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[139.178.88.99]) by mx.google.com with ESMTPS id c1-20020a17090a8d0100b002a4c1597e13si12087818pjo.131.2024.05.06.20.33.12 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 May 2024 20:33:12 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel+bounces-170617-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; arc=pass (i=1 spf=pass spfdomain=kylinos.cn); spf=pass (google.com: domain of linux-kernel+bounces-170617-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-170617-linux.lists.archive=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id A17AF284B68 for ; Tue, 7 May 2024 03:33:12 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4FBF7433AE; Tue, 7 May 2024 03:33:03 +0000 (UTC) Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 E78D14C94; Tue, 7 May 2024 03:32:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715052782; cv=none; b=UdXsZFb3e8dF/BrqTRQHpsc7mYXPVnjvwha9m7ZXC0HHUnpEdtGh0Qw7jPkR87hcY+WK0C1apNdx2CpJQ1QpcVRiZqpBxN3evFD/cGNUHBRt89n5p3I+/Fsg0FvFhYWn6vvosrn2sLtGarmp1A4vSjFUvPVaq7yUUq5MF53tyhM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715052782; c=relaxed/simple; bh=7wd/yUfKcL6tjsmswtHH9lv5HGLnvEwVClY4hN6jGIs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=iU7Mw87T14BXVyCpL4zBzH6eCSFQ/Lql+BhoLepwTGbwwT4gybU1g3he8sOnAheE8E+VHMZOOd1L8r67r1j3ew+ruVjOfntVGrULUOAY5MXe1U7onwQPN8w5FYSncEwquadBBYKXDgOFrJdBkyLS9WeIRGcpJkBGXfwSv9NIdec= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 77bd87380c2211ef9305a59a3cc225df-20240507 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.37,REQID:9ce386ab-0914-421d-8764-ed15d5d60748,IP:20, URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:-15,FILE:0,BULK:0,RULE:Release_Ham,ACT ION:release,TS:0 X-CID-INFO: VERSION:1.1.37,REQID:9ce386ab-0914-421d-8764-ed15d5d60748,IP:20,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:-15,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:0 X-CID-META: VersionHash:6f543d0,CLOUDID:953b18f2e0dff68bcc53e53b1d5fe9c7,BulkI D:2405071132467M9YECP2,BulkQuantity:0,Recheck:0,SF:19|44|66|24|17|102,TC:n il,Content:0,EDM:-3,IP:-2,URL:1,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,CO L:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 1,UOG X-CID-BAS: 1,UOG,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD,TF_CID_SPAM_FSI, TF_CID_SPAM_ULS X-UUID: 77bd87380c2211ef9305a59a3cc225df-20240507 Received: from node2.com.cn [(39.156.73.10)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 764133066; Tue, 07 May 2024 11:32:44 +0800 Received: from node2.com.cn (localhost [127.0.0.1]) by node2.com.cn (NSMail) with SMTP id A4719B8075B2; Tue, 7 May 2024 11:32:44 +0800 (CST) X-ns-mid: postfix-6639A0DC-523906690 Received: from localhost.localdomain (unknown [10.42.176.164]) by node2.com.cn (NSMail) with ESMTPA id DBB2FB8075B2; Tue, 7 May 2024 03:32:42 +0000 (UTC) From: Yun Lu To: hdanton@sina.com Cc: linux-kernel@vger.kernel.org, syzbot+1acbadd9f48eeeacda29@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com, vinicius.gomes@intel.com, jhs@mojatatu.com, netdev@vger.kernel.org Subject: Re: [syzbot] [kasan?] [mm?] INFO: rcu detected stall in __run_timer_base Date: Tue, 7 May 2024 11:32:42 +0800 Message-Id: <20240507033242.1616594-1-luyun@kylinos.cn> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240414025336.2016-1-hdanton@sina.com> References: <20240414025336.2016-1-hdanton@sina.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Hello, Indeed, the taprio hrtimer does cause CPU stuck in certain specific scena= rios, and this patch indirectly confirms it. However, it seems this patch isn't the final solution?=20 On my testing machine, after starting Taprio hrtimer and then adjusting t= he system time backward, it can be observed that the taprio hrtimer indeed g= ets stuck in an infinite loop through tracing. And, the patch below can effectively= resolve this issue, but it doesn't work for syzbot's tests. https://lore.kernel.org/all/20240506023617.1309937-1-luyun@kylinos.cn/ Are there any better suggestions from others regarding the resolution of = this CPU stuck issue?