From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id ANfbIeH312D4YwAAWB0awg (envelope-from ) for ; Sun, 27 Jun 2021 00:00:33 -0400 Received: by simark.ca (Postfix, from userid 112) id 7C16B1F1F2; Sun, 27 Jun 2021 00:00:33 -0400 (EDT) X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on simark.ca X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,RDNS_DYNAMIC,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.2 Received: from sourceware.org (ip-8-43-85-97.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPS id B9F181EE14 for ; Sun, 27 Jun 2021 00:00:32 -0400 (EDT) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 76772388E83E for ; Sun, 27 Jun 2021 04:00:32 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 76772388E83E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624766432; bh=zaLGtp2c6f9scouVK5GHceA9V8YwbcXUQ7eq2YuWh9Q=; h=Subject:To:References:Date:In-Reply-To:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=dkS2gJfpn+Q4GBYPaTxQ31uet4qmRBGkHx0HbTJocQD/IKA1E61z5+PHmUWE3rqkC K65dHb7VxUW7zmZeWoRAtp6ztzaldvvZ5KJ1IgN2gF/q0w9p2PToqrBbhlqYajikhp syHEzHfQlD0T3Fo1M/Pyd8/YccX6Jwf2r4Je+QUU= Received: from smtp.polymtl.ca (smtp.polymtl.ca [132.207.4.11]) by sourceware.org (Postfix) with ESMTPS id 086663870877 for ; Sun, 27 Jun 2021 04:00:07 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 086663870877 Received: from simark.ca (simark.ca [158.69.221.121]) (authenticated bits=0) by smtp.polymtl.ca (8.14.7/8.14.7) with ESMTP id 15R400O8030997 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 27 Jun 2021 00:00:05 -0400 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp.polymtl.ca 15R400O8030997 Received: from [10.0.0.11] (192-222-157-6.qc.cable.ebox.net [192.222.157.6]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPSA id 7EC101E54D; Sun, 27 Jun 2021 00:00:00 -0400 (EDT) Subject: Re: GDB and MacOS 11.4/BigSur To: Sam Warner References: <9717BBC8-70FA-47DD-8C62-33018D746003@me.com> <5180de47-136f-bad7-9f83-78ac02a323c6@polymtl.ca> Message-ID: Date: Sun, 27 Jun 2021 00:00:00 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <5180de47-136f-bad7-9f83-78ac02a323c6@polymtl.ca> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Poly-FromMTA: (simark.ca [158.69.221.121]) at Sun, 27 Jun 2021 04:00:00 +0000 X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Simon Marchi via Gdb Reply-To: Simon Marchi Cc: gdb@sourceware.org Errors-To: gdb-bounces+public-inbox=simark.ca@sourceware.org Sender: "Gdb" On 2021-06-26 8:51 p.m., Simon Marchi via Gdb wrote:> > > On 2021-06-26 7:27 p.m., Sam Warner wrote: >> Hi Simon, >> :), perfect, how can I help? > > Specifically, with the bug you reported, you would need to figure out > why the global current_thread_ is nullptr at the point inferior_thread > is called. In fact, all this happens before you tried to run anything, > so it's expected that there is no current thread: there are no threads > at all yet. > > So, try to get a backtrace so we at least know which inferior_thread > call that is. You can try to attach a working GDB to the broken GDB > while it's at the "would you like to create a core dump" question. If > GDB is too broken, you can try lldb, whatever works. > > Once we have that, we figure out a solution :). Hi Sam, I had a bit of time, so I took a quick look and wrote a patch: https://sourceware.org/pipermail/gdb-patches/2021-June/180396.html This problem doesn't seem too complicated, but note that I won't always be able to look into macOS-related problems, especially if they are more difficult to fix than this one and require more platform-specific knowledge. I don't own a Mac myself, I just have access to a relatively slow VM that is a bit painful to use. So it would still be really awesome if we had someone to turn to for macOS-related problems. Simon