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Date: Mon, 27 Oct 2025 15:07:18 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: "Chen, Yu C" <yu.c.chen@intel.com>
Cc: kernel test robot <oliver.sang@intel.com>,
	Fernand Sieber <sieberf@amazon.com>, oe-lkp@lists.linux.dev,
	lkp@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org,
	aubrey.li@linux.intel.com
Subject: Re: [tip:sched/core] [sched/fair] 79104becf4:
 BUG:kernel_NULL_pointer_dereference,address
Message-ID: <20251027140718.GT1386988@noisy.programming.kicks-ass.net>
References: <202510211205.1e0f5223-lkp@intel.com>
 <20251021110449.GO3245006@noisy.programming.kicks-ass.net>
 <20251027125453.GY4067720@noisy.programming.kicks-ass.net>
 <3b30e40b-f1fb-4145-b4d9-a9279b9602d8@intel.com>
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In-Reply-To: <20251027135516.GA3419281@noisy.programming.kicks-ass.net>

On Mon, Oct 27, 2025 at 02:55:16PM +0100, Peter Zijlstra wrote:

> > May I know if you are using the kernel config 0day attached?
> > I found that the config 0day attached
> > (https://download.01.org/0day-ci/archive/20251021/202510211205.1e0f5223-lkp@intel.com/config-6.18.0-rc1-00001-g79104becf42b)
> > has
> > CONFIG_IA32_EMULATION=y
> > CONFIG_IA32_EMULATION_DEFAULT_DISABLED=y

Yep, deleting that entry makes it all work. You might want to fix the
robot :-)

> > CONFIG_COMPAT_32=y
> > CONFIG_COMPAT=y
> > 
> > It is suspected that the filesystem provided by lkp is 32bits, might
> > need Oliver's confirm.
> 
> It was certainly meant to be that config -- let be double check that.