From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 100276 invoked by alias); 6 Jun 2016 07:25:03 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 100121 invoked by uid 89); 6 Jun 2016 07:25:02 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-0.9 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,SPF_HELO_PASS autolearn=no version=3.3.2 spammy=H*M:cygwin, H*Ad:U*yselkowitz, Hx-languages-length:2082, H*f:sk:4311402 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Mon, 06 Jun 2016 07:25:01 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E6AF53DB for ; Mon, 6 Jun 2016 07:24:59 +0000 (UTC) Received: from [10.10.116.38] (ovpn-116-38.rdu2.redhat.com [10.10.116.38]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u567Ow1X008782 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 6 Jun 2016 03:24:59 -0400 Subject: Re: [ANNOUNCEMENT] mesa 11.0.9-2 To: cygwin@cygwin.com References: <570D122B.50307@gmail.com> <570DAFFA.7020700@cygwin.com> <4311402a-fb7d-c68a-9cb3-954161a37e58@dronecode.org.uk> From: Yaakov Selkowitz Message-ID: Date: Mon, 06 Jun 2016 07:25:00 -0000 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: <4311402a-fb7d-c68a-9cb3-954161a37e58@dronecode.org.uk> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2016-06/txt/msg00049.txt.bz2 On 2016-06-03 12:56, Jon Turney wrote: > On 31/05/2016 18:03, Jon Turney wrote: >> On 13/04/2016 03:33, Yaakov Selkowitz wrote: >>> On 2016-04-12 10:20, Marco Atzeri wrote: >>>> $ cd /usr/lib/mesa-demos >>>> $ ./quad-clip.exe >>>> GL_RENDERER = Gallium 0.4 on llvmpipe (LLVM 3.7, 256 bits) >>>> GL_VERSION = 3.0 Mesa 11.0.9 >>>> GL_VENDOR = VMware, Inc. >>>> Segmentation fault (core dumped) >>> >>> I can reproduce this on 32-bit but not 64-bit, and the same happens with >>> 11.1.2. It may be an issue with LLVM 3.7 (11.0.9-1 was built with 3.5) >>> but without a useful backtrace it will be hard to pin down. >> >> gdb can successfully backtrace this, with today's cygwin snapshot. >> >> Both examples of the crash provided by Marco show very similar symptoms. >> >> Unfortunately, the backtrace stops at llvm_pipeline_generic() calling >> into some JIT-ed code. The faulting is at an insertps instruction with >> what looks like a bogus absolute address. >> >> So I guess this some is an llvm issue, possibly with some address >> computation which doesn't give the right result on 32 bit? >> >>> # gdb ./quad-clip >>> [...] >>> (gdb) r >>> [...] >>> Program received signal SIGSEGV, Segmentation fault. >>> 0x7fdf00c1 in ?? () > [...] >>> /usr/src/debug/mesa-demos-8.3.0-1/src/trivial/quad-clip.c:137 >>> (gdb) disassemble 0x7fdf00b1,0x7fdf00d2 >>> Dump of assembler code from 0x7fdf00b1 to 0x7fdf00d2: >>> 0x7fdf00b1: insertps $0x10,0x4(%eax,%edi,1),%xmm0 >>> 0x7fdf00b9: insertps $0x20,0x8(%eax,%edi,1),%xmm0 >>> => 0x7fdf00c1: insertps $0x30,0xfffeff34,%xmm0 >>> 0x7fdf00cb: mov (%esi),%eax >>> 0x7fdf00cd: mul %ecx > > After staring this a bit more, I see that this is the offset to the data > to load, apparently being used as an absolute address > > This seems to be the case with other addresses in the JIT-ed code, so > perhaps there is some problem preventing relocations being applied... FWIW, I tried rebuilding with llvm 3.8.0. 32-bit doesn't crash anymore, and glxgears says its running, but only the background shows. -- Yaakov -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple