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Date: Mon, 29 Jan 2018 13:37:28 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Wolfgang Walter <linux@stwm.de>
Cc: stable@vger.kernel.org
Subject: Re: NFS: regression in stable kernel 4.9.78 from 4.9.75
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On Mon, Jan 29, 2018 at 01:22:49PM +0100, Wolfgang Walter wrote:
> Hello,
> 
> after upgrading our nfs-server from  4.9.75 to 4.9.78 group permissions stop 
> working (for clients). If you need group permissions to access a file or 
> directory, sometimes access is granted, but rather often denied. Often access 
> to the same object is denied within seconds after access was granted in an 
> earlier access. user permissions work fine.
> 
> Downgrading to 4.9.75 fixes the issue.

Any chance you can use 'git bisect' to find the offending commit?

And also, does 4.14 work properly for you?  4.15?

thanks,

greg k-h