Re: Threadsanitizer Detection on GM

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FYI, here attaches a tarball containing some other TSAN reports. "*.res"
are the reports, files without ".res" are the input however the behaviors
may be not the same across different runs.

Best Regards,
Hongxu


On Wed, Feb 6, 2019 at 2:45 AM Bob Friesenhahn <[email protected]>
wrote:

> On Wed, 6 Feb 2019, Hongxu Chen wrote:
> > WARNING: ThreadSanitizer: data race (pid=29974)
> >  Atomic write of size 8 at 0x7ffee84393b8 by thread T6:
> >    #0 __tsan_atomic64_fetch_add <null> (gm+0x476040)
> >    #1 .omp_outlined. /home/exp/work/gm/GM-tsan/magick/gradient.c:123:7
>
> The 'row_count' stack variable is declared to be omp shared and
> updated under the apparent protection of a 'pragma omp atomic' so I am
> curious if there is an actual problem here.  Is there some code change
> (e.g. a 'pragma omp flush (row_count)') which makes the reported issue
> go away?
>
> > I'm trying some concurrent detection techniques, so I can try GM versions
> > prior to 1.3.31,
> > so thanks for this tip!
>
> It would be interesting to see the difference.
>
> Ultimately, well-tested patches which solve problems are most useful.
>
> Bob
> --
> Bob Friesenhahn
> [email protected], http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt
>
>
> _______________________________________________
> Graphicsmagick-bugs mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/graphicsmagick-bugs
>

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<div dir=3D"ltr">FYI, here attaches a tarball containing some other TSAN re=
ports. &quot;*.res&quot; are the reports, files without &quot;.res&quot; ar=
e the input however the behaviors may be not the same across different runs=
.<div><br><div><div><div><div dir=3D"ltr" class=3D"gmail_signature" data-sm=
artmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><font co=
lor=3D"#313131" face=3D"Arial, sans-serif"><span style=3D"font-size:12px">B=
est Regards,</span></font><div><font color=3D"#313131" face=3D"Arial, sans-=
serif"><span style=3D"font-size:12px">Hongxu</span></font></div></div></div=
></div></div></div><br></div></div></div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Feb 6, 2019 at 2:45 AM Bob=
 Friesenhahn &lt;<a href=3D"mailto:[email protected]">bfriesen@s=
imple.dallas.tx.us</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex">On Wed, 6 Feb 2019, Hongxu Chen wrote:<br>
&gt; WARNING: ThreadSanitizer: data race (pid=3D29974)<br>
&gt;=C2=A0 Atomic write of size 8 at 0x7ffee84393b8 by thread T6:<br>
&gt;=C2=A0 =C2=A0 #0 __tsan_atomic64_fetch_add &lt;null&gt; (gm+0x476040)<b=
r>
&gt;=C2=A0 =C2=A0 #1 .omp_outlined. /home/exp/work/gm/GM-tsan/magick/gradie=
nt.c:123:7<br>
<br>
The &#39;row_count&#39; stack variable is declared to be omp shared and <br=
>
updated under the apparent protection of a &#39;pragma omp atomic&#39; so I=
 am <br>
curious if there is an actual problem here.=C2=A0 Is there some code change=
 <br>
(e.g. a &#39;pragma omp flush (row_count)&#39;) which makes the reported is=
sue <br>
go away?<br>
<br>
&gt; I&#39;m trying some concurrent detection techniques, so I can try GM v=
ersions<br>
&gt; prior to 1.3.31,<br>
&gt; so thanks for this tip!<br>
<br>
It would be interesting to see the difference.<br>
<br>
Ultimately, well-tested patches which solve problems are most useful.<br>
<br>
Bob<br>
-- <br>
Bob Friesenhahn<br>
<a href=3D"mailto:[email protected]" target=3D"_blank">bfriesen@=
simple.dallas.tx.us</a>, <a href=3D"http://www.simplesystems.org/users/bfri=
esen/" rel=3D"noreferrer" target=3D"_blank">http://www.simplesystems.org/us=
ers/bfriesen/</a><br>
GraphicsMagick Maintainer,=C2=A0 =C2=A0 <a href=3D"http://www.GraphicsMagic=
k.org/" rel=3D"noreferrer" target=3D"_blank">http://www.GraphicsMagick.org/=
</a><br>
Public Key,=C2=A0 =C2=A0 =C2=A0<a href=3D"http://www.simplesystems.org/user=
s/bfriesen/public-key.txt" rel=3D"noreferrer" target=3D"_blank">http://www.=
simplesystems.org/users/bfriesen/public-key.txt</a><br>
<br>
<br>
_______________________________________________<br>
Graphicsmagick-bugs mailing list<br>
<a href=3D"mailto:[email protected]" target=3D"_bla=
nk">[email protected]</a><br>
<a href=3D"https://lists.sourceforge.net/lists/listinfo/graphicsmagick-bugs=
" rel=3D"noreferrer" target=3D"_blank">https://lists.sourceforge.net/lists/=
listinfo/graphicsmagick-bugs</a><br>
</blockquote></div>

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