From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/2208 Path: news.gmane.org!not-for-mail From: Brian Wang Newsgroups: gmane.linux.lib.musl.general Subject: Re: Difference between -O2 and -g Date: Fri, 26 Oct 2012 11:01:47 +0800 Message-ID: References: <20121026014022.GT254@brightrain.aerifal.cx> <20121026023254.GU254@brightrain.aerifal.cx> <20121026025545.GV254@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1351220519 27317 80.91.229.3 (26 Oct 2012 03:01:59 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 26 Oct 2012 03:01:59 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-2209-gllmg-musl=m.gmane.org@lists.openwall.com Fri Oct 26 05:02:08 2012 Return-path: Envelope-to: gllmg-musl@plane.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1TRaBU-0005Nl-5k for gllmg-musl@plane.gmane.org; Fri, 26 Oct 2012 05:02:08 +0200 Original-Received: (qmail 24284 invoked by uid 550); 26 Oct 2012 03:01:59 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 24276 invoked from network); 26 Oct 2012 03:01:59 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=eriuzPkaHZR6hLLpf9pwR2w8uY5AjljvwZZPytzo1lc=; b=XctOuwvNCxhRQyy2zezRC1xT83whxiITDiSkYKxcrhidPzgRoREwa3fScsCJZMWzjw 1CpunK2eEisDRDoCzmnUygQcQOw8JjfDX5onPuIMQukQ+dPzaI49U8GBAK2bxeauhGdK rtPZT+BmWxFfmqsbjxxUIzKnqrBWbHzgExigeM1C4CTqjIDX3s3+FFsqG+ackYEyeX02 SKYfTT4YyNW/vrkOR+NftmjPT0ZXFUt571TogFisiQbwsX2PcWnoz5XAMOBR+jTK0Lzz lo8lIA7wEA2MHNbVy4klUewMfL7ehfjbWwxR8r8gP92vTbGV25PirObAFIA9kiEHpbeF lGxg== In-Reply-To: <20121026025545.GV254@brightrain.aerifal.cx> Xref: news.gmane.org gmane.linux.lib.musl.general:2208 Archived-At: On Fri, Oct 26, 2012 at 10:55 AM, Rich Felker wrote: > On Fri, Oct 26, 2012 at 10:47:57AM +0800, Brian Wang wrote: >> On Fri, Oct 26, 2012 at 10:32 AM, Rich Felker wrote: >> > On Fri, Oct 26, 2012 at 10:04:46AM +0800, Brian Wang wrote: >> >> > One very simple way to get a picture of what's going on in a program >> >> > is to run it under strace. Try saving strace logs for both the working >> >> > version and the broken version and comparing them either manually or >> >> > with the diff utility (although the latter may be difficult unless you >> >> > filter out the addresses and other contnets that will naturally >> >> > differ, so it might be easier to visually inspect). If you don't >> >> > already have an strace built for your target, I think Aboriginal Linux >> >> > has static binaries you can use. >> >> >> >> I have previously built my static strace. >> >> I could not decipher what went wrong. Please find the strace logs for >> >> the three binaries in question. >> >> The source code is basically the same, except for the musl ones, >> >> printf calls are sprinkled here and there >> >> as my desperate attempt. >> > >> > The good and bad traces diverge at this line, which only happens in >> > the good one: >> > >> > writev(2, [{"CreateColormap : good end\n", 26}, {NULL, 0}], 2) = 26 >> > >> > So search the source for that string and see what condition is causing >> > that code to be reached or not reached. >> >> Thank you for reading through them. :-) >> >> The failed call (XaceHook) is: >> ----------- >> /* >> * Security creation/labeling check >> */ >> i = XaceHook(XACE_RESOURCE_ACCESS, clients[client], mid, RT_COLORMAP, >> pmap, RT_NONE, NULL, DixCreateAccess); >> if (i != Success) { >> fprintf(stderr, "%s : 9\n", __func__); >> FreeResource(mid, RT_NONE); >> return i; >> } >> ----------- > > It would help a lot if I knew what source you were using, or at least > the part of the tree it corresponds to in the upstrea/latest X source > tree, so I could take a look at it. I am using a mildly patched one based on: http://xorg.freedesktop.org/archive/individual/xserver/xorg-server-1.5.1.tar.bz2 The patch is about displaying a background ppm image and should be after the error path. The failed call is within dix/colormap.c:CreateColormap(). Thanks for helping. I really appreciate it. Brian -- brian ------------------ Cool-Karaoke - The smallest recording studio, in your palm, open-sourced http://cool-idea.com.tw/ iMaGiNaTiOn iS mOrE iMpOrTaNt tHaN kNoWlEdGe