From: Tom Lane <tgl@sss.pgh.pa.us>
To: Michael Paquier <michael.paquier@gmail.com>
cc: Dmitry Dolgov <9erthalion6@gmail.com>,
        Vincent Lachenal <vincent.lachenal@gmail.com>,
        PostgreSQL mailing lists <pgsql-bugs@postgresql.org>
Subject: Re: BUG #14897: Segfault on statitics SQL request
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Comments: In-reply-to Michael Paquier <michael.paquier@gmail.com>
	message dated "Sat, 11 Nov 2017 17:39:11 +0900"
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Date: Sun, 12 Nov 2017 12:39:12 -0500
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Michael Paquier <michael.paquier@gmail.com> writes:
> On Sat, Nov 11, 2017 at 8:06 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> My Fedora box thinks __alignof__(__int128) is 16, which is suspicious,
>> but it's not crashing.

> My laptop uses Arch, and I can see the crash easily when compiling
> with gcc 7.2 which is the one bundled in the core package set:

In hopes of reproducing this bug locally, I updated my Fedora laptop
to F26, which has gcc 7.2.1.  But I still can't get it to generate any
SIMD instructions for numeric.c, even after considerable fooling about
with -march and related compiler flags.  I wonder whether Arch is
enabling some bleeding-edge gcc build flags that Red Hat doesn't trust
yet.  It might be interesting to compare outputs of "gcc -v".  Mine is

$ gcc -v
Using built-in specs.
COLLECT_GCC=3D/usr/bin/gcc
COLLECT_LTO_WRAPPER=3D/usr/libexec/gcc/x86_64-redhat-linux/7/lto-wrapper
OFFLOAD_TARGET_NAMES=3Dnvptx-none
OFFLOAD_TARGET_DEFAULT=3D1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=3Dc,c++=
,objc,obj-c++,fortran,ada,go,lto --prefix=3D/usr --mandir=3D/usr/share/man =
--infodir=3D/usr/share/info --with-bugurl=3Dhttp://bugzilla.redhat.com/bugz=
illa --enable-shared --enable-threads=3Dposix --enable-checking=3Drelease -=
-enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwi=
nd-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gc=
c-major-version-only --with-linker-hash-style=3Dgnu --enable-plugin --enabl=
e-initfini-array --with-isl --enable-libmpx --enable-offload-targets=3Dnvpt=
x-none --without-cuda-driver --enable-gnu-indirect-function --with-tune=3Dg=
eneric --with-arch_32=3Di686 --build=3Dx86_64-redhat-linux
Thread model: posix
gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)=20

			regards, tom lane


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