linux-kernel - Re: commit dd4cf8c9e1f4 leads to failed boot

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Message-ID: <fa8dd394-45c1-48d3-881c-5f3d5422df39@paulmck-laptop>
Date: Wed, 23 Apr 2025 07:18:14 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: "Aithal, Srikanth" <sraithal@....com>
Cc: Bert Karwatzki <spasswolf@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	Mateusz Guzik <mjguzik@...il.com>, Petr Mladek <pmladek@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	linux-kernel@...r.kernel.org,
	Linux-Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: commit dd4cf8c9e1f4 leads to failed boot

On Wed, Apr 23, 2025 at 07:09:42PM +0530, Aithal, Srikanth wrote:
> On 4/23/2025 5:24 PM, Bert Karwatzki wrote:
> > Since linux next-20250422 booting fails on my MSI Alpha 15 Laptop runnning
> > debian sid. When booting kernel message appear on screen but no messages from
> > init (systemd). There are also no logs written even thought emergency sync
> > via magic sysrq works (a message is printed on screen), presumably because
> > / is not mounted. I bisected this (from 6.15-rc3 to next-20250422) and found
> > commit dd4cf8c9e1f4 as the first bad commit.
> > Reverting commit dd4cf8c9e1f4 in next-20250422 fixes the issue.
> 
> 
> Hello,
> 
> On AMD platform as well boot failed starting next-20250422, bisecting the
> issue led me to same commit dd4cf8c9e1f4. I have attached kernel config and
> logs.

Thank you all for the bisection and the report!

Please check out the predecessor of commit dd4cf8c9e1f4 ("ratelimit:
Force re-initialization when rate-limiting re-enabled"):

13fa70e052dd ("ratelimit: Allow zero ->burst to disable ratelimiting")

Then please apply the patch shown below, and let me know what happens?
(Yes, I should have split that commit up...)

							Thanx, Paul

------------------------------------------------------------------------

diff --git a/lib/ratelimit.c b/lib/ratelimit.c
index 04f16b8e24575..13ed636642270 100644
--- a/lib/ratelimit.c
+++ b/lib/ratelimit.c
@@ -35,7 +35,7 @@ int ___ratelimit(struct ratelimit_state *rs, const char *func)
 	unsigned long flags;
 	int ret;
 
-	if (!interval || !burst)
+	if (interval <= 0 || burst <= 0)
 		return 1;
 
 	/*