#0  0x00007f84d96c8dab in tcmalloc::FL_Next(void*) ()
No symbol table info available.
#1  0x00007f84d96c8f2c in tcmalloc::FL_Pop(void**) ()
No symbol table info available.
#2  0x00007f84dc563d63 in calloc ()
No symbol table info available.
#3  0x00007f84be6d77df in ?? ()
No symbol table info available.
#4  0x0000000000000000 in ?? ()
No symbol table info available.