Re: [PATCH 5.10 000/294] 5.10.215-rc1 review

[Greg Kroah-Hartman]

On Sun, Apr 14, 2024 at 02:18:03PM -0700, Guenter Roeck wrote:
> Hi Greg,
> 
> On Sun, Apr 14, 2024 at 08:09:39AM +0200, Greg Kroah-Hartman wrote:
> > On Sat, Apr 13, 2024 at 07:11:57AM -0700, Guenter Roeck wrote:
> > > Hi,
> > > 
> > > On Thu, Apr 11, 2024 at 11:52:43AM +0200, Greg Kroah-Hartman wrote:
> > > > This is the start of the stable review cycle for the 5.10.215 release.
> > > > There are 294 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 Sat, 13 Apr 2024 09:53:55 +0000.
> > > > Anything received after that time might be too late.
> > > > 
> > > > The whole patch series can be found in one patch at:
> > > > 	https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.10.215-rc1.gz
> > > > or in the git tree and branch at:
> > > > 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y
> > > > and the diffstat can be found below.
> > > > 
> > > > thanks,
> > > > 
> > > > greg k-h
> > > > 
> > > > -------------
> > > [ ... ]
> > > > 
> > > > Oliver Neukum <oneukum@xxxxxxxx>
> > > >     usb: cdc-wdm: close race between read and workqueue
> > > > 
> > > 
> > > Just in case it has not been reported yet:
> > > 
> > > This patch is causing connection failures (timeouts) on all
> > > Chromebooks using the cdc-wdm driver for cellular modems, with
> > > all kernel branches where this patch has been applied.
> > > Reverting it fixes the problem.
> > > 
> > > I am copying some of the Google employees involved in identifying
> > > the regression in case additional feedback is needed.
> > 
> > Can you all respond to Oliver on the linux-usb list where this was
> > originally submitted to work it out?  This commit has been in the tree
> > for almost a month now with no reported problems that I can see.
> > 
> 
> Who knows, maybe only a certain type of usb cellular modems using cdc-wdm
> is affected. Either case, the problem was found less than two days after
> the stable tree merges into ChromeOS, and it took only about a week from
> there to identify the offending patch. I think that was actually an amazing
> job, given the size of those merges and because the failure is not absolute
> but results in unreliable tests due to timeouts.

It is an amazing job, and I wasn't trying to be snarky, I was trying to
say that "that's odd, normally usb problems are found very quickly by
lots of people and you should let the author know about this as there's
nothing I can do about it through this stable report".

I see the post on linux-usb now, thanks.

greg k-h