Re: [PATCH v3 bpf-next 1/4] kernfs: remove iattr_mutex

["André Draszik" <andre.draszik@linaro.org>]

Hi,

On Sun, 2025-06-22 at 23:38 -0700, Song Liu wrote:
> From: Christian Brauner <brauner@kernel.org>
> 
> All allocations of struct kernfs_iattrs are serialized through a global
> mutex. Simply do a racy allocation and let the first one win. I bet most
> callers are under inode->i_rwsem anyway and it wouldn't be needed but
> let's not require that.
> 
> Signed-off-by: Christian Brauner <brauner@kernel.org>
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Acked-by: Tejun Heo <tj@kernel.org>
> Signed-off-by: Song Liu <song@kernel.org>

On next-20250701, ls -lA gives errors on /sys:

$ ls -lA /sys/
ls: /sys/: No data available
ls: /sys/kernel: No data available
ls: /sys/power: No data available
ls: /sys/class: No data available
ls: /sys/devices: No data available
ls: /sys/dev: No data available
ls: /sys/hypervisor: No data available
ls: /sys/fs: No data available
ls: /sys/bus: No data available
ls: /sys/firmware: No data available
ls: /sys/block: No data available
ls: /sys/module: No data available
total 0
drwxr-xr-x   2 root root 0 Jan  1  1970 block
drwxr-xr-x  52 root root 0 Jan  1  1970 bus
drwxr-xr-x  88 root root 0 Jan  1  1970 class
drwxr-xr-x   4 root root 0 Jan  1  1970 dev
drwxr-xr-x  11 root root 0 Jan  1  1970 devices
drwxr-xr-x   3 root root 0 Jan  1  1970 firmware
drwxr-xr-x  10 root root 0 Jan  1  1970 fs
drwxr-xr-x   2 root root 0 Jul  2 09:43 hypervisor
drwxr-xr-x  14 root root 0 Jan  1  1970 kernel
drwxr-xr-x 251 root root 0 Jan  1  1970 module
drwxr-xr-x   3 root root 0 Jul  2 09:43 power


and my bisect is pointing to this commit. Simply reverting it also fixes
the errors.


Do you have any suggestions?


Cheers,
Andre'