linux-kernel - Re: disabling secondary CPU hangs / system fails to suspend with kernel 4.19+

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Message-ID: <20190318115728.GP6058@hirez.programming.kicks-ass.net>
Date:   Mon, 18 Mar 2019 12:57:28 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Müller <thomas@...htm.de>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: disabling secondary CPU hangs / system fails to suspend with
 kernel 4.19+

On Fri, Mar 15, 2019 at 09:21:02PM +0100, Thomas Müller wrote:
> I've just re-tested with runlevel 3.
> Not a real VGA console, but at least no Wayland or Gnome to interfere...
> 
> `echo 0 > /sys/...` just blocks and no message whatsoever is visible in dmesg.
> 
> I've executed `echo 0 > ...` in the background to keep my console functional and I can e.g. echo
> something to /dev/kmsg and it shows up, so reading/updating the log buffer appears to be working
> just fine.

Damn.. Thanks for trying. I'll see if I can come up with something, but
I'm out of idea for now :/