Re: [PATCH 5.10 000/406] 5.10.195-rc1 review

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Sep 19, 2023 at 09:57:25PM -0700, Guenter Roeck wrote:
> On 9/17/23 12:07, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 5.10.195 release.
> > There are 406 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> > 
> > Responses should be made by Tue, 19 Sep 2023 19:10:04 +0000.
> > Anything received after that time might be too late.
> > 
> 
> chromeos-5.10 locks up in configfs_lookup() after the merge of v5.10.195.
> 
> I am a bit puzzled because I see
> 
> c709c7ca020a configfs: fix a race in configfs_lookup()
> 
> in v5.10.195 but not in the list of commits below. I guess I must be
> missing something.

It was part of the big patchset, it was posted here:
	https://lore.kernel.org/r/20230917191101.511939651@linuxfoundation.org

Not hidden at all :)

and was submitted here:
	https://lore.kernel.org/r/ZPOZFHHA0abVmGx+@westworld

> Either case, the code now looks as follows.
> 
> configfs_lookup()
> {
>     ...
>     spin_lock(&configfs_dirent_lock);
>     ...
>         err = configfs_attach_attr(sd, dentry);
>     ...
>     spin_unlock(&configfs_dirent_lock);
>     ...
> }
> 
> and
> 
> configfs_attach_attr(...)
> {
>     ...
>     spin_lock(&configfs_dirent_lock);
>     ...
> }
> 
> which unless it is way too late here and I really need to go to sleep
> just won't work.

Kyle, you did the backport, any comments?

thanks,

greg k-h