ 21.150000] 3e20: c78c3e2c c0521e9c c060f2f7 00000000 c00b6168 00000007 c7bdd400 c7160320
[ 21.150000] 3e40: c713d0c0 c78c3f78 c7160330 00000007 c78c3e74 c78c3e60 c02a102c c04c8a44
[ 21.150000] 3e60: c7034dc0 c713d0c0 c78c3e84 c78c3e78 c029efb8 c02a1010 c78c3e9c c78c3e88
[ 21.150000] 3e80: c012b194 c029efa0 00000000 00000000 c78c3ed4 c78c3ea0 c012a3c8 c012b158
[ 21.150000] 3ea0: 00000000 00000000 0000000f c012a27c 00100f40 c7b82ea0 c78c3f78 00000007
[ 21.150000] 3ec0: c78c2000 00100f40 c78c3f44 c78c3ed8 c00cca24 c012a28c 00001000 00000000
[ 21.150000] 3ee0: 00001000 00000000 00000000 00000000 00000015 07d4a7e8 00000015 0727b420
[ 21.150000] 3f00: 00000015 0727b420 0000148c c00ccc8c be9854d0 b6f74bec c78c3fa4 c78c3f28
[ 21.150000] 3f20: c7b82ea0 c7b82ea0 00000000 00000007 00100f40 c78c3f78 c78c3f74 c78c3f48
[ 21.150000] 3f40: c00cccd8 c00cc9f8 c00e8e48 c00e85ac 00000000 00000000 c7b82ea0 c7b82ea0
[ 21.150000] 3f60: 00000007 00100f40 c78c3fa4 c78c3f78 c00cce54 c00ccc28 00000000 00000000
[ 21.150000] 3f80: 00000007 00100f40 b6f76d50 00000004 c000a544 00000000 00000000 c78c3fa8
[ 21.150000] 3fa0: c000a3a0 c00cce18 00000007 00100f40 00000001 00100f40 00000007 00000000
[ 21.150000] 3fc0: 00000007 00100f40 b6f76d50 00000004 00000007 00000004 00000000 000e9124
[ 21.150000] 3fe0: 00000000 be985a3c b6e9f3d0 b6ef97ac 60000010 00000001 00000000 01010000
[ 21.150000] [<c04d172c>] (strlen) from [<c04c7444>] (kobject_get_path+0x34/0xac)
[ 21.150000] [<c04c7444>] (kobject_get_path) from [<c04c8630>] (kobject_uevent_env+0xcc/0x4b8)
[ 21.150000] [<c04c8630>] (kobject_uevent_env) from [<c04c8b08>] (kobject_synth_uevent+0xd4/0x33c)
[ 21.150000] [<c04c8b08>] (kobject_synth_uevent) from [<c02a102c>] (uevent_store+0x2c/0x4c)
[ 21.150000] [<c02a102c>] (uevent_store) from [<c029efb8>] (dev_attr_store+0x28/0x34)
[ 21.150000] [<c029efb8>] (dev_attr_store) from [<c012b194>] (sysfs_kf_write+0x4c/0x58)
[ 21.150000] [<c012b194>] (sysfs_kf_write) from [<c012a3c8>] (kernfs_fop_write+0x14c/0x1bc)
[ 21.150000] [<c012a3c8>] (kernfs_fop_write) from [<c00cca24>] (__vfs_write+0x3c/0x130)
[ 21.150000] [<c00cca24>] (__vfs_write) from [<c00cccd8>] (vfs_write+0xc0/0x164)
[ 21.150000] [<c00cccd8>] (vfs_write) from [<c00cce54>] (SyS_write+0x4c/0x8c)
[ 21.150000] [<c00cce54>] (SyS_write) from [<c000a3a0>] (ret_fast_syscall+0x0/0x38)
[ 21.150000] Code: e92dd800 e24cb004 e1a03000 e1a02003 (e5d21000)
[ 21.480000] ---[ end trace 3cc39b52c074a44c ]---
[ 21.490000] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

Or, we can just launch udev:
udevd -d
udevadm trigger
(udevadm actually writes "changes" in uevent files).

Now, a fun fact: If we add CONFIG_PM, there's no more kernel panic. (wtf?!)

I also tried to boot with a nfs-root, echo changed > ".../uevent", no kernel panic.
Then, ubiattach the mtd partition, echo changed > ".../uevent" => PANIC !
So, it really seems to be nand-related.

Any idea ?


Richard.
CONFIG_KERNEL_LZO=y
CONFIG_DEFAULT_HOSTNAME=""
# CONFIG_SWAP is not set
CONFIG_SYSVIPC=y
CONFIG_NO_HZ_IDLE=y
CONFIG_BSD_PROCESS_ACCT=y
CONFIG_BSD_PROCESS_ACCT_V3=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_KALLSYMS_ALL=y
CONFIG_EMBEDDED=y
CONFIG_SLAB=y
# CONFIG_IOSCHED_DEADLINE is not set
# CONFIG_IOSCHED_CFQ is not set
# CONFIG_MQ_IOSCHED_DEADLINE is not set
# CONFIG_MQ_IOSCHED_KYBER is not set
# CONFIG_ARCH_MULTI_V7 is not set
CONFIG_ARCH_AT91=y
CONFIG_SOC_AT91SAM9=y
CONFIG_AEABI=y
CONFIG_UACCESS_WITH_MEMCPY=y
# CONFIG_ATAGS is not set
# CONFIG_COREDUMP is not set
# CONFIG_SUSPEND is not set
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_PACKET_DIAG=y
CONFIG_UNIX=y
CONFIG_UNIX_DIAG=y
CONFIG_XFRM_USER=y
CONFIG_NET_KEY=y
CONFIG_INET=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_IP_ROUTE_VERBOSE=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_INET_AH=y
CONFIG_INET_ESP=y
CONFIG_INET_IPCOMP=y
CONFIG_INET_UDP_DIAG=y
# CONFIG_IPV6 is not set
CONFIG_NETLINK_DIAG=y
# CONFIG_WIRELESS is not set
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
# CONFIG_FIRMWARE_IN_KERNEL is not set
CONFIG_MTD=y
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_NAND=y
CONFIG_MTD_NAND_ATMEL=y
CONFIG_MTD_UBI=y
CONFIG_MTD_UBI_FASTMAP=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=4
CONFIG_BLK_DEV_RAM_SIZE=8192
CONFIG_NETDEVICES=y
# CONFIG_NET_VENDOR_ALACRITECH is not set
# CONFIG_NET_VENDOR_AMAZON is not set
# CONFIG_NET_VENDOR_AQUANTIA is not set
# CONFIG_NET_VENDOR_ARC is not set
CONFIG_MACB=y
# CONFIG_NET_VENDOR_BROADCOM is not set
# CONFIG_NET_VENDOR_CIRRUS is not set
# CONFIG_NET_VENDOR_EZCHIP is not set
# CONFIG_NET_VENDOR_FARADAY is not set
# CONFIG_NET_VENDOR_HISILICON is not set
# CONFIG_NET_VENDOR_INTEL is not set
# CONFIG_NET_VENDOR_MARVELL is not set
# CONFIG_NET_VENDOR_MICREL is not set
# CONFIG_NET_VENDOR_NATSEMI is not set
# CONFIG_NET_VENDOR_NETRONOME is not set
# CONFIG_NET_VENDOR_QUALCOMM is not set
# CONFIG_NET_VENDOR_RENESAS is not set
# CONFIG_NET_VENDOR_ROCKER is not set
# CONFIG_NET_VENDOR_SAMSUNG is not set
# CONFIG_NET_VENDOR_SEEQ is not set
# CONFIG_NET_VENDOR_SOLARFLARE is not set
# CONFIG_NET_VENDOR_SMSC is not set
# CONFIG_NET_VENDOR_STMICRO is not set
# CONFIG_NET_VENDOR_VIA is not set
# CONFIG_NET_VENDOR_WIZNET is not set
# CONFIG_NET_VENDOR_SYNOPSYS is not set
CONFIG_DAVICOM_PHY=y
# CONFIG_WLAN is not set
# CONFIG_INPUT_KEYBOARD is not set
# CONFIG_INPUT_MOUSE is not set
# CONFIG_SERIO is not set
CONFIG_VT_HW_CONSOLE_BINDING=y
# CONFIG_LEGACY_PTYS is not set
CONFIG_SERIAL_ATMEL=y
CONFIG_SERIAL_ATMEL_CONSOLE=y
# CONFIG_SERIAL_ATMEL_PDC is not set
# CONFIG_HW_RANDOM is not set
# CONFIG_PTP_1588_CLOCK is not set
CONFIG_GPIO_SYSFS=y
# CONFIG_HWMON is not set
# CONFIG_HID is not set
# CONFIG_USB_SUPPORT is not set
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=y
CONFIG_LEDS_GPIO=y
# CONFIG_IOMMU_SUPPORT is not set
CONFIG_FANOTIFY=y
CONFIG_TMPFS=y
CONFIG_CONFIGFS_FS=y
CONFIG_UBIFS_FS=y
CONFIG_UBIFS_FS_ADVANCED_COMPR=y
# CONFIG_UBIFS_FS_ZLIB is not set
# CONFIG_UBIFS_FS_SECURITY is not set
CONFIG_NFS_FS=y
# CONFIG_NFS_V2 is not set
CONFIG_ROOT_NFS=y
CONFIG_PRINTK_TIME=y
CONFIG_CONSOLE_LOGLEVEL_DEFAULT=8
CONFIG_STRIP_ASM_SYMS=y
CONFIG_DEBUG_SECTION_MISMATCH=y
CONFIG_MAGIC_SYSRQ=y
# CONFIG_SCHED_DEBUG is not set
# CONFIG_DEBUG_BUGVERBOSE is not set
CONFIG_FUNCTION_TRACER=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_TRACER_SNAPSHOT=y
# CONFIG_CRYPTO_MANAGER_DISABLE_TESTS is not set
# CONFIG_CRYPTO_HW is not set
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