netdev - RE: Deadlock with restart

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Message-ID: <681500CE65202E47A192754B01DAB4673BE3D882C7@SDE12.beckipc.net>
Date:   Mon, 30 Jul 2018 10:08:46 +0200
From:   André Pribil <a.pribil@...k-ipc.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Deadlock with restart_syscall()

> Don't do control operations from RT processes!
> There can be cases of priority inversion where RT process is waiting
> for
> something that requires a kthread to complete the operation.

I have RT throttling activated and I thought it would kick-in and give 
the non-RT threads some time to execute.
Therefore, I would expect this control operation to terminate sooner or later, 
even if there's a kthread involved and a priority inversion occurs here, 
but this seems not to be the case. 

Andre