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Date: Tue, 12 Nov 2024 23:06:44 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@collabora.com>, Shakeel Butt
 <shakeel.butt@linux.dev>, Kent Overstreet <kent.overstreet@linux.dev>,
 Pasha Tatashin <pasha.tatashin@soleen.com>, <linux-kernel@vger.kernel.org>,
 <linux-arm-kernel@lists.infradead.org>,
 <linux-mediatek@lists.infradead.org>, <catalin.marinas@arm.com>, Casper Li
 <casper.li@mediatek.com>, Chinwen Chang <chinwen.chang@mediatek.com>,
 Andrew Yang <andrew.yang@mediatek.com>, Elena Yu <elena.yu@mediatek.com>,
 <wsd_upstream@mediatek.com>
Subject: Re: [PATCH] sched/task_stack: Fix object_is_on_stack() for KASAN
 tagged pointers
Message-Id: <20241112230644.cfe24aa5e863112de04b16c0@linux-foundation.org>
In-Reply-To: <20241113042544.19095-1-qun-wei.lin@mediatek.com>
References: <20241113042544.19095-1-qun-wei.lin@mediatek.com>
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On Wed, 13 Nov 2024 12:25:43 +0800 Qun-Wei Lin <qun-wei.lin@mediatek.com> wrote:

> When CONFIG_KASAN_SW_TAGS and CONFIG_KASAN_STACK are enabled, the
> object_is_on_stack() function may produce incorrect results due to the
> presence of tags in the obj pointer, while the stack pointer does not
> have tags. This discrepancy can lead to incorrect stack object detection
> and subsequently trigger warnings if CONFIG_DEBUG_OBJECTS is also
> enabled.
> 
> Example of the warning:

Thanks.

Are we able to identify when this started happening?  ie, a suitable
Fixes: taret?