Re: Regression with a0747a859ef6 ("bdi: add error handle for bdi_debug_register")

From: Bruno Wolff III
Date: Thu Dec 21 2017 - 13:18:20 EST

On Thu, Dec 21, 2017 at 10:02:15 -0700,
Jens Axboe <axboe@xxxxxxxxx> wrote:
On 12/21/17 9:42 AM, Bruno Wolff III wrote:
On Thu, Dec 21, 2017 at 23:48:19 +0800,
weiping zhang <zwp10758@xxxxxxxxx> wrote:
output you want. I never saw it for any kernels I compiled myself. Only when
I test kernels built by Fedora do I see it.
see it every boot ?

I don't look every boot. The warning gets scrolled of the screen. Once I see
the CPU hang warnings I know the boot is failing. I don't always look
at journalctl later to see what's there.

I'm going to revert a0747a859ef6 for now, since we're now 8 days into this
and no progress has been made on fixing it.

One important thing I have just found is that it looks like the problem only happens when booting in enforcing mode. If I boot in permissive mode it does not happen. My home machines are currently set to boot in permissive mode and I'll test this evening to see if I can reproduce the problem if I change them to enforcing mode. If so I'll be able to do lots of testing during my vacation.