
Invalid write of size 4
   at 0x........: main (signal2.c:17)
   by 0x........: __libc_start_main (...libc...)
   by 0x........: (within /.../tests/signal2)
   Address 0x........ is not stack'd, malloc'd or free'd

ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
malloc/free: in use at exit: 0 bytes in 0 blocks.
malloc/free: 0 allocs, 0 frees, 0 bytes allocated.
For a detailed leak analysis,  rerun with: --leak-check=yes
For counts of detected errors, rerun with: -v