=> 0x7f2531b3ea00 <backtrace_and_maps+58>:	add    %cl,0x63(%rcx)
   0x7f2531b3ea03 <backtrace_and_maps+61>:	fdivrl 0x1d(%rdx)
   0x7f2531b3ea09 <backtrace_and_maps+67>:	lea    0x16ddde(%rip),%rsi        # 0x7f2531cac7ee
   0x7f2531b3ea10 <backtrace_and_maps+74>:	mov    %rbx,%rdi
   0x7f2531b3ea13 <backtrace_and_maps+77>:	mov    $0x1,%eax
   0x7f2531b3ea18 <backtrace_and_maps+82>:	syscall 
   0x7f2531b3ea1a <backtrace_and_maps+84>:	cmp    $0xfffffffffffff000,%rax
   0x7f2531b3ea20 <backtrace_and_maps+90>:	jbe    0x7f2531b3ea2e <backtrace_and_maps+104>
   0x7f2531b3ea22 <backtrace_and_maps+92>:	mov    0x3a344f(%rip),%rdx        # 0x7f2531ee1e78
   0x7f2531b3ea29 <backtrace_and_maps+99>:	neg    %eax
   0x7f2531b3ea2b <backtrace_and_maps+101>:	mov    %eax,%fs:(%rdx)
   0x7f2531b3ea2e <backtrace_and_maps+104>:	lea    -0x1(%r8),%esi
   0x7f2531b3ea32 <backtrace_and_maps+108>:	lea    0x8(%rbp),%rdi
   0x7f2531b3ea36 <backtrace_and_maps+112>:	mov    %r12d,%edx
   0x7f2531b3ea39 <backtrace_and_maps+115>:	callq  0x7f2531c34990 <__GI___backtrace_symbols_fd>
   0x7f2531b3ea3e <backtrace_and_maps+120>:	mov    $0x1d,%edx