gcc bug triggered by compiling R14B02 (not an erlang bug per se)

[Matthias Lang]

Hi,

This is not an Erlang bug, but rather a gcc bug tripped by building Erlang.

Building R14B02 on an x86-64 machine with gcc 4.5.2 (Debian "testing")
fails partway through with:

  beam/dist.c:501:1: internal compiler error: in dfs_enumerate_from, at cfganal.c:1207
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-4.5/README.Bugs> for instructions.

This looks like GCC bugs 48000 and 48060, though I'm not sure if they
apply to 4.5.2 or only to 4.6:

  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48000

I worked around it by using gcc 4.4 instead.

Matt
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[Mikael Pettersson-3]

Matthias Lang writes:
 > Hi,
 >
 > This is not an Erlang bug, but rather a gcc bug tripped by building Erlang.
 >
 > Building R14B02 on an x86-64 machine with gcc 4.5.2 (Debian "testing")
 > fails partway through with:
 >
 >   beam/dist.c:501:1: internal compiler error: in dfs_enumerate_from, at cfganal.c:1207
 >   Please submit a full bug report,
 >   with preprocessed source if appropriate.
 >   See <file:///usr/share/doc/gcc-4.5/README.Bugs> for instructions.

I'm unable to reproduce this with either gcc-4.5.2 or gcc-4.5-20110421,
both vanilla unpatched FSF sources, on an x86-64 box running Fedora 13.
Looks like a Debian bug to me.
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[Matthias Lang]

Hi,

> I'm unable to reproduce this with either gcc-4.5.2 or gcc-4.5-20110421,
> both vanilla unpatched FSF sources, on an x86-64 box running Fedora 13.
> Looks like a Debian bug to me.

Thanks, agree.

I glanced at Debian's patches, but they're 200k lines long. Did not
feel like digging through that to try and understand what they've
done. Feels like "report and forget" time.

Anything more than the rest of this mail I should send to Debian?

--------------------

gcc -v:  gcc version 4.5.2 (Debian 4.5.2-11)

uname -a: Linux contorpis.corelatus.se 2.6.38-2-amd64 #1 SMP Thu Apr 7 04:28:07 UTC 2011 x86_64 GNU/Linux

how to reproduce:

   cd /tmp
   wget www.corelatus.se/~matthias/preprocessed.i
   gcc -O3 -c preprocessed.i

here's what it looks like on my machine:

  >   gcc -O3 -c preprocessed.i
  beam/dist.c: In function ‘erts_do_net_exits’:
  beam/dist.c:501:1: internal compiler error: in dfs_enumerate_from, at cfganal.c:1207
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-4.5/README.Bugs> for instructions.

MD5: 616c74a08f57cb9263a9af62d845fb19  preprocessed.i

Problem does not occur with "gcc version 4.4.5 (Debian 4.4.5-15)"

Can't find a similar problem at bugs.debian.org.
Similar problem: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48000

Matt
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[Mikael Pettersson-3]

Matthias Lang writes:
 > Hi,
 >
 > > I'm unable to reproduce this with either gcc-4.5.2 or gcc-4.5-20110421,
 > > both vanilla unpatched FSF sources, on an x86-64 box running Fedora 13.
 > > Looks like a Debian bug to me.
 >
 > Thanks, agree.
 >
 > I glanced at Debian's patches, but they're 200k lines long. Did not
 > feel like digging through that to try and understand what they've
 > done. Feels like "report and forget" time.
 >
 > Anything more than the rest of this mail I should send to Debian?
 >
 > --------------------
 >
 > gcc -v:  gcc version 4.5.2 (Debian 4.5.2-11)

This bit looks incomplete.  'gcc -v' normally includes a list of
configuration options, that sometimes do matter.  Of course, Debian
should know what "4.5.2-11" means exactly, so it may not matter.
It would matter for bug reports to FSF GCC.

Apart from that, the bug report looks complete.

 >
 > uname -a: Linux contorpis.corelatus.se 2.6.38-2-amd64 #1 SMP Thu Apr 7 04:28:07 UTC 2011 x86_64 GNU/Linux
 >
 > how to reproduce:
 >
 >    cd /tmp
 >    wget www.corelatus.se/~matthias/preprocessed.i
 >    gcc -O3 -c preprocessed.i
 >
 > here's what it looks like on my machine:
 >
 >   >   gcc -O3 -c preprocessed.i
 >   beam/dist.c: In function ‘erts_do_net_exits’:
 >   beam/dist.c:501:1: internal compiler error: in dfs_enumerate_from, at cfganal.c:1207
 >   Please submit a full bug report,
 >   with preprocessed source if appropriate.
 >   See <file:///usr/share/doc/gcc-4.5/README.Bugs> for instructions.
 >
 > MD5: 616c74a08f57cb9263a9af62d845fb19  preprocessed.i
 >
 > Problem does not occur with "gcc version 4.4.5 (Debian 4.4.5-15)"
 >
 > Can't find a similar problem at bugs.debian.org.
 > Similar problem: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48000
 >
 > Matt




 >
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[Nico Kruber]

On Thursday 28 April 2011 09:29:26 Mikael Pettersson wrote:

> Matthias Lang writes:
>  > Hi,
>  >
>  > > I'm unable to reproduce this with either gcc-4.5.2 or
>  > > gcc-4.5-20110421, both vanilla unpatched FSF sources, on an x86-64
>  > > box running Fedora 13. Looks like a Debian bug to me.
>  >
>  > Thanks, agree.
>  >
>  > I glanced at Debian's patches, but they're 200k lines long. Did not
>  > feel like digging through that to try and understand what they've
>  > done. Feels like "report and forget" time.
>  >
>  > Anything more than the rest of this mail I should send to Debian?
>  >
>  > --------------------
>  >
>  > gcc -v:  gcc version 4.5.2 (Debian 4.5.2-11)
>
> This bit looks incomplete.  'gcc -v' normally includes a list of
> configuration options, that sometimes do matter.  Of course, Debian
> should know what "4.5.2-11" means exactly, so it may not matter.
> It would matter for bug reports to FSF GCC.
>
> Apart from that, the bug report looks complete.
>
>  > uname -a: Linux contorpis.corelatus.se 2.6.38-2-amd64 #1 SMP Thu Apr 7
>  > 04:28:07 UTC 2011 x86_64 GNU/Linux
>  >
>  > how to reproduce:
>  >    cd /tmp
>  >    wget www.corelatus.se/~matthias/preprocessed.i
>  >    gcc -O3 -c preprocessed.i
>  >
>  > here's what it looks like on my machine:
>  >   >   gcc -O3 -c preprocessed.i
>  >  
>  >   beam/dist.c: In function ‘erts_do_net_exits’:
>  >   beam/dist.c:501:1: internal compiler error: in dfs_enumerate_from, at
>  >   cfganal.c:1207 Please submit a full bug report,
>  >   with preprocessed source if appropriate.
>  >   See <file:///usr/share/doc/gcc-4.5/README.Bugs> for instructions.
>  >
>  > MD5: 616c74a08f57cb9263a9af62d845fb19  preprocessed.i
>  >
>  > Problem does not occur with "gcc version 4.4.5 (Debian 4.4.5-15)"
>  >
>  > Can't find a similar problem at bugs.debian.org.
>  > Similar problem: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48000
>  >
>  > Matt

This is not only a Debian problem. Happens on openSUSE Factory, too - but only on x86_64 - see
https://build.opensuse.org/package/rawlog?arch=x86_64&package=erlang&project=home%3Atschuett&repository=openSUSE_Factory

This error did not occur with R14B01 - but the GCC packages might have been different back then.
Does the error still occur with the GCC patch from the bug report you mentioned?

Nico

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[Nico Kruber]

On Thursday 05 May 2011 11:39:29 Nico Kruber wrote:

> On Thursday 28 April 2011 09:29:26 Mikael Pettersson wrote:
> > Matthias Lang writes:
> >  > Hi,
> >  >
> >  > > I'm unable to reproduce this with either gcc-4.5.2 or
> >  > > gcc-4.5-20110421, both vanilla unpatched FSF sources, on an x86-64
> >  > > box running Fedora 13. Looks like a Debian bug to me.
> >  >
> >  > Thanks, agree.
> >  >
> >  > I glanced at Debian's patches, but they're 200k lines long. Did not
> >  > feel like digging through that to try and understand what they've
> >  > done. Feels like "report and forget" time.
> >  >
> >  > Anything more than the rest of this mail I should send to Debian?
> >  >
> >  > --------------------
> >  >
> >  > gcc -v:  gcc version 4.5.2 (Debian 4.5.2-11)
> >
> > This bit looks incomplete.  'gcc -v' normally includes a list of
> > configuration options, that sometimes do matter.  Of course, Debian
> > should know what "4.5.2-11" means exactly, so it may not matter.
> > It would matter for bug reports to FSF GCC.
> >
> > Apart from that, the bug report looks complete.
> >
> >  > uname -a: Linux contorpis.corelatus.se 2.6.38-2-amd64 #1 SMP Thu Apr 7
> >  > 04:28:07 UTC 2011 x86_64 GNU/Linux
> >  >
> >  > how to reproduce:
> >  >    cd /tmp
> >  >    wget www.corelatus.se/~matthias/preprocessed.i
> >  >    gcc -O3 -c preprocessed.i
> >  >
> >  > here's what it looks like on my machine:
> >  >   >   gcc -O3 -c preprocessed.i
> >  >  
> >  >   beam/dist.c: In function ‘erts_do_net_exits’:
> >  >   beam/dist.c:501:1: internal compiler error: in dfs_enumerate_from,
> >  >   at cfganal.c:1207 Please submit a full bug report,
> >  >   with preprocessed source if appropriate.
> >  >   See <file:///usr/share/doc/gcc-4.5/README.Bugs> for instructions.
> >  >
> >  > MD5: 616c74a08f57cb9263a9af62d845fb19  preprocessed.i
> >  >
> >  > Problem does not occur with "gcc version 4.4.5 (Debian 4.4.5-15)"
> >  >
> >  > Can't find a similar problem at bugs.debian.org.
> >  > Similar problem: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48000
> >  >
> >  > Matt
>
> This is not only a Debian problem. Happens on openSUSE Factory, too - but
> only on x86_64 - see
> https://build.opensuse.org/package/rawlog?arch=x86_64&package=erlang&proje
> ct=home%3Atschuett&repository=openSUSE_Factory
>
> This error did not occur with R14B01

I need to correct this - apparently, the same error occurs in R14B
but there, it happens on both, i586 and x86_64! see:
https://build.opensuse.org/package/rawlog?arch=i586&package=erlang&project=devel%3Alanguages%3Aerlang&repository=openSUSE_Factory
https://build.opensuse.org/package/rawlog?arch=x86_64&package=erlang&project=devel%3Alanguages%3Aerlang&repository=openSUSE_Factory

> Does the error still occur with the GCC patch from
> the bug report you mentioned?

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[Matthias Lang]

On Thursday, May 05, Nico Kruber wrote:

> This error did not occur with R14B01 - but the GCC packages might
> have been different back then.
> Does the error still occur with the GCC patch from the bug report you mentioned?

I didn't try. I solved my immediate problem by going back to gcc-4.4.

I just checked the thread on the debian gcc bugs list where I reported
the problem along with the example to reproduce it. Crickets there.

Matt
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