[Bug libgcc/56101] New: pthread program abort

[Bug libgcc/56101] New: pthread program abort

[ryang at synopsys dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56101

             Bug #: 56101
           Summary: pthread program abort
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: libgcc
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ryang@synopsys.com


Created attachment 29269
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29269
The preprocessed file

-Compiler informations:
g++ -v
Using built-in specs.
COLLECT_GCC=/remote/depotsrc/depotsrc/amd64-2.6/local_install/gcc-4.7.2_test2/bin/g++
COLLECT_LTO_WRAPPER=/remote/depotsrc/depotsrc/amd64-2.6/local_install/gcc-4.7.2_test2/libexec/gcc/x86_64-redhat-linux/4.7.2/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../../src/gcc-4.7.2/configure
--prefix=/remote/depotsrc/depotsrc/amd64-2.6/local_install/gcc-4.7.2_test2
--enable-bootstrap --enable-threads=posix --enable-checking=release
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-languages=c,c++,fortran --disable-libgcj --with-cpu=generic
--build=x86_64-redhat-linux
Thread model: posix
gcc version 4.7.2 (GCC)

- Command line triggers the bug:
ryang@sderh7 test2> mtest
Abort

- compiler outout:
/remote/depotsrc/depotsrc/amd64-2.6/local_install/gcc-4.7.2_test2/bin/g++ -I.
-Wall -Wextra -fno-strict-aliasing -fwrapv -m64 -c  -msse2 -mfpmath=sse 
-fno-omit-frame-pointer -fno-dollars-in-identifiers -save-temps -pthread -o
tmain.o tmain.C
/remote/depotsrc/depotsrc/amd64-2.6/local_install/gcc-4.7.2_test2/bin/g++
-static-libgcc -static-libstdc++  -o mtest tmain.o -pthread -lm -ldl

- the preprocessed file (*.i*)
see the attachment

[Bug libgcc/56101] pthread program abort

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56101

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-01-25
     Ever Confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-01-25 12:38:31 UTC ---
(In reply to comment #0)
> /remote/depotsrc/depotsrc/amd64-2.6/local_install/gcc-4.7.2_test2/bin/g++ -I.
> -Wall -Wextra -fno-strict-aliasing -fwrapv -m64 -c  -msse2 -mfpmath=sse 
> -fno-omit-frame-pointer -fno-dollars-in-identifiers -save-temps -pthread -o
> tmain.o tmain.C
> /remote/depotsrc/depotsrc/amd64-2.6/local_install/gcc-4.7.2_test2/bin/g++
> -static-libgcc -static-libstdc++  -o mtest tmain.o -pthread -lm -ldl

Most of these flags are irrelevant, only these are needed to reproduce it:

   -static-libgcc -static-libstdc++ -pthread

If either libgcc or libstdc++ is dynamically linked it doesn't abort

[Bug libgcc/56101] pthread program abort

[siddhesh at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56101

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |siddhesh at redhat dot com

--- Comment #2 from Siddhesh Poyarekar <siddhesh at redhat dot com> ---
It's because libpthread dynamically loads libgcc_s.so.1.  As a result there are
two copies of dwarf_reg_size_table, where one (the dynamic one) is initialized
and the other (the static one) is used, resulting in this crash.

[Bug libgcc/56101] pthread program abort

[siddhesh at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56101

--- Comment #3 from Siddhesh Poyarekar <siddhesh at redhat dot com> ---
Here's the simplified non-preprocessed test, since it's not a problem with the
compiler proper:

$ cat > tmain.C
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>

extern "C"
void *worker_thread(void *tap)
{
   int j[1] = { 0 }; 

   j[0] += *(int *)tap;

  pthread_exit(NULL);
  return NULL;
}

int main(void)
{
  pthread_t t;
  int targs;

  if (pthread_create(&t, NULL, worker_thread, &targs) != 0)
    exit(-1);

  return(pthread_join(t, NULL));
}

[Bug libgcc/56101] pthread program abort

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56101

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 55779 has been marked as a duplicate of this bug. ***

[Bug libgcc/56101] pthread program abort

[masahiko.kimoto at miraclelinux dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56101

Masahiko Kimoto <masahiko.kimoto at miraclelinux dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |masahiko.kimoto@miraclelinu
                   |                            |x.com

--- Comment #6 from Masahiko Kimoto <masahiko.kimoto at miraclelinux dot com> ---
In case of removing GCC runtime libraries(libgcc_s.so, libstdc++.so) from root
filesystem, especially required in embedded environment, this constrainti
annoys us.

Is there any workaround without using dlopen(libgcc_s) ?

According to our examination, it does not abort when all libraries are linked
statically by -static option of GCC.