.
Thread 1 (process 6847):
#0  0x00007fa0dbd6f060 in strlen () from /lib/libc.so.6
#1  0x00007fa0dbd3be1a in vfprintf () from /lib/libc.so.6
#2  0x00007fa0dbd3cd03 in ?? () from /lib/libc.so.6
#3  0x00007fa0dbd38660 in vfprintf () from /lib/libc.so.6
#4  0x00007fa0dbd41e38 in fprintf () from /lib/libc.so.6
#5  0x00000000004069b9 in ?? ()
#6  0x00007fa0dbd121c4 in __libc_start_main () from /lib/libc.so.6
#7  0x0000000000404cb9 in ?? ()
#8  0x00007fffe4cb11b8 in ?? ()
#9  0x0000000000000000 in ?? ()