linux-kernel - Re: Unexplained long boot delays [Was Re: [GIT PULL] RCU changes for v6.9]

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Message-ID: <CAHk-=wgP=9JxdOJ5oYtVO5yM6pFi5+3FPxfCQa4ezpagJuXq3g@mail.gmail.com>
Date: Tue, 12 Mar 2024 14:44:14 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org, 
	kernel-team@...a.com, paulmck@...nel.org, mingo@...nel.org, 
	tglx@...utronix.de, rcu@...r.kernel.org, joel@...lfernandes.org, 
	neeraj.upadhyay@....com, urezki@...il.com, qiang.zhang1211@...il.com, 
	frederic@...nel.org, bigeasy@...utronix.de, anna-maria@...utronix.de, 
	chenzhongjin@...wei.com, yangjihong1@...wei.com, rostedt@...dmis.org
Subject: Re: Unexplained long boot delays [Was Re: [GIT PULL] RCU changes for v6.9]

On Tue, 12 Mar 2024 at 14:34, Florian Fainelli <f.fainelli@...il.com> wrote:
>
> and here is a log where this fails:
>
> https://gist.github.com/ffainelli/ed08a2b3e853f59343786ebd20364fc8

You could try the 'initcall_debug' kernel command line.

It will make the above *much* noisier, but it might - thanks to all
the new noise - show exactly *what* is being crazy slow to initialize.

Because right now it's just radio silence in between those

  [    1.926435] bcmgenet f0480000.ethernet: GENET 5.0 EPHY: 0x0000
  [  162.148135] unimac-mdio unimac-mdio.0: Broadcom UniMAC MDIO bus

things, and that's presumably because some random initcall there just
takes forever to time out.

             Linus