The errors simply mean that ext4 has detected that its metadata has gotten corrupted. How and why it happened is going to vary from situation to situation.
For example, in the case of the original reporter, it was due to him installing ext2fsd, and trying to access the file system from windows. The ext2fsd isn't aware of all of the latest new features in ext4, and worse, it didn't know to check the file system feature bitmaps, and if there is a feature set in the read-only incompat feature set or the incompat feature set which ext2fsd didn't understand, that it should keep its paws off the file system. This caused the checksum failures. In Gerard's case in #8 and #9, it's not clear what the cause might be. Ubuntu 14.04 doesn't ship with e2fsprogs 1.43. So you've updated to a newer version of e2fsprogs; one which is newer than what is supported with Ubuntu 14.04. It's possible that this was due to your using a much older kernel than one that was truly ready to support the metadata checksum feature; so if you are using the ancient Ubuntu 14.04 kernel, that might be the explanation. Or it could be that there is a true hardware problem that you are tripping up against. In any case, this isn't an e2fsprogs bug. It's possible it's a kernel bug, but neither Ubuntu nor the upstream kernel community is going to support the ext4 metadata checksum feature on an ancient Ubuntu 14.04 kernel. If you think your are technically saavy enough to run with an upstream kernel, you could update to a bleeding edge kernel, and then you can ask about ext4 problems on the linux-ext4 mailing list. If you don't think you're ready to go that extreme, it might be for the best if you were to just disable the metadata_csum feature, using "tune2fs -O ^metadata_csum /dev/sdb5" with the file system umounted. You can then disable mke2fs from enabling the metadata_csum feature in the future by editing /etc/mke2fs.conf, and removing metadata_csum from the features list. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1637779 Title: ext4 filesystem fails randomly with checksum error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/1637779/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
