Date: Thu, 17 May 2018 10:01:39 +1000 From: Dewayne Geraghty <dewayne.geraghty@heuristicsystems.com.au> To: Dimitry Andric <dim@FreeBSD.org>, Mike Tancsa <mike@sentex.net> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@FreeBSD.org> Subject: Re: uptime / w coredumping on RELENG11 (i386 only) Message-ID: <9d2e0a4d-b2d7-315a-cc17-7965913aea39@heuristicsystems.com.au> In-Reply-To: <D80B47F4-16DD-4C69-A0AB-1F518F584566@FreeBSD.org> References: <990862af-7bee-0d4b-c01f-d7fc8e5b6cfe@sentex.net> <955d6681-0048-5e09-cca6-4691b05bf48f@sentex.net> <18E4C626-410B-417F-89F2-4F16074749A1@FreeBSD.org> <865dd1e1-b29e-7d5b-41a5-e23a07b2f981@sentex.net> <D80B47F4-16DD-4C69-A0AB-1F518F584566@FreeBSD.org>
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On 17/05/2018 7:17 AM, Dimitry Andric wrote: > On 16 May 2018, at 15:54, Mike Tancsa <mike@sentex.net> wrote: >> On 5/15/2018 2:31 PM, Dimitry Andric wrote: >>> On 15 May 2018, at 20:22, Mike Tancsa <mike@sentex.net> wrote: >>>>> Anyone else see this ? >>> See <https://bugs.freebsd.org/227552>. There is a fix coming up. >> I tried the patch and did a full rebuild and it indeed fixed the problem >> for me. Is the bug potentially more wide spread that just libxo ? Also >> does it possibly affect amd64, just in a non obvious way ? > Yes to both, at least theoretically. The problem is actually in > elftoolchain's strip command, which can mess up the TLS section in an > executable or shared library. When the dynamic linker loads such a bad > file, it will setup incorrect TLS data, which can lead to crashes. > > In case of libxo.so.0, this appears to have been caused by clang 6 > giving a slightly different ELF layout than clang 5. During buildworld, > libxo.so.0 is built with debugging information, which is later copied > to a libxo.so.0.debug file, while it is removed from the original > libxo.so.0 file. > > Up to this point, everything is still fine with libxo.so.0, still, but > during installworld, the file is stripped *again*, by install -s (this > is something we should revisit because it seems no longer useful). This > second round of stripping messes up the TLS section. > > -Dimitry > Revisit? Perhaps, but it seems that its a regression against clang6 over clang5. Looking at https://svnweb.freebsd.org/base?view=revision&revision=333600 its appears that the section flags are correctly applied now. When 333600 enters 11.1Beta?, do you think the build/installation process requires revision? Its a little disappointing to hear that the stripping process breaks the output, if applied >1. -- Influence national support against IP address spoofing (pretending to be someone else), refer: http://www.bcp38.info/index.php/Main_Page
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