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

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Message-ID: <ab509a07-d597-2925-b39a-f1b4e86e5850@mathtm.de>
Date:   Fri, 29 Mar 2019 10:22:50 +0100
From:   Thomas Müller <thomas@...htm.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: disabling secondary CPU hangs / system fails to suspend with
 kernel 4.19+

Hi,

Am 18.03.19 um 12:57 schrieb Peter Zijlstra:
> 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 :/
>
Any new ideas so far?

For reference:
I've just tested a vanilla 5.0.5 with localmodconfig (attached)... same behavior :(


Best regards
Thomas

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