Re: Openmp sections

[Christoph Bartoschek <bartoschek@gmx.de>]

I have changed the code to

#pragma omp parallel sections 

But now I get an SIGILL.

Here is the console log:

-bash-3.00$ LANG=C gdb ./a.out
GNU gdb 6.6
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This GDB was configured as "x86_64-unknown-linux-gnu"...
Using host libthread_db library "/lib64/tls/libthread_db.so.1".
(gdb) run
Starting program: /lfs/user/bartosch/cg/a.out
[Thread debugging using libthread_db enabled]
[New Thread 182898459584 (LWP 16540)]
1
8
[New Thread 1084229984 (LWP 16543)]
[New Thread 1094719840 (LWP 16544)]
[New Thread 1105209696 (LWP 16545)]
[New Thread 1115699552 (LWP 16546)]
[New Thread 1126189408 (LWP 16547)]
[New Thread 1136679264 (LWP 16548)]
[New Thread 1147169120 (LWP 16549)]

Program received signal SIGILL, Illegal instruction.
[Switching to Thread 1094719840 (LWP 16544)]
0x0000000000400a93 in main.omp_fn.0 (.omp_data_i=0x0) at ga.C:10
10      #pragma omp parallel sections
(gdb) where
#0  0x0000000000400a93 in main.omp_fn.0 (.omp_data_i=0x0) at ga.C:10
#1  0x0000002a9555b635 in gomp_thread_start (xdata=<value optimized out>) 
at ../../../gcc-4.3.0/libgomp/team.c:108
#2  0x0000003e90c0610a in start_thread () from /lib64/tls/libpthread.so.0
#3  0x0000003e8fdc68c3 in clone () from /lib64/tls/libc.so.6
#4  0x0000000000000000 in ?? ()
(gdb) wherei
Undefined command: "wherei".  Try "help".
(gdb) disassemble
Dump of assembler code for function main.omp_fn.0:
0x0000000000400a6e <main.omp_fn.0+0>:   push   %rbp
0x0000000000400a6f <main.omp_fn.0+1>:   mov    %rsp,%rbp
0x0000000000400a72 <main.omp_fn.0+4>:   sub    $0x20,%rsp
0x0000000000400a76 <main.omp_fn.0+8>:   mov    %rdi,0xffffffffffffffe8(%rbp)
0x0000000000400a7a <main.omp_fn.0+12>:  mov    $0x2,%edi
0x0000000000400a7f <main.omp_fn.0+17>:  callq  0x400900 
<GOMP_sections_start@plt>
0x0000000000400a84 <main.omp_fn.0+22>:  mov    %eax,0xffffffffffffffe4(%rbp)
0x0000000000400a87 <main.omp_fn.0+25>:  cmpl   $0x1,0xffffffffffffffe4(%rbp)
0x0000000000400a8b <main.omp_fn.0+29>:  je     0x400aa2 <main.omp_fn.0+52>
0x0000000000400a8d <main.omp_fn.0+31>:  cmpl   $0x2,0xffffffffffffffe4(%rbp)
0x0000000000400a91 <main.omp_fn.0+35>:  je     0x400a95 <main.omp_fn.0+39>
0x0000000000400a93 <main.omp_fn.0+37>:  ud2a
0x0000000000400a95 <main.omp_fn.0+39>:  movl   $0x0,0xfffffffffffffff8(%rbp)
0x0000000000400a9c <main.omp_fn.0+46>:  addl   $0x1,0xfffffffffffffff8(%rbp)
0x0000000000400aa0 <main.omp_fn.0+50>:  jmp    0x400a9c <main.omp_fn.0+46>
0x0000000000400aa2 <main.omp_fn.0+52>:  movl   $0x0,0xfffffffffffffffc(%rbp)
0x0000000000400aa9 <main.omp_fn.0+59>:  addl   $0x1,0xfffffffffffffffc(%rbp)
0x0000000000400aad <main.omp_fn.0+63>:  jmp    0x400aa9 <main.omp_fn.0+59>
End of assembler dump.
(gdb)