Re: Please consider 83f99de1b7c0 ("ext2: fix race between setxattr and write back") for 5.10.y, 5.15.y, and 6.1.y

[Michael Bommarito]

On Fri, Jul 10, 2026 at 7:28 AM Theodore Tso <tytso@xxxxxxx> wrote:
> I invite you to figure out a way to figure out an AI mediated tool
> that can attempt the backport, and then run the moral equivalent of
> "gce-xfstests -c ext4.all -g auto" to verify that the backport doesn't
> result in any regressions.  (Some previous attempts to backport to
> older LTS kernels have resulted in the kernels crashing as a result.)

OK, done.  The whole set of scripts and results are in a GH gist at
[1] but the most important part is the subset of relevant fstests (see
ext2-testset.txt in [1]).  Everything was green against the targets I
listed.

branch   variant   pass  fail  notrun  timeout  dmesg   failures
5.10.y   stock       40     0      27        0  clean   -
5.10.y   patched     39     0      27        1  clean   -
5.15.y   stock       39     1      26        1  clean   generic/607
5.15.y   patched     39     1      26        1  clean   generic/607
6.1.y    stock       27     1      38        1  clean   generic/607
6.1.y    patched     27     1      38        1  clean   generic/607

Regression = a test that passes on stock but fails on patched.
  5.10.y: NO NEW FAILURES
  5.15.y: NO NEW FAILURES
  6.1.y : NO NEW FAILURES
OVERALL: PASS. The backport introduces no regressions in the ext2 surface.

If you think I missed any tests or you want to add a fuzzer/syzkaller,
lemme know.

[1] https://gist.github.com/mjbommar/c8ec6b6025d054e453625a06806459fc

Thanks,
Mike