linux-kernel - Re: [PATCH v1] kasan,mm: fix incomplete tag reset in change_memory

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Message-ID: <176790294571.2289790.2180517635826904022.b4-ty@arm.com>
Date: Thu, 8 Jan 2026 20:13:11 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: kasan-dev@...glegroups.com, andreyknvl@...il.com,
	Jiayuan Chen <jiayuan.chen@...ux.dev>
Cc: dvyukov@...gle.com, vincenzo.frascino@....com, ryabinin.a.a@...il.com,
	glider@...gle.com, linux-mm@...ck.org,
	Jiayuan Chen <jiayuan.chen@...pee.com>,
	Will Deacon <will@...nel.org>, Ryan Roberts <ryan.roberts@....com>,
	Dev Jain <dev.jain@....com>, Yang Shi <yang@...amperecomputing.com>,
	Kevin Brodsky <kevin.brodsky@....com>,
	Huang Shijie <shijie@...amperecomputing.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: Re: [PATCH v1] kasan,mm: fix incomplete tag reset in
 change_memory_common()

(for some reason, I did not get this email, our server dropped it;
thanks to Will for telling me)

On Sun, 04 Jan 2026 20:35:27 +0800, Jiayuan Chen wrote:
> Running KASAN KUnit tests with {HW,SW}_TAGS mode triggers a fault in
> change_memory_common():
> 
>   Call trace:
>    change_memory_common+0x168/0x210 (P)
>    set_memory_ro+0x20/0x48
>    vmalloc_helpers_tags+0xe8/0x338
>    kunit_try_run_case+0x74/0x188
>    kunit_generic_run_threadfn_adapter+0x30/0x70
>    kthread+0x11c/0x200
>    ret_from_fork+0x10/0x20
>   ---[ end trace 0000000000000000 ]---
>       # vmalloc_helpers_tags: try faulted
>       not ok 67 vmalloc_helpers_tags
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] kasan,mm: fix incomplete tag reset in change_memory_common()
      https://git.kernel.org/arm64/c/5fcd5513072b

-- 
Catalin