Re: [PATCH v3 15/17] ext4: convert free groups order lists to xarrays

[Guenter Roeck]

On 7/23/25 21:54, Theodore Ts'o wrote:
> On Wed, Jul 23, 2025 at 08:55:14PM -0700, Guenter Roeck wrote:
> > Hi,
> >
> > On Mon, Jul 14, 2025 at 09:03:25PM +0800, Baokun Li wrote:
> > > While traversing the list, holding a spin_lock prevents load_buddy, making
> > > direct use of ext4_try_lock_group impossible. This can lead to a bouncing
> > > scenario where spin_is_locked(grp_A) succeeds, but ext4_try_lock_group()
> > > fails, forcing the list traversal to repeatedly restart from grp_A.
> >
> > This patch causes crashes for pretty much every architecture when
> > running unit tests as part of booting.
>
> I'm assuming that you're using a randconfig that happened to enable
> CONFIG_EXT4_KUNIT_TESTS=y.

I enable as many kunit tests as possible, including CONFIG_EXT4_KUNIT_TESTS=y,
on top of various defconfigs. That results in:
	total: 637 pass: 59 fail: 578
with my qemu boot tests, which in a way is quite impressive ;-).

Guenter