[Bug c++/43818] New: internal compiler error: Segmentation fault

[Bug c++/43818] New: internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

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Hi,

unfortunately it's hard for me to tell whether this is the same as any of the
other segfault bugs, so I'll have to ask you to determine that for yourselves.

$ g++ -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.1-4ubuntu9'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu9) 

$ g++ -c -o bugtest.out -O2 bugtest.ii 
projects/odete/bugtest.cpp: In member function ‘bool
tBspTree2D::Intersect(const tVec2f&, const tVec2f&, tVec2f&, double) const
[with bool oriented = true]’:
projects/odete/bugtest.cpp:81: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.4/README.Bugs> for instructions.

I am about to attach bugtest.ii.


-- 
           Summary: internal compiler error: Segmentation fault
           Product: gcc
           Version: 4.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: oberlaender at fzi dot de
 GCC build triplet: i486-linux-gnu
  GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #1 from oberlaender at fzi dot de  2010-04-20 14:08 -------
Created an attachment (id=20443)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20443&action=view)
bugtest.ii to reproduce the segfault.

This is the preprocessed source file leading to the segfault, created using g++
-save-temps and gzip.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #2 from oberlaender at fzi dot de  2010-04-20 14:14 -------
The following is a list of changes to the code, each of which makes the
segfault disappear:

- Remove the max_len parameter from tBspTree2D::Intersect() and replace its use
by a constant
- Remove lines 44931 through 44936 from bugtest.ii
- Remove line 44955 (bool intersect_recursive = bsp->Intersect<true>(o, dir,
pr);)

I hope I didn't miss any important information you might still need.

Best wishes, Jan


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #3 from oberlaender at fzi dot de  2010-04-20 15:29 -------
The file bugtest.ii compiles successfully in gcc-4.3.4 (unfortunately I can't
go back to 4.3 though).

$ g++-4.3 -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.4-5ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--enable-nls --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr
--enable-targets=all --with-tune=generic --enable-checking=release
--build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.3.4 (Ubuntu 4.3.4-5ubuntu1) 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[redi at gcc dot gnu dot org]

------- Comment #4 from redi at gcc dot gnu dot org  2010-04-20 16:27 -------
works for me with 4.4.2 and higher - could you be running out of memory?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

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------- Comment #5 from oberlaender at fzi dot de  2010-04-20 16:51 -------
I don't think it's the memory, I've got 4 GB at my disposal (32-Bit system with
PAE kernel), and it doesn't seem to take up much memory:

$ uname -a
Linux delorean 2.6.31-20-generic-pae #58-Ubuntu SMP Fri Mar 12 06:25:51 UTC
2010 i686 GNU/Linux

$ free
             total       used       free     shared    buffers     cached
Mem:       3921840    2022788    1899052          0     380908    1064988
-/+ buffers/cache:     576892    3344948
Swap:      4294040          0    4294040

$ strace -emmap2,mremap,brk,setrlimit g++ -c -o bugtest.out -O2 bugtest.ii 
brk(0)                                  = 0x97a3000
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb781d000
mmap2(NULL, 139729, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb77fa000
mmap2(NULL, 1329512, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb76b5000
mmap2(0xb77f4000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13e) = 0xb77f4000
mmap2(0xb77f7000, 10600, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb77f7000
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb76b4000
brk(0)                                  = 0x97a3000
brk(0x97c4000)                          = 0x97c4000
mmap2(NULL, 1085056, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb75ab000
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb781c000
mmap2(NULL, 256316, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb756c000
mmap2(NULL, 26048, PROT_READ, MAP_SHARED, 3, 0) = 0xb7816000
mmap2(NULL, 52, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7815000
projects/odete/bugtest.cpp: In member function ‘bool
tBspTree2D::Intersect(const tVec2f&, const tVec2f&, tVec2f&, double) const
[with bool oriented = true]’:
projects/odete/bugtest.cpp:81: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.4/README.Bugs> for instructions.
--- SIGCHLD (Child exited) @ 0 (0) ---

I've also confirmed the same behavior on another system running the same OS and
gcc version, so my RAM is probably OK.

I'll try it with >=4.4.2 later.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

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------- Comment #6 from oberlaender at fzi dot de  2010-04-21 11:48 -------
A test with a g++-4.4.2 I built myself has the same problem:

$ g++-4.4.2 -c -o bugtest.out -O2 bugtest.ii 
projects/odete/bugtest.cpp: In member function ‘bool
tBspTree2D::Intersect(const tVec2f&, const tVec2f&, tVec2f&, double) const
[with bool oriented = true]’:
projects/odete/bugtest.cpp:81: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.4/README.Bugs> for instructions.

$ g++-4.4.2 -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../gcc-4.4.2/configure
--prefix=/home/oberlaen/local/stow/gcc-4.4.2/
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++ --enable-shared --disable-multiarch
--enable-linker-build-id --with-system-zlib --without-included-gettext
--enable-threads=posix --program-suffix=-4.4.2 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --disable-multilib --disable-werror --with-arch-32=i486
--with-tune=generic --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.4.2 (GCC) 

Jonathan, since 4.4.2 worked for you -- got any idea what could be different in
my case?  Am I doing something wrong?

I installed 4.4.2 with the regular ./configure <options as above>; make; make
install (into my $HOME/local), is there any risk of a mixup between 4.4.1 and
4.4.2?

Thanks in advance for your help.  I'll try 4.4.3 next...


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #7 from oberlaender at fzi dot de  2010-04-21 12:40 -------
4.4.3 gives me the same problem, I'm starting to think I'm really doing
something wrong.

$ g++-4.4.3 -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../gcc-4.4.3/configure
--prefix=/home/oberlaen/local/stow/gcc-4.4.3/
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++ --enable-shared --disable-multiarch
--enable-linker-build-id --with-system-zlib --without-included-gettext
--enable-threads=posix --program-suffix=-4.4.3 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --disable-multilib --disable-werror --with-arch-32=i486
--with-tune=generic --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.4.3 (GCC) 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #8 from oberlaender at fzi dot de  2010-04-21 13:42 -------
Just tested 4.5.0, which did not crash.

$ g++-4.5.0 -c -o bugtest.out -O2 bugtest.ii 
$ g++-4.5.0 -v
Using built-in specs.
COLLECT_GCC=g++-4.5.0
COLLECT_LTO_WRAPPER=/home/oberlaen/local/stow/gcc-4.5.0/libexec/gcc/i486-linux-gnu/4.5.0/lto-wrapper
Target: i486-linux-gnu
Configured with: ../gcc-4.5.0/configure
--prefix=/home/oberlaen/local/stow/gcc-4.5.0/
--with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs
--enable-languages=c,c++ --enable-shared --disable-multiarch
--enable-linker-build-id --with-system-zlib --without-included-gettext
--enable-threads=posix --program-suffix=-4.5.0 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --disable-multilib --disable-werror --with-arch-32=i486
--with-tune=generic --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu --with-mpc=/home/oberlaen/local
Thread model: posix
gcc version 4.5.0 (GCC) 

Also, all the 4.4.x versions work fine if I replace -O2 with -O1.

The question remains, what is going wrong with my various 4.4.x tests, and why
did it work for Jonathan?

I've circumvented the problem in my piece of software for now by going from -O2
to -O1, as I don't feel like rebuilding everything against 4.5 just yet. :) 
But at least according to my tests, the problem is present in all 4.4 releases.
 Can anyone else reproduce the error?

Thanks and best regards,
Jan


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[redi at gcc dot gnu dot org]

------- Comment #9 from redi at gcc dot gnu dot org  2010-04-21 16:24 -------
I tested on an x86_64 box (with -m32 because your preprocessed source was made
on a 32bit box so it was necessary) so I definitely have a lot more memory
available

I'm still thinking it's a problem with running out of memory, PAE doesn't
increase the total memory available to a single process


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #10 from oberlaender at fzi dot de  2010-04-22 07:47 -------
(In reply to comment #9)
> I'm still thinking it's a problem with running out of memory, PAE doesn't
> increase the total memory available to a single process

How would I find out if that is the issue?  The numbers reported by my strace
output seem harmless to me (but then I'm no expert with that tool).

I'm going to try and compile a debug version of gcc-4.4.3.  Will

 make STAGE2_CFLAGS="-g -O0" STAGE3_CFLAGS="-g -O0" all
 make install

produce the result I'm looking for?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #11 from oberlaender at fzi dot de  2010-04-22 07:59 -------
Created an attachment (id=20458)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20458&action=view)
Output of strace -F -emmap2,mremap,brk,setrlimit g++ -c -O2 bugtest.ii

Of course strace is pointless if I don't follow forks.  This strace output
follows cc1plus as well.  It still looks harmless to me though.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #12 from oberlaender at fzi dot de  2010-04-22 08:31 -------
(From update of attachment 20443)
Use a better MIME type.


-- 

oberlaender at fzi dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #20443|application/postscript      |application/octet-stream
          mime type|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #13 from oberlaender at fzi dot de  2010-04-22 09:13 -------
Created an attachment (id=20459)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20459&action=view)
Output from a gdb session on g++-4.4.3

OK, almost right.  I created a debug build for gcc-4.4.3:

$ g++-4.4.3 -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../gcc-4.4.3/configure
--prefix=/home/oberlaen/local/stow/gcc-4.4.3/
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++ --enable-shared --disable-multiarch
--enable-linker-build-id --with-system-zlib --without-included-gettext
--enable-threads=posix --program-suffix=-4.4.3 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --disable-multilib --disable-werror --with-arch-32=i486
--with-tune=generic --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.4.3 (GCC) 

I built with

 make CFLAGS="-g -O0" CXXFLAGS="-g -O0" STAGE2_CFLAGS="-g -O0"
STAGE3_CFLAGS="-g -O0"

I then ran g++-4.4.3 -save-temps -o bugtest.out -c -O2 bugtest.ii and extracted
the cc1plus command line through strace.  The attachment contains the results
from a gdb run on

 cc1plus -fpreprocessed bugtest.ii -quiet -dumpbase bugtest.ii -mtune=generic
-march=i486 -auxbase bugtest -O2 -o bugtest.s

Hope this tells you something.  Please tell me if I can get you any more info.

Best regards, Jan


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #14 from oberlaender at fzi dot de  2010-04-22 09:19 -------
(In reply to comment #13)

Oh, and another thing: at the moment of the segfault, memory usage says

$ ps v -C cc1plus
  PID TTY      STAT   TIME  MAJFL   TRS   DRS   RSS %MEM COMMAND
19072 pts/2    T      0:00      0 10015 36428 34760  0.8 <cc1plus...>


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[redi at gcc dot gnu dot org]

------- Comment #15 from redi at gcc dot gnu dot org  2010-04-22 10:50 -------
Thanks for the extra info - I can't reproduce it, but I can't test on a real
32bit host.  In the absence of any suggestions from anyone else, could you try
reconfiguring with --enable-checking=all instead of --enable-checking=release ?

That will enable some internal consistency checks, which make the compiler
slower but might reveal where it's going wrong.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[rguenth at gcc dot gnu dot org]

------- Comment #16 from rguenth at gcc dot gnu dot org  2010-04-22 11:25 -------
This has been fixed on the 4.4 branch, I can reproduce it with 4.4.3.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
      Known to fail|                            |4.4.3
      Known to work|                            |4.3.4 4.4.4 4.5.0
         Resolution|                            |FIXED
   Target Milestone|---                         |4.4.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #17 from oberlaender at fzi dot de  2010-04-22 15:48 -------
(In reply to comment #16)
> This has been fixed on the 4.4 branch, I can reproduce it with 4.4.3.

OK, thanks for the information.  I'm currently compiling gcc from the 4.4
branch in svn to verify.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818

[Bug c++/43818] internal compiler error: Segmentation fault

[oberlaender at fzi dot de]

------- Comment #18 from oberlaender at fzi dot de  2010-04-23 14:52 -------
(In reply to comment #17)
> (In reply to comment #16)
> > This has been fixed on the 4.4 branch, I can reproduce it with 4.4.3.
> 
> OK, thanks for the information.  I'm currently compiling gcc from the 4.4
> branch in svn to verify.

Just tested against the current SVN gcc-4_4-branch, which works fine.

Thanks for your help!


-- 

oberlaender at fzi dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |VERIFIED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43818