From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id NsF9LcLA3mj7phwAWB0awg (envelope-from ) for ; Thu, 02 Oct 2025 14:13:22 -0400 Authentication-Results: simark.ca; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=btRQVh4A; dkim-atps=neutral Received: by simark.ca (Postfix, from userid 112) id AC8851E0B6; Thu, 02 Oct 2025 14:13:22 -0400 (EDT) X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-25) on simark.ca X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=ARC_SIGNED,ARC_VALID,BAYES_00, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED,RCVD_IN_VALIDITY_CERTIFIED_BLOCKED, RCVD_IN_VALIDITY_RPBL_BLOCKED,RCVD_IN_VALIDITY_SAFE_BLOCKED autolearn=ham autolearn_force=no version=4.0.1 Received: from server2.sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPS id EA5EA1E047 for ; Thu, 02 Oct 2025 14:13:21 -0400 (EDT) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 7CA67385842D for ; Thu, 2 Oct 2025 18:13:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7CA67385842D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1759428801; bh=q+AghvPZPB3ErMWNK9J6LkhT14YMKbN9dXG8fnFFEPs=; h=Date:Subject:To:Cc:References:In-Reply-To:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From:Reply-To:From; b=btRQVh4AfIWU/2RWN12dOK/JSeSiFZyQUZ53hV4y44QR8r7DJEfNVFfDMUjSI9x0e ap4LG9cEsevq8NZkOom32H9+u2Jy1QBjXynDNnSWVNuNZEI7v2S//9KMAYZL0fdloa 8IgERYjySoLNtH8Z7nKS9OSQ90Bin1jE6axmbKiw= Received: from mail-il1-x135.google.com (mail-il1-x135.google.com [IPv6:2607:f8b0:4864:20::135]) by sourceware.org (Postfix) with ESMTPS id 2E9B53858C56 for ; Thu, 2 Oct 2025 18:12:29 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 2E9B53858C56 ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 2E9B53858C56 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1759428749; cv=none; b=oWyVMmSg5hmbriiCOodKUUz4DL1XaNwZnJ0Iqk0w0TNY376npGNnbUC5LHgsARdFgOgDhXOgCeYap87Q+nihR4oT/0coSsAj6ZA/PzJF52gTWDgS2eEF7XQNdYcYgSzeyLs92Aqcpqwz8T447RiiKJwdjK2PCOgRzGg126ADKhk= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1759428749; c=relaxed/simple; bh=tSslv9IzwOdgDUUZom5M201z61sxjC7Ar/EU8O9rb6k=; h=DKIM-Signature:Message-ID:Date:MIME-Version:Subject:To:From; b=FcJpQkk+lBANNWm4LyROT62SHOyZl7M4xoBaJHb6rYVf+06HY8VLIuEJAOwd1BAuq1E79R+4EypV2dCy+E9eQv/Ixx4ELwPsrrsBSuhvGgOsmDxQ4LPal/kh/IPD6fZOXQOqjwC/3EOc0JE7/aCcaGIyGKNgig/wyhLwNLHObSk= ARC-Authentication-Results: i=1; server2.sourceware.org DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2E9B53858C56 Received: by mail-il1-x135.google.com with SMTP id e9e14a558f8ab-42d8ad71a51so15282175ab.1 for ; Thu, 02 Oct 2025 11:12:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759428748; x=1760033548; h=content-transfer-encoding:in-reply-to:content-language:from :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=q+AghvPZPB3ErMWNK9J6LkhT14YMKbN9dXG8fnFFEPs=; b=rq//h0IrSRzkBt+AQfaZoQFqs4kNwyOd1oALqcibWj9U6C++TFQwGx4VwVP58+f6Rz QAGZYA76znnS5Rr6XLktiyhrMvQNQzAmBowyhX5Mk50/FBOILMqmXpmLkZ/4x8I6IcQ2 xCSg+EvHViCegwj/DCeFwtZtwEI1QbzvodQDuFWxonH3gjjhv2aEoh7tWKH+kgTLcFVJ XSVZDIQ4IH7mAaHukM1Qwtwn/O1WlQ0NIiKDVcngC9St21g5IuPbLtALvKd6m8hth6mr xViXCIJDGQhFZnk/BFteae93AVPAmu9ycbYD8fUJoWVmyrPH2lEPVoapmhaarDBHROA1 +JmA== X-Forwarded-Encrypted: i=1; AJvYcCVzME5XSOccQdq8EITURYP3WDJ3ghJ/W+GPiFGbDkzb8M2ynzuDR4DD8vfZ9+GfUfWZbiI=@sourceware.org X-Gm-Message-State: AOJu0YzaefIp+y+WNlQ91kFEPt+28cwGwban2xaXGXPLdkWGmMhdVA4+ Tfm4ouJydZ8uFkP9EX/qZ+FHo52GPMARwNYkv4WTg0O7bGm5GyXbD+klynRI/urmgpo= X-Gm-Gg: ASbGncv71BdYs4NO/CMFCE+sHfJKrhkFLlngKExG35RdeCWRosRzv+KO8i4hLcSWB/5 aatWH2yvsXl/oB5POIk8EWywggfHLYHBHMTv7pDmQYm8I64BGk1AUtUd6ISy8P05POJt9aPoW1G y5aJ3P607sIXDSmiCYoGAAb4Z/BAN+IQRzVfOb3d5Lrlx8/bBwS/pwWthOyWpTURZ8NipWX6Iwe AQNWmiDcCjL4eca0zc/wkUGCX/6RibP2EZoZ8rpec4HJAkqtdgQIZQRVOYmUpTxh/Br0QYwAgtU fIk3y8cZMwmq3t273pzvBsWRPpmCOpV4MlkC1QxLYmx+mhc240C0ZuXMC94A3VakU/6QfD+PiP5 WeJNEBqtzNe5k+GcFoaMzwia4ggeOFuBGi0NAPpo04fNgEGbgIdeJy5tP8DaoJeV/WmmLBstuOw MqwW+YvE0gaagzeKhbZWjoz/uOwZU7RA== X-Google-Smtp-Source: AGHT+IEHmhyXVfGNbuciJR2jiRQvyJxTSxgcswMNpnW+p5veE2tkkKe0+fO/sNlA0tuZ26ggjHcmiA== X-Received: by 2002:a05:6e02:160b:b0:424:80f2:2a3 with SMTP id e9e14a558f8ab-42e7acec6f3mr6651505ab.6.1759428748074; Thu, 02 Oct 2025 11:12:28 -0700 (PDT) Received: from [192.168.86.35] (syn-174-082-221-071.res.spectrum.com. [174.82.221.71]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-42d8b1f39b9sm12566985ab.7.2025.10.02.11.12.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Oct 2025 11:12:27 -0700 (PDT) Message-ID: Date: Thu, 2 Oct 2025 13:12:26 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [EXT] Re: gdb does not stop at printf for ppc To: Florian Weimer , Peter Bergner via Libc-help Cc: Adhemerval Zanella Netto , Sachin Monga , "libc-alpha@sourceware.org" , gdb@sourceware.org, Segher Boessenkool , Michael Meissner , Surya Kumari Jangala , Carl Love References: <0535055f-7a42-4390-b134-34b8e3ee657e@linaro.org> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Peter Bergner via Gdb Reply-To: Peter Bergner Errors-To: gdb-bounces~public-inbox=simark.ca@sourceware.org Sender: "Gdb" On 10/2/25 11:58 AM, Florian Weimer wrote: > * Peter Bergner via Libc-help: > >> Ok, it's an even bigger problem than we thought. I'm surprised no one >> else has hit this before us. > > We've encountered it with fortification and IFUNC resolvers. It used to > be considered a user error. Yeah, I don't think we can consider this a user error, since the user called printf() and so should validly expect that "break printf" in gdb should work. It was only the shifty compiler that silently replaced printf with __printfieee128 that broke everything! :-) >> Ok, this is promising and yeah, is what Carl and Uli suggested. >> That said, their comment from the bugzilla: >> >> The new redirected symbols need to be dynamic symbols in case only >> the stripped binary is available. > > I'd recommend distributions do not strip .symtab on libc.so.6. I don't > think making this a dynamic symbol is worth it. It would have to be a > compatibility symbol under a separate symbol version, one for each > variant alias (eight for POWER?). This is quite a bit of complexity. I'd be fine with that, if that is what everyone else thinks is best. Worst case, a distro strips libc.so.6 and we're just back with the current state of behavior. Do we know what Debian/Ubuntu and Gentoo do wrt strpping or not stripping libc.so.6? I definitely don't like the idea of all of those compatibility symbols! Peter