Hello,
I am working on a i.MX6UL based board with a 4GB eMMC partitioned as following:
Device Boot Start End Sectors Size Id Type /dev/sdb1 2048 264191 262144 128M 83 Linux /dev/sdb2 264192 4458495 4194304 2G 83 Linux /dev/sdb3 4458496 7634943 3176448 1.5G 83 Linux
On the 2nd partition, I write this ext4 filesystem file generated by Buildroot: Filesystem volume name: "ROOTFS" Last mounted on: <not available> Filesystem UUID: b9833a36-e89d-429a-b120-c3b00bcb7785 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal dir_index filetype extent sparse_super uninit_bg Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Unknown (continue) Filesystem OS type: Linux Inode count: 3456 Block count: 91756 Reserved block count: 4587 Free blocks: 13458 Free inodes: 488 First block: 1 Block size: 1024 Fragment size: 1024 Blocks per group: 7648 Fragments per group: 7648 Inodes per group: 288 Inode blocks per group: 36 Last mount time: n/a Last write time: Tue Nov 29 09:44:52 2016 Mount count: 0 Maximum mount count: -1 Last checked: Tue Nov 29 09:44:52 2016 Check interval: 0 (<none>) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: a583a07f-6b59-442d-8e08-9be305f78d17 Journal backup: inode blocks
This filesystem is written with the following commands:
BIOS> setexpr nbblocks ${filesize} / 0x200 BIOS> setexpr nbblocks ${nbblocks} + 1 BIOS> mmc write ${loadaddr} 0x40800 ${nbblocks} MMC write: dev # 0, block # 264192, count 183513 ... 183513 blocks written: OK
I can boot Linux with it without any issues, however if I try to write a file in it I get the following crash:
BIOS> ext4write mmc 0:2 ${loadaddr} /boot/${kernelimg} ${filesize}
File System is consistent file found, deleting update journal finished File System is consistent update journal finished data abort pc : [<8ff783ac>] lr : [<8ff86c95>] reloc pc : [<8780e3ac>] lr : [<8781cc95>] sp : 8ef696b8 ip : 00000000 fp : 8ffbc6d8 r10: 00000200 r9 : 8ef69ee8 r8 : 8ffbc744 r7 : 8ef9f600 r6 : 8ef999b6 r5 : 00000003 r4 : 8ffa35fc r3 : 8ef999b8 r2 : 00000001 r1 : fffffffe r0 : 8ef999c0 Flags: NzCv IRQs off FIQs off Mode SVC_32 Resetting CPU ...
resetting ...
I have investigated a bit and I found that the crash is in the ext4fs_deinit() function provoked by the free() call at line 722 (fs/ext4/ext4_write.c) and the ext4fs_deinit() is called in ext4fs_write() at line 980.
If I resize the filesystem under Linux, I don't get the crash but the following error:
ext4fs_devread read outside partition 4294967294 error in File System init ** Error ext4fs_write() ** ** Unable to write file /boot/opos6ul-linux.bin **
Any idea ?
Regards,