From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gateway24.websitewelcome.com (gateway24.websitewelcome.com [192.185.50.66]) by sourceware.org (Postfix) with ESMTPS id 012AC3858D35 for ; Sat, 1 Aug 2020 20:47:58 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 012AC3858D35 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=tromey.com Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=tom@tromey.com Received: from cm16.websitewelcome.com (cm16.websitewelcome.com [100.42.49.19]) by gateway24.websitewelcome.com (Postfix) with ESMTP id 71C4E1D8C8 for ; Sat, 1 Aug 2020 15:47:57 -0500 (CDT) Received: from box5379.bluehost.com ([162.241.216.53]) by cmsmtp with SMTP id 1yQ9kau9xCjCV1yQ9kbQUr; Sat, 01 Aug 2020 15:47:57 -0500 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tromey.com; s=default; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=ihULGZbhz//IneG33cYVZE5jnd1zVQe6HYu3BFsLBrQ=; b=ucz8nzRb8ZKbVQ8B4HjK8CsWv+ 1fxvZ+7x2kv0hV4DP06jZ+WER0GraCijjCc76/e+MSrPKh9ozG/Iz86N3dydsJY8oGVwTZQuOG9Im jo9V+EXjzut8XgwzuQXvm2p9n; Received: from 174-16-104-48.hlrn.qwest.net ([174.16.104.48]:53084 helo=bapiya) by box5379.bluehost.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1k1yQ9-003xKQ-31; Sat, 01 Aug 2020 14:47:57 -0600 From: Tom Tromey To: John Baldwin Cc: Simon Marchi , Tom Tromey , Pedro Alves , gdb-patches@sourceware.org Subject: Re: [PATCH 02/23] Don't rely on inferior_ptid in record_full_wait References: <20190906232807.6191-1-palves@redhat.com> <20190906232807.6191-3-palves@redhat.com> <87h7tope4d.fsf@tromey.com> <9d4243a6-3b43-802b-b1d6-4cd0497205af@simark.ca> <93dfb190-2d7d-8337-b2b0-df160d1a0bf6@FreeBSD.org> X-Attribution: Tom Date: Sat, 01 Aug 2020 14:47:55 -0600 In-Reply-To: <93dfb190-2d7d-8337-b2b0-df160d1a0bf6@FreeBSD.org> (John Baldwin's message of "Sat, 1 Aug 2020 12:32:25 -0700") Message-ID: <878seyozyc.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box5379.bluehost.com X-AntiAbuse: Original Domain - sourceware.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tromey.com X-BWhitelist: no X-Source-IP: 174.16.104.48 X-Source-L: No X-Exim-ID: 1k1yQ9-003xKQ-31 X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 174-16-104-48.hlrn.qwest.net (bapiya) [174.16.104.48]:53084 X-Source-Auth: tom+tromey.com X-Email-Count: 7 X-Source-Cap: ZWx5bnJvYmk7ZWx5bnJvYmk7Ym94NTM3OS5ibHVlaG9zdC5jb20= X-Local-Domain: yes X-Spam-Status: No, score=-3025.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, JMQ_SPF_NEUTRAL, RCVD_IN_ABUSEAT, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_SBL_CSS, SPF_HELO_PASS, SPF_NEUTRAL, TXREP, URIBL_CSS, URIBL_CSS_A autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Aug 2020 20:47:59 -0000 >>>>> "John" == John Baldwin writes: John> Arguably though inf-ptrace.c should not return null_ptid that later John> triggers an obscure assertion failure, but instead it should probably John> just die with an explicit error() or the like. I thought about this approach, but target_wait's intro comment says: Note that it is _NOT_ OK to throw_exception() out of target_wait() without popping the debugging target from the stack; GDB isn't prepared to get back to the prompt with a debugging target but without the frame cache, stop_pc, etc., set up. However, parts of this are obsolete, so maybe the entire thing is. John> It's not really clear John> to me that we should be trying to do anything to gracefully handle an John> ENOCHILD error. Yeah, it does seem like kernel bug territory. Tom