From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B47214AA3FD for ; Mon, 7 Sep 2026 12:42:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788784938; cv=none; b=Iv1ARuL7TrS0hIDN0FcqBpul3sN+kdhmv9uDdWJMiTWRp2/SBp6gT0IjdJikn/LSQy6EyckF3rsRqasAUfpt8jvWQQeAVWtf74tfzuDBuVNThyj70bcjB7zfuCRRYe1K9Ka7cUMB5ybGj5yYcgFqYnxYyQ2+lStDUPTg4R7w//4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788784938; c=relaxed/simple; bh=0oseBMeOQONsJgzPttcXame7U4WxMt2ROrwkW7doPFg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=fDkSmA+csE3Dw6Qn2v1qKWGami1p391rs/Um0DbAhNtWfZ+GQMqfcVFkLPxumvG740DJToD6MXnnLvZPmbJ54DkvGUqUAnrZQUFuLaPjJksMDZn6o5a72WOnw9y0pddzavYRLOz/cEIj4KtuhmBcsL7i7sGEf4Hg5GnEHamizDQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BN062EFB; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BN062EFB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DDDD91F00A3A; Mon, 7 Sep 2026 12:42:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788784932; bh=HfMjjI2/7Y+3s7ee+yLarkRTyl6EkYifeRjlYtTl9Y8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=BN062EFBvF2RtBvaF2jcb9/4wctMQKXTnIVyY+FSkPOpdWwfOAtcGub+ZYo6hRNnC uy/uQ/qMVG3Z/v4x/XFEMNJ51/MquyVxc5UoBSux4eqRB/gzl4tA1P2KSNrxetjcNi aBLy0Htl8EZAlZyhf4Ly9gbsBRWSZLsrCBPwVs59igbx3sv6vtl4mAxYvw4YqbwopJ czVe9Ogk1g4l1NAVXW++p3A5Z94J65+41Ma5rHiKdqE5/3jVjl+OA5Skjt/FekcW+t cXZ3Iu9R2IvivAMx3yRFKMqGJJwFU7IhUy6yHCgSsa/Ki5EEQ6ThBXeJdiqqmB3FOU dkVYKulSnFvJw== Message-ID: <1ecffc76-55da-4831-8f21-04c97ce90ec8@kernel.org> Date: Mon, 7 Sep 2026 14:42:06 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] tools/mm: add hwpoison-panic tool To: Andrew Morton , Breno Leitao Cc: Miaohe Lin , Naoya Horiguchi , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , SJ Park , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, kernel-team@meta.com References: <20260803-memory_failure_rewrite_test-v2-1-ed020ce42129@debian.org> <20260829193758.b251f3c89f8201bdc585a305@linux-foundation.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/30/26 04:37, Andrew Morton wrote: > On Mon, 03 Aug 2026 04:31:20 -0700 Breno Leitao wrote: > >> Add a tool that enables the vm.panic_on_unrecoverable_memory_failure >> sysctl, picks a kernel-owned PFN and writes its physical address to >> hard_offline_page. Three page kinds are selectable with -k: rodata >> (default), slab or pgtable. In all cases the host should panic. >> >> Example: >> >> # ./hwpoison-panic -k slab --yes-panic-my-kernel >> injecting hwpoison at phys 0x100032000 (pfn 0x100032, kind=slab) >> expecting kernel panic: 'Memory failure: : unrecoverable page' >> >> In dmesg, you will see: >> >> Memory failure: 0x100032: unhandlable page. >> Memory failure: 0x100032: recovery action for reserved kernel page: Ignored >> Kernel panic - not syncing: Memory failure: 0x100032: unrecoverable page >> >> This lives in tools/mm rather than selftests/mm because every successful >> run crashes the machine, which is not something to run from CI. > > I wonder if we can fix this. Add a knob which tells the kernel not to > panic/oops/crash/etc. Instead it sends a message "i tried to crash but > you told me not to" and proceeds. > > Set that knob around your hwpoison-panic tool and voila, it's now a > selftest. We just shot down a random "kernel-owned PFN" (marking it hwpoison etc). That's really not something you want to do from a selftest. You'd need some kind of hwpoison simulation mode. -- Cheers, David