From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1BC8BC28B2E for ; Wed, 12 Mar 2025 09:42:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:Date:Message-ID:CC:To:Subject:From:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=rNJNm/sXbTRzkUJ8kN4EcHCqnFmPI684Yqg2otE7lKU=; b=0NuDNQ4tfuSeozJI4KGuKvyzkd 9wg1xsPZz7e2jnM0ARw2Jr3V6WJs+OyspGWISwJPrq1nN93mdGPJIAi+BKId8a+JSXHA1NTdCDWYm wXRr789ysdTdonkvzflC8Ihx2dKuOonACXbWQPHHMb7HZMcOj1ldixi23BdM2o426eTozRSt1bgwO fv1ZSM8/XIRhGy0zVhctqVWtpkZiucjjQpd/FqWl4Vsdi4mgwd3YzI9hdF/Gy/BButLQixnWQyzFm i/fptHrG/Tado2A64QLirsozyZY1ID3WJfRelHIRxdDttDEcGEs9wrJxlpSIyRvajSpCnciBzo5ha TFUPnZ+Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tsIbG-000000080dH-3SMg; Wed, 12 Mar 2025 09:42:06 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tsINh-00000007xs0-2GWH for linux-arm-kernel@lists.infradead.org; Wed, 12 Mar 2025 09:28:07 +0000 Received: from mail.maildlp.com (unknown [172.19.88.105]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4ZCQHR3jggzqVVr; Wed, 12 Mar 2025 17:26:27 +0800 (CST) Received: from kwepemk200017.china.huawei.com (unknown [7.202.194.83]) by mail.maildlp.com (Postfix) with ESMTPS id C2D6F1401F0; Wed, 12 Mar 2025 17:27:56 +0800 (CST) Received: from [10.174.178.219] (10.174.178.219) by kwepemk200017.china.huawei.com (7.202.194.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Wed, 12 Mar 2025 17:27:56 +0800 From: Zenghui Yu Subject: [report] WARN_ON_ONCE() was triggered with pseudo NMI enabled To: CC: Catalin Marinas , Will Deacon , Mark Rutland Message-ID: Date: Wed, 12 Mar 2025 17:27:50 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.178.219] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemk200017.china.huawei.com (7.202.194.83) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250312_022805_729860_7E5B3FDF X-CRM114-Status: UNSURE ( 5.06 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, With pseudo NMI enabled, I can trigger the following splat when running selftests (e.g., arm64/signal/fake_sigreturn_bad_magic, which will issue a BRK instruction). ------------[ cut here ]------------ WARNING: CPU: 5 PID: 386876 at ./arch/arm64/include/asm/irqflags.h:34 send_user_sigtrap+0xc8/0xd0 CPU: 5 UID: 0 PID: 386876 Comm: fake_sigreturn_ Kdump: loaded Not tainted 6.14.0-rc6-00017-g5e35b5d3ce97-dirty pstate: 204003c9 (nzCv DAIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : send_user_sigtrap+0xc8/0xd0 lr : brk_handler+0x3c/0xbc sp : ffff8000ade3be00 pmr: 000000f0 x29: ffff8000ade3be00 x28: ffff00209777c600 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000400e30 x23: ffff800082cb8458 x22: ffff800082cb83c8 x21: 00000000f200029a x20: ffff8000ade3beb0 x19: ffff8000ade3beb0 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff8000827e6638 x5 : 0000000000000000 x4 : ffff8000827e6638 x3 : 0000000060000000 x2 : ffff8000ade3c000 x1 : 0000000000000001 x0 : 00000000000000d0 Call trace: send_user_sigtrap+0xc8/0xd0 (P) brk_handler+0x3c/0xbc do_debug_exception+0x68/0x110 el0_dbg+0x28/0xb8 el0t_64_sync_handler+0x50/0xcc el0t_64_sync+0x1ac/0x1b0 ---[ end trace 0000000000000000 ]--- I use mainline and the kernel is built with defconfig + ARM64_PSEUDO_NMI + ARM64_DEBUG_PRIORITY_MASKING. Thanks, Zenghui