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

[Bruno Wolff III]

On Thu, Dec 21, 2017 at 23:31:40 +0800,
 weiping zhang <zwp10758@xxxxxxxxx> wrote:
> does every time boot fail can trigger WANRING in device_add_disk ?

Not that I see. But the message could scroll off the screen. The boot gets 
far enough that systemd copies over dmesg output to permanent storage that 
I can see on my next successful boot. That's where I looked for the warning 
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.

I just tried booting to single user and the boot still hangs.

When I build the kernels, the compiler options are probably a bit different 
than when Fedora does. That might affect what happens during boot.