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 D41F7CD4F5E for ; Wed, 20 May 2026 06:19:47 +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:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=y+oQO7RLNuJDf4qUq9ZXkKu2kJNnmahDIWX+FfPHgIE=; b=fPtheLaH/UvKlcc5b41I9QsE/r ObuBf6HpFajVpWfMDkFP7t9QA5givudHHwsgju06fldd9+BNe98CmXUiYKj2S+bUqSqsGyCn1FyFe oHm3d2NUFg6VlhVNbG+fAy+3QuAaVcRuT/mkfdJvUpjAHVyiUh02aOjiep3oAvoPhMs3rpZG9GAgO /G+QWEBi1aLQHLJ7H+mQSPuJSWsv8eX2sd31Yjr/jsC4FFTmPcUyrTZKkmVwQPI8H3QSrVZtyeGJz 6jjg7OE8CPkvb/0P9+b4mcwaq4+Zf19GMIRfh2CXfH2ziH5P4633ySG8WhE34TgmHSg00wGYRgQge V8B4ZAHg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPaHP-00000003dm1-0ioj; Wed, 20 May 2026 06:19:43 +0000 Received: from galois.linutronix.de ([193.142.43.55]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPaHL-00000003dkJ-0eUD for linux-arm-kernel@lists.infradead.org; Wed, 20 May 2026 06:19:42 +0000 Date: Wed, 20 May 2026 08:19:20 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1779257962; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=y+oQO7RLNuJDf4qUq9ZXkKu2kJNnmahDIWX+FfPHgIE=; b=P6+oqLlL4bnQTSu2n0zKK01Ew7ScsATyYZvIYVSe7ttHWoUMDq8DN68cf29PQU8Dq5HIiI lpSMQlDfJsnMzzx0r14lx9+E5PN8eqKBM3Kn3SfaSrLMJ6tVurPphfqFWW5s8Hvc1cBZfB U2KQVsG9AKP1zrqc6C3guqgeHrz+ncPTf14QOWQbwTbrSl3RnZJSLszx/+LCXgZaPendB2 AuUoBugOIKV4ZbtALNiu8WcYxlvIn23LgeN0fjb/uYDcToCfPBV6vt9G1AGJqMB1qIp0ni eZSIx0RYgIH0TGCn5LiuN74oVABVWLe9v8FukHDFoWfGE/NtO0tfjMuS2WdwUw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1779257962; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=y+oQO7RLNuJDf4qUq9ZXkKu2kJNnmahDIWX+FfPHgIE=; b=m4pxxi/41Ii8jM6hXoGv89KCZT+zmgpcacIXgXgpsf5uav74mKO2geuwbKby8RWX+wkAms orxgFruU8Al/CoAw== From: Sebastian Andrzej Siewior To: Waiman Long Cc: Catalin Marinas , Will Deacon , Mark Rutland , Clark Williams , Steven Rostedt , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH] arm64/entry: Don't disable preemption in debug_exception_enter() with RT kernel Message-ID: <20260520061920.XCqBHe0x@linutronix.de> References: <20260519222524.886454-1-longman@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <20260519222524.886454-1-longman@redhat.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260519_231940_266787_36065359 X-CRM114-Status: UNSURE ( 6.57 ) 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 On 2026-05-19 18:25:24 [-0400], Waiman Long wrote: > Commit d8bb6718c4db ("arm64: Make debug exception handlers visible from > RCU") introduces debug_exception_enter() and debug_exception_exit() > where preemption is explicitly disabled. With a PREEMPT_RT debug kernel, > the following bug report can happen. =E2=80=A6 What kernel is this? I have backport (which is being tested) for v6.6 and v6.12, the patches are from v6.17-rc1. Sebastian