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Tue, 10 Dec 2024 10:57:00 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 mail3.candelatech.com 2C4AA13C2B1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=candelatech.com; s=default; t=1733857020; bh=7JN1ip0ZnnglVsxW2IDoPTTy2fJtNriHVLdpJGUPuWc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=TXiCOse+IBAqhG3eXlnw4225a5afvpt4VNn7HqjcOa4P3wUfpHGaNKzpqDU7XjtKv FyPeImaAYzkOoJ3CVhFO9KiESM0APJntZE4n+/BwBXn9w3ZCSbdFxpD2J+u0xjjrnN jgUfxzntU0XyAoh4HO2EmJOObW9Gu2uDPqcLYkJ4= Message-ID: <00d8ba74-7661-e6ac-8a67-7af1df0f2f0a@candelatech.com> Date: Tue, 10 Dec 2024 10:56:59 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [PATCH v2] mm/alloc_tag: Add kasan_alloc_module_shadow when CONFIS_KASAN_VMALLOC disabled Content-Language: en-US To: Suren Baghdasaryan , Hao Ge Cc: kent.overstreet@linux.dev, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hao Ge References: <20241210041515.765569-1-hao.ge@linux.dev> <20241210065304.781620-1-hao.ge@linux.dev> From: Ben Greear Organization: Candela Technologies In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-MDID: 1733857091-9qi64w4nqN4w X-MDID-O: us5;ut7;1733857091;9qi64w4nqN4w;;536d06e365f87d56c7a5ab8c2fd573cd X-PPE-TRUSTED: V=1;DIR=OUT; X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 74E901C0004 X-Stat-Signature: eh73od9ymzmxtcynadwuo8u95dx7tmna X-HE-Tag: 1733857071-326338 X-HE-Meta: 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 f3cbna1l qdsXfKGqJedrptb3ltKjXZlBFVqBzIY07nSPU9asy+G4jeR2QLoFaK7RTxYuhRI8cl61KmueT5yvpVYUxcSYNIMd7fcik8Db3XiQVMMoGb9kBVyJefWwuWYFdPx9HcfbJEiyPvSP/p7XeapyF9I92akXBo73NtqscPT7p++0GDMZK860amFT30Rs+KDuz0QYCfwgu5CWS0/9z7Ezptx+ruQv+U1ac1e5JrqninIo1T02k3Gpk6gZR/eqG5c00GuP+62J/hbM0CfmmfwsIWAWd/UmkTNKXIFqqWrWBwjhOpqIKDbaHRCCjg3amBdes/1J6ITRKON6uup5ZskIi61YbrPSkYbyMPhcpl1vKTEhpo8pEtzPgSFBYSOOeqdZF3l24T4J6gezbPYdGM9r+QxT8ieq1Eol664X5SaiAS3BcMrA16pqz/lQhzWYF92PfNlPbKAJ9yJv+iQDXbIk= X-Bogosity: Unsure, tests=bogofilter, spamicity=0.497574, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 12/10/24 09:55, Suren Baghdasaryan wrote: > On Mon, Dec 9, 2024 at 10:53 PM Hao Ge wrote: >> >> From: Hao Ge >> >> When CONFIG_KASAN is enabled but CONFIG_KASAN_VMALLOC >> is not enabled, we may encounter a panic during system boot. >> >> Because we haven't allocated pages and created mappings >> for the shadow memory corresponding to module_tags region, >> similar to how it is done for execmem_vmalloc. >> >> The difference is that our module_tags are allocated on demand, >> so similarly,we also need to allocate shadow memory regions on demand. >> However, we still need to adhere to the MODULE_ALIGN principle. Hello, I applied this patch: https://lore.kernel.org/all/20241130001423.1114965-1-surenb@google.com/raw as well as the v2 patch in this email thread, on top of today's Linus kernel (plus local patches that should be un-related to this particular issue) and now my system boots when my current mix of kernel debugging is enabled. Thanks for the fix! --Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com