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lisa@jjl bt % lldb -- ./runner ./float
(lldb) target create "./runner"
Current executable set to '/Users/lisa/bt/runner' (arm64).
(lldb) settings set -- target.run-args  "./float"
(lldb) r
Process 9182 launched: '/Users/lisa/bt/runner' (arm64)
Process 9182 stopped
* thread #2, stop reason = exec
    frame #0: 0x00007ffdfffbc3ec runtime`_mh_execute_header + 17388
runtime`_mh_execute_header:
->  0x7ffdfffbc3ec <+17388>: mov    x19, sp
    0x7ffdfffbc3f0 <+17392>: and    sp, x19, #0xfffffffffffffff0
    0x7ffdfffbc3f4 <+17396>: mov    x29, sp
    0x7ffdfffbc3f8 <+17400>: ldr    x20, [x19, #0x20]
Target 0: (runtime) stopped.
(lldb) watchpoint set expression 0x7ffdfffbc3f0    ====> set a watchpoint that won't hit
Watchpoint created: Watchpoint 1: addr = 0x7ffdfffbc3f0 size = 8 state = enabled ...
    new value: -7998388550590730625
(lldb) c
Process 9182 resuming
rosetta error: failed to allocate vm space for aot   =========> will cause such failure
Process 9182 stopped
* thread #2, stop reason = signal SIGTRAP
    frame #0: 0x00007ffdfffd4d38 runtime`_mh_execute_header + 118072
runtime`_mh_execute_header:
->  0x7ffdfffd4d38 <+118072>: brk    #0x1
    0x7ffdfffd4d3c <+118076>: stp    x20, x19, [sp, #-0x20]!
    0x7ffdfffd4d40 <+118080>: stp    x29, x30, [sp, #0x10]
    0x7ffdfffd4d44 <+118084>: add    x29, sp, #0x10            ; =0x10 
Target 0: (runtime) stopped.
(lldb) 

isa@jjl bt % lldb -- ./runner ./lazy  ===> lazy has a dead loop in main()
(lldb) target create "./runner"
Current executable set to '/Users/lisa/bt/runner' (arm64).
(lldb) settings set -- target.run-args  "./lazy"
(lldb) r
Process 9235 launched: '/Users/lisa/bt/runner' (arm64)
Process 9235 stopped
* thread #2, stop reason = exec
    frame #0: 0x00007ffdfffbc3ec runtime`_mh_execute_header + 17388
runtime`_mh_execute_header:
->  0x7ffdfffbc3ec <+17388>: mov    x19, sp
    0x7ffdfffbc3f0 <+17392>: and    sp, x19, #0xfffffffffffffff0
    0x7ffdfffbc3f4 <+17396>: mov    x29, sp
    0x7ffdfffbc3f8 <+17400>: ldr    x20, [x19, #0x20]
Target 0: (runtime) stopped.
(lldb) c
Process 9235 resuming
Process 9235 stopped              ====> type ctrl+c to stop in the main function of lazy
* thread #2, stop reason = signal SIGSTOP
    frame #0: 0x0000000100011018
->  0x100011018: ldur   w0, [x5, #-0x8]
    0x10001101c: cmp    w0, #0x0                  ; =0x0 
    0x100011020: b.eq   0x100011028
    0x100011024: b      0x100011018
Target 0: (runtime) stopped.
(lldb) si        ========> stuck here