> gdb ./real
> target remote | /usr/local/lib/valgrind/../../bin/vgdb --pid=23498
> continue

> After few seconds gdb says
>
>
> Program received signal SIGTRAP, Trace/breakpoint trap.
> 0x0000000006018417 in __libc_writev (fd=9, vector=0x6af6710, count=3) at 
> ../sysdeps/unix/sysv/linux/writev.c:50
> 50    ../sysdeps/unix/sysv/linux/writev.c: File o directory non esistente.
>
> where "non esistente" means "doesn't exist"

Please tell us the environment: which version of valgrind, which Linux 
distribution
and version, which hardware architecture, which version of gdb.

Then, what is the instruction stream near the address 0x0000000006018417 ?
Try these gdb commands:
        x/i $pc
        x/15i $pc - 0x20



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