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

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Message-ID: <87wm7ro3r7.ffs@tglx>
Date: Tue, 29 Jul 2025 09:27:56 +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 Tue, Jul 29 2025 at 08:22, Oliver Sang wrote:
> On Fri, Jul 25, 2025 at 05:45:04PM +0200, Thomas Gleixner wrote:
>> Can you please enable CONFIG_PREEMPT_TRACER and add
>> 
>> 'trace_event=preemptirq:preempt_disable,preemptirq:preempt_enable ftrace_dump_on_oops'
>> 
>> to the kernel command line. The latter will dump the recorded
>> preempt_enable/disable events and we can pinpoint the function which is
>> responsible for that.
>
> the config with CONFIG_PREEMPT_TRACER enabled is attached as
> config-6.16.0-rc5-00002-g56180dd20c19
>
> by this config, we still see random
> WARNING:at_kernel/sched/core.c:#preempt_count_sub
...
> but bot seems not be able to capture other new dmesg stats.

Ah. The tracer does not dump on warnings by default. You need
'panic_on_warn' on the command line as well. Forgot about that earlier.

Thanks,

        tglx