linux-kernel - Re: [tip:locking/futex] [futex] 56180dd20c: BUG:sleeping_function_called_from_invalid_context_at

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Message-ID: <aJMT5DsFlOL6V+Nv@xsang-OptiPlex-9020>
Date: Wed, 6 Aug 2025 16:35:48 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Thomas Gleixner <tglx@...utronix.de>
CC: Peter Zijlstra <peterz@...radead.org>, <oe-lkp@...ts.linux.dev>,
	<lkp@...el.com>, <linux-kernel@...r.kernel.org>, <x86@...nel.org>, "Sebastian
 Andrzej Siewior" <bigeasy@...utronix.de>, <linux-mm@...ck.org>,
	<ltp@...ts.linux.it>, <oliver.sang@...el.com>
Subject: Re: [tip:locking/futex] [futex]  56180dd20c:
 BUG:sleeping_function_called_from_invalid_context_at_kernel/nsproxy.c

On Wed, Aug 06, 2025 at 10:19:36AM +0200, Thomas Gleixner wrote:
> Oliver!
> 
> On Wed, Aug 06 2025 at 16:01, Oliver Sang wrote:
> > On Thu, Jul 31, 2025 at 04:03:01PM +0200, Thomas Gleixner wrote:
> >> On Thu, Jul 31 2025 at 14:34, Thomas Gleixner wrote:
> >> > Either you make the timeout longer or try the following on the kernel
> >> > command line instead of 'ftrace_dump_on_cpu':
> >> 
> >>   instead of 'ftrace_dump_ooops'
> >
> > sorry for late, I just took several-day off.
> 
> I hope you had a good time!
> 
> > attached dmesg FYI.
> 
> Thanks for doing this. Now the buffer is too short and as nothing stops
> the tracer the interesting stuff goes out of sight.
> 
> Can you please apply the patch below and try again?

got it!

just want to confirm, still use below params or need some modification?

trace_event=preemptirq:preempt_disable,preemptirq:preempt_enable ftrace_dump_on_oops=orig_cpu trace_buf_size=100K panic_on_warn=1


> 
> Thanks,
> 
>         tglx
> ---
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -5850,6 +5850,8 @@ void preempt_count_sub(int val)
>  	/*
>  	 * Underflow?
>  	 */
> +	if (val > preempt_count())
> +		tracing_off();
>  	if (DEBUG_LOCKS_WARN_ON(val > preempt_count()))
>  		return;
>  	/*