linux-kernel - Re: [Bug] "BUG: soft lockup in unwind_get_return

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Message-ID: <CAP=Rh=MON8RSf7dAAFnYvjCgN703LMtEuDA+QU08Hwrf-snR0w@mail.gmail.com>
Date: Thu, 22 May 2025 23:30:45 +0800
From: John <john.cs.hey@...il.com>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [Bug] "BUG: soft lockup in unwind_get_return_address" in Linux
 kernel v6.15-rc5

Hello Dave,

Thank you very much for your prompt reply and kind support. Based on
your analysis, I will disable KASAN and attempt to reproduce the crash
accordingly.

I will keep you updated with any progress. I truly appreciate your
time and assistance.

Best regards,
John

On Thu, May 22, 2025 at 11:29 PM Dave Hansen <dave.hansen@...el.com> wrote:
>
> On 5/22/25 08:09, John wrote:
> > I am writing to report a potential vulnerability I encountered during
> > testing of the Linux Kernel version v6.15-rc5.
>
> Hi John,
>
> Could you tell us a little more about the overall environment here? It
> seems like you're running syzkaller and just reporting whenever you see
> a splat. Is that about right? Could you tell us a little more about why
> you are doing this? What is your goal?
>
> I think Steve's advice he gave you yesterday applies to this one as well:
>
> > https://lore.kernel.org/all/20250521133137.1b2f2cac@gandalf.local.home/
>
> Feel free to _run_ with KASAN enabled, but please don't report issues
> unless you can reproduce without KASAN. Unless it's an actual KASAN
> error report, of course.
>
> But, in general syzkaller produces a ton of noise. Unless you have a
> reproducer or a _clear_ bug, I'm not sure it's very worth sending these
> reports. There's honestly not much we can do with them.