Re: [PATCH RESEND 5/5] block: validate user space vectors during extraction

Cc+: 0wnerD1ed

On Jul 20, 2026 / 13:10, Keith Busch wrote:
> From: Keith Busch <[email protected]>
> 
> The bio-based drivers don't necessarily check the alignment split, and
> stacking block drivers don't always handle a misalignment detected after
> submitting the bio. Validate user vectors against the device's
> dma_alignment as the bio is built from the iov_iter, rejecting
> misaligned early with -EINVAL.

Recently, the new test case block/045 was added to blkests through a GitHub PR
[1]. The test case passes with the Linux master branch tags v7.2-rcX. Today, I
found that it fails with block/for-next branch tip [2]. I bisected and found
that this patch triggers the failure.

0wnerDied, Keith, may I ask your help to resolve the failure? I'm guessing
the test case needs to care device's dma alignment, but not so sure.


[1] https://github.com/linux-blktests/blktests/pull/251

[2] failure log of block/045

block/045 (test direct I/O full-trim bvec alignment)         [failed]
    runtime  0.550s  ...  0.630s
    --- tests/block/045.out     2026-08-03 19:26:40.407053612 +0900
    +++ /home/shin/Blktests/blktests/results/nodev/block/045.out.bad    2026-08-05 20:48:33.366932845 +0900
    @@ -1,2 +1,4 @@
     Running block/045
    +bio-full-trim: pread returned -1 (errno 22)
    +bio-full-trim helper failed
     Test complete
block/045 (zoned) (test direct I/O full-trim bvec alignment) [failed]
    runtime  0.578s  ...  0.636s
    --- tests/block/045.out     2026-08-03 19:26:40.407053612 +0900
    +++ /home/shin/Blktests/blktests/results/nodev_zoned/block/045.out.bad      2026-08-05 20:48:34.550929436 +0900
    @@ -1,2 +1,4 @@
     Running block/045
    +bio-full-trim: pread returned -1 (errno 22)
    +bio-full-trim helper failed
     Test complete