dd: IO Error: Invalid input

[jmgibson1981]

Ubuntu 25.10. Received this error when trying to create a Debian boot flash drive.

$ sudo dd if=debian-live-13.1.0-amd64-standard.iso of=/dev/sde oflag=direct bs=8M status=progress
dd: IO error: Invalid input

Using gnudd finished normally with the exact same command

$ sudo gnudd if=debian-live-13.1.0-amd64-standard.iso of=/dev/sde oflag=direct bs=8M status=progress

[romanstingler]

The issue I guess is that regular Rust vectors don't guarantee alignment for O_DIRECT operations.
The kernel requires buffers to be aligned to the filesystem block size (typically 4096 bytes).

I could have a look

[mfontanaar]

Is this solved by #9016?

@jmgibson1981 can you check building dd from main?

[mfoliveira]

@mfontanaar

Is this solved by #9016?

Yes, verified below.

Hi @sylvestre . Could you please close this issue? It is fixed by the PR you merged, #9016. Thanks in advance!

Commit:

# git remote get-url origin
https://github.com/uutils/coreutils.git

# git log --oneline -1 bcba02462800b7c369d327aaffd06996009289c1
bcba02462 fix(dd): handle O_DIRECT partial block writes

# git describe --contains bcba02462800b7c369d327aaffd06996009289c1
0.4.0~65^2

Before:

# git checkout bcba02462800b7c369d327aaffd06996009289c1^
# cargo build --features "dd" --no-default-features
# ./target/debug/coreutils dd if=/dev/zero of=/dev/sda count=1 oflag=direct
dd: IO error: Invalid input

After:

# git checkout bcba02462800b7c369d327aaffd06996009289c1
# cargo build --features "dd" --no-default-features
# ./target/debug/coreutils dd if=/dev/zero of=/dev/sda count=1 oflag=direct
1+0 records in
1+0 records out
512 bytes copied, 0.00135132 s, 512 kB/s

Environment:

# lsb_release -rs
25.10

# uname -rv
6.17.0-11-generic #11-Ubuntu SMP PREEMPT_DYNAMIC Sat Dec 20 07:44:31 UTC 2025