lkml.org 
[lkml]   [2022]   [Jun]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Boot stall regression from "printk for 5.19" merge
On Mon, 20 Jun 2022 14:23:28 +0900
Sergey Senozhatsky <senozhatsky@chromium.org> wrote:

> On (22/06/19 20:49), Marek Behún wrote:
> [..]
> > causes a regression on arm64 (Marvell CN9130-CRB board) where the
> > system boot freezes in most cases (and is unusable until restarted by
> > watchdog), or, in some cases boots, but the console output gets mangled
> > for a while (the serial console spits garbage characters).
>
> Can you please try disabling console kthreads and see how the boot
> process goes? Just `return 0` from printk_activate_kthreads() (I think
> this should do the trick).

This indeed makes the problem go away...

>
> > The stall example:
> >
> > ...
> > [ 1.108141] io scheduler mq-deadline registered
> > [ 1.108143] io scheduler kyber registered
> > [ 1.163484] armada-ap806-pinctrl f06f4000.system-controller:pinctrl: registered pinctrl driver
> > [
> >
> > Or another:
> >
> > ...
> > [ 1.108155] io scheduler mq-deadline registered
> > [ 1.108156] io scheduler kyber registered
> > [ 1.162991] armada-ap806-pinctrl f06f4000.system-controller:pinctrl: registered pinctrl driver
> > [ 1.163361] armada-cp110-pinctrl f2440000.system-controller:pinctrl: registered pinctrl driver
> > [ 1.180827] mv_xor_v2 f0400000.xor: Marvell Version 2 XOR driver
> > [
> >
> > The garbage example:
> >
> > ...
> > [ 0.920951] raid6: using neon recovery algorithm
> > [ 0.921228] iommu: Default domain type: Translated
> > %
> >
> > gb@k+cFL/[ 4.954974] DSA: tree 0 setup
> > [ 4.955286] cfg80211: Loading compiled-in X.509 certificates for regulatory database
>
> This is pretty suspicious. I don't see how console kthreads would
> corrupt the output. I suspect that something else is going on, some
> memory corruption, etc.

Maybe multiple threads are writing to serial registers, or something...

Marek

\
 
 \ /
  Last update: 2022-06-20 12:03    [W:0.316 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site