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Date:   Fri, 29 Mar 2019 10:22:50 +0100
From:   Thomas Müller <>
To:     Peter Zijlstra <>
Subject: Re: disabling secondary CPU hangs / system fails to suspend with
 kernel 4.19+


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

View attachment ".config" of type "text/plain" (157627 bytes)

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