linux-kernel - Re: [PATCH v2 1/1] hung_task: fix warnings caused by unaligned lock pointers

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Message-ID: <20251014111125.731ab016@pumpkin>
Date: Tue, 14 Oct 2025 11:11:25 +0100
From: David Laight <david.laight.linux@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Lance Yang
 <lance.yang@...ux.dev>, Eero Tamminen <oak@...sinkinet.fi>, Kent Overstreet
 <kent.overstreet@...ux.dev>, amaindex@...look.com,
 anna.schumaker@...cle.com, boqun.feng@...il.com, ioworker0@...il.com,
 joel.granados@...nel.org, jstultz@...gle.com, leonylgao@...cent.com,
 linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
 longman@...hat.com, mhiramat@...nel.org, mingo@...hat.com,
 mingzhe.yang@...com, peterz@...radead.org, rostedt@...dmis.org, Finn Thain
 <fthain@...ux-m68k.org>, senozhatsky@...omium.org, tfiga@...omium.org,
 will@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/1] hung_task: fix warnings caused by unaligned lock
 pointers

On Thu, 9 Oct 2025 09:11:06 +0200
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> Hi Andrew,
> 
> On Thu, 9 Oct 2025 at 06:04, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > On Thu, 9 Oct 2025 10:01:18 +0800 Lance Yang <lance.yang@...ux.dev> wrote:  
> > > I think we fundamentally disagree on whether this fix for known
> > > false-positive warnings is needed for -stable.  
> >
> > Having the kernel send scary warnings to our users is really bad
> > behavior.  And if we don't fix it, people will keep reporting it.  
> 
> As the issue is present in v6.16 and v6.17, I think that warrants -stable.
> 
> > And removing a WARN_ON is a perfectly good way of fixing it.  The
> > kernel has 19,000 WARNs, probably seven of which are useful :(  
> 
> Right. And there is panic_on_warn...

Which, like panic_on_oops, panics before syslogd has a chance to write
the error message to /var/log/kernel.
Both are set in some environments.

Tracking down those crashes is a right PITA.

	David

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
>