linux-kernel - Re: [paulmck-rcu:dev.2025.08.13a] [tracing] 364ac25d46: WARNING:at_arch/x86/mm/fault.c:#do_user_addr

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Message-ID: <20250903113112.247eb552@batman.local.home>
Date: Wed, 3 Sep 2025 11:31:12 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Oliver Sang <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
 lkp@...el.com, linux-kernel@...r.kernel.org, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>, linux-trace-kernel@...r.kernel.org
Subject: Re: [paulmck-rcu:dev.2025.08.13a] [tracing]  364ac25d46:
 WARNING:at_arch/x86/mm/fault.c:#do_user_addr_fault

On Wed, 3 Sep 2025 03:31:31 -0700
"Paul E. McKenney" <paulmck@...nel.org> wrote:

> > by applying the patch, the issue gone. but since you said this is a 'diagnostic
> > patch', not sure if it's a real fix. anyway:
> > 
> > Tested-by: kernel test robot <oliver.sang@...el.com>  
> 
> Thank you very much!  This tells me that something on the code path from
> the tracepoint to the BPF program needs to have preemption disabled.
> I will leave the diagnostic patch in my tree, and will be looking into
> what the real fix should be.

Was it a BPF program that triggered this? I couldn't get that from the
backtrace. Also, is this only a x86 32bit issue?

-- Steve