From patchwork Mon Sep 2 03:00:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13786682 Received: from out30-99.freemail.mail.aliyun.com (out30-99.freemail.mail.aliyun.com [115.124.30.99]) (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 3E1B6374C4; Mon, 2 Sep 2024 03:00:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.99 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725246055; cv=none; b=qpvxFKpLA0UofR4AGa+Vre5viO7AkSahfB/yjYAtDJ23q0PFOmx0xe8+sdmW1Mty3JtZi+WD3KxQmKNo94HrKHI43XIqiGJe+Emx35Nnrw1wemVJFvW9iKa5BduCi1XMIe4BhvumHxf4EdokAV67b3W9a8iL/1h3Jseu2fRgb7Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725246055; c=relaxed/simple; bh=sW0MxBA5jG+RRj56ILFMQvMnn7jyh+dJcwKqVHjg+hk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QgjdhJJrUkd1QKpNOkbAXlc9iITeaxoj1zokXEsQLUJYkSaa7FzJmbQ+RwEF4gWMI1eD734W445aV2uFnsHxiFjOq7Wyo0TejQ0xcrkV7ymu7zt4EcrM7M00tQQRS0zzuWQN4ORhziLcU+eP5UFzBfIUE2+spIPVqdFYRYBwFmI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=I+fvNf5D; arc=none smtp.client-ip=115.124.30.99 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="I+fvNf5D" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1725246049; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=t8331V5MBhR/kbLGUOQ7ZR657iI1p64L0luynItU5k4=; b=I+fvNf5DXO+HxAoETwfMMnvw1bintNz30Iw251TIg4DKBQnGT6jqIHN9lfHc5D4FiRD8koQqN7wO9O2DG5UncKjZN/X6tfNeHcRPk9rpIgqy1LePL/7S2B8Fa4KixZYbQ2wkU3Yvo7nvn+rcqoKpSBBK7Rq7NGwbSJYdequVP3s= Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0WE1odod_1725246046) by smtp.aliyun-inc.com; Mon, 02 Sep 2024 11:00:47 +0800 From: Shuai Xue To: bp@alien8.de, rafael@kernel.org, wangkefeng.wang@huawei.com, tanxiaofei@huawei.com, mawupeng1@huawei.com, tony.luck@intel.com, linmiaohe@huawei.com, naoya.horiguchi@nec.com, james.morse@arm.com, tongtiangen@huawei.com, gregkh@linuxfoundation.org, will@kernel.org, jarkko@kernel.org Cc: linux-acpi@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, linux-edac@vger.kernel.org, x86@kernel.org, xueshuai@linux.alibaba.com, justin.he@arm.com, ardb@kernel.org, ying.huang@intel.com, ashish.kalra@amd.com, baolin.wang@linux.alibaba.com, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, lenb@kernel.org, hpa@zytor.com, robert.moore@intel.com, lvying6@huawei.com, xiexiuqi@huawei.com, zhuo.song@linux.alibaba.com Subject: [PATCH v12 1/3] ACPI: APEI: send SIGBUS to current task if synchronous memory error not recovered Date: Mon, 2 Sep 2024 11:00:32 +0800 Message-ID: <20240902030034.67152-2-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20221027042445.60108-1-xueshuai@linux.alibaba.com> References: <20221027042445.60108-1-xueshuai@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-edac@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Synchronous error was detected as a result of user-space process accessing a 2-bit uncorrected error. The CPU will take a synchronous error exception such as Synchronous External Abort (SEA) on Arm64. The kernel will queue a memory_failure() work which poisons the related page, unmaps the page, and then sends a SIGBUS to the process, so that a system wide panic can be avoided. However, no memory_failure() work will be queued unless all bellow preconditions check passed: - `if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))` in ghes_handle_memory_failure() - `if (flags == -1)` in ghes_handle_memory_failure() - `if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))` in ghes_do_memory_failure() - `if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) ` in ghes_do_memory_failure() In such case, the user-space process will trigger SEA again. This loop can potentially exceed the platform firmware threshold or even trigger a kernel hard lockup, leading to a system reboot. Fix it by performing a force kill if no memory_failure() work is queued for synchronous errors. Suggested-by: Xiaofei Tan Signed-off-by: Shuai Xue --- drivers/acpi/apei/ghes.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index 623cc0cb4a65..b0b20ee533d9 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -801,6 +801,16 @@ static bool ghes_do_proc(struct ghes *ghes, } } + /* + * If no memory failure work is queued for abnormal synchronous + * errors, do a force kill. + */ + if (sync && !queued) { + pr_err("Sending SIGBUS to %s:%d due to hardware memory corruption\n", + current->comm, task_pid_nr(current)); + force_sig(SIGBUS); + } + return queued; }