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

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Message-ID: <87qzxoeuav.ffs@tglx>
Date: Wed, 06 Aug 2025 10:19:36 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Oliver Sang <oliver.sang@...el.com>
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

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?

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;
 	/*