Re: SerializeParamList vs machines with strict alignment

On Wed, Oct 3, 2018 at 7:55 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> writes:
> >> Okay, I have pushed the test case patch on HEAD. Attached is the
> >> code-fix patch, let's wait for a day so that we have all the results
> >> which can help us to discuss the merits of this patch.
>
> > By now, the added test has failed on gharial [1] with below log on the server:
>
> Yeah, gharial and anole both don't like this, which is interesting
> but not really surprising, considering that IA64 is in some part
> an HPPA follow-on architecture. What I find more interesting is
> that both of the live Sparc critters are happy --- so despite
> Thomas' statements upthread, they're coping with unaligned accesses.

Just for fun:

$ curl -O https://people.debian.org/~aurel32/qemu/sparc/debian_etch_sparc_small.qcow2
$ qemu-system-sparc -hda debian_etch_sparc_small.qcow2 -nographic
...
Debian GNU/Linux 4.0 debian-sparc ttyS0

debian-sparc login: root
Password: root
...
debian-sparc:~# cat <<EOF > /etc/apt/sources.list
deb http://archive.debian.org/debian/ etch main
deb-src http://archive.debian.org/debian/ etch main
deb http://archive.debian.org/debian-security/ etch/updates main contrib
EOF
debian-sparc:~# apt-get update
...
debian-sparc:~# apt-get dist-upgrade
...
debian-sparc:~# apt-get install gcc libc6-dev
...
debian-sparc:~# cat <<EOF > test.c
int main(int argc, char **argv)
{
int i[2];
int *p;

p = (int *)(((char *) &i[0]) + 2);
*p = 42;
}
EOF
debian-sparc:~# gcc test.c
debian-sparc:~# ./a.out
Bus error

--
Thomas Munro
http://www.enterprisedb.com