linux-kernel - Re: [linus:master] [kasan] 3738290bfc: kunit.kasan.fail

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Message-ID: <Z38uSJ0ut2XikMYj@xsang-OptiPlex-9020>
Date: Thu, 9 Jan 2025 10:02:48 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Alexander Potapenko <glider@...gle.com>
CC: Andrey Konovalov <andreyknvl@...il.com>, Marco Elver <elver@...gle.com>,
	Nihar Chaithanya <niharchaithanya@...il.com>, <oe-lkp@...ts.linux.dev>,
	<lkp@...el.com>, <linux-kernel@...r.kernel.org>, Andrew Morton
	<akpm@...ux-foundation.org>, Andrey Ryabinin <ryabinin.a.a@...il.com>,
	"Dmitry Vyukov" <dvyukov@...gle.com>, Shuah Khan <skhan@...uxfoundation.org>,
	<kasan-dev@...glegroups.com>, <oliver.sang@...el.com>
Subject: Re: [linus:master] [kasan] 3738290bfc: kunit.kasan.fail

hi, Alexander Potapenko, hi, Andrey Konovalov,
On Wed, Jan 08, 2025 at 05:17:55PM +0100, Alexander Potapenko wrote:
> On Wed, Jan 8, 2025 at 5:03 PM Andrey Konovalov <andreyknvl@...il.com> wrote:
> >
> 
> > > [  118.348258] CPU: 7 UID: 0 PID: 3613 Comm: kunit_try_catch Tainted: G    B   W        N 6.12.0-rc6-00221-g3738290bfc99 #1
> > > [  118.359770] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST
> > > [  118.365490] Hardware name: Dell Inc. OptiPlex 7050/062KRH, BIOS 1.2.0 12/22/2016
> > > [  118.373542] ==================================================================
> > > [  118.381677]     not ok 4 kmalloc_track_caller_oob_right
> >
> > +Marco and Alexander
> >
> > Looks like KFENCE hijacked the allocation and reported the OOB instead
> > of KASAN. There's a KASAN issue filed for this problem [1], but no
> > solution implemented in the kernel so far.
> 
> If for some reason we want to keep both KFENCE and KASAN enabled on
> that machine, we can use is_kfence_address() to check if an allocation
> in a KASAN test was made from the KFENCE pool, and repeat it. This
> won't look nice though, because we have several different allocation
> APIs in the C test module alone, not to mention Rust.
> 
> > Perhaps, it makes sense to disable KFENCE when running the KASAN test
> > suite on kernel test robot for now?
> 
> Looks like the simplest solution for now.

thanks a lot for information! we will update the bot to do this disable.