(lldb) up 20

frame #40: 0x00007fff34227510 CoreFoundation`___CFXRegistrationPost_block_invoke + 63

CoreFoundation`___CFXRegistrationPost_block_invoke:

->  0x7fff34227510 <+63>: movq   %r14, %rdi

    0x7fff34227513 <+66>: callq  0x7fff34322514            ; symbol stub for: _Block_release

    0x7fff34227518 <+71>: movq   0x30(%rbx), %rdi

    0x7fff3422751c <+75>: movq   0x5b330f95(%rip), %rsi    ; "release"