(lldb) target create "nextstep/Emacs.app/Contents/MacOS/Emacs"
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/opt/brew/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 52, in <module>
    import weakref
  File "/opt/brew/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/weakref.py", line 14, in <module>
    from _weakref import (
ImportError: cannot import name _remove_dead_weakref
Current executable set to 'nextstep/Emacs.app/Contents/MacOS/Emacs' (x86_64).
(lldb) b emacs.c:848
Breakpoint 1: where = Emacs`main + 1489 at emacs.c:848, address = 0x000000010014f431
(lldb) run -Q
Process 97130 launched: '/Users/kostya/Downloads/emacs-master.git/nextstep/Emacs.app/Contents/MacOS/Emacs' (x86_64)
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x000000010014f431 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:848
   845    if (getrlimit (RLIMIT_STACK, &rlim) == 0
   846        && 0 <= rlim.rlim_cur && rlim.rlim_cur <= LONG_MAX)
   847      {
-> 848        rlim_t lim = rlim.rlim_cur;
   849
   850        /* Approximate the amount regex-emacs.c needs per unit of
   851           emacs_re_max_failures, then add 33% to cover the size of the
Target 0: (Emacs) stopped.
(lldb) e lim
(rlim_t) $0 = 0
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f43f Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:854
   851           emacs_re_max_failures, then add 33% to cover the size of the
   852           smaller stacks that regex-emacs.c successively allocates and
   853           discards on its way to the maximum.  */
-> 854        int min_ratio = 20 * sizeof (char *);
   855        int ratio = min_ratio + min_ratio / 3;
   856
   857        /* Extra space to cover what we're likely to use for other
Target 0: (Emacs) stopped.
(lldb) e lim
(rlim_t) $1 = 67104768
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f449 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:855
   852           smaller stacks that regex-emacs.c successively allocates and
   853           discards on its way to the maximum.  */
   854        int min_ratio = 20 * sizeof (char *);
-> 855        int ratio = min_ratio + min_ratio / 3;
   856
   857        /* Extra space to cover what we're likely to use for other
   858           reasons.  For example, a typical GC might take 30K stack
Target 0: (Emacs) stopped.
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f478 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:860
   857        /* Extra space to cover what we're likely to use for other
   858           reasons.  For example, a typical GC might take 30K stack
   859           frames.  */
-> 860        int extra = (30 * 1000) * 50;
   861
   862        bool try_to_grow_stack = true;
   863  #ifndef CANNOT_DUMP
Target 0: (Emacs) stopped.
(lldb) e min_ratio
(int) $2 = 160
(lldb) e ratio
(int) $3 = 213
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f482 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:862
   859           frames.  */
   860        int extra = (30 * 1000) * 50;
   861
-> 862        bool try_to_grow_stack = true;
   863  #ifndef CANNOT_DUMP
   864        try_to_grow_stack = !noninteractive || initialized;
   865  #endif
Target 0: (Emacs) stopped.
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f489 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:864
   861
   862        bool try_to_grow_stack = true;
   863  #ifndef CANNOT_DUMP
-> 864        try_to_grow_stack = !noninteractive || initialized;
   865  #endif
   866
   867        if (try_to_grow_stack)
Target 0: (Emacs) stopped.
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f4bd Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:867
   864        try_to_grow_stack = !noninteractive || initialized;
   865  #endif
   866
-> 867        if (try_to_grow_stack)
   868          {
   869            rlim_t newlim = emacs_re_max_failures * ratio + extra;
   870
Target 0: (Emacs) stopped.
(lldb) e try_to_grow_stack
(bool) $4 = true
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f4d1 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:869
   866
   867        if (try_to_grow_stack)
   868          {
-> 869            rlim_t newlim = emacs_re_max_failures * ratio + extra;
   870
   871            /* Round the new limit to a page boundary; this is needed
   872               for Darwin kernel 15.4.0 (see Bug#23622) and perhaps
Target 0: (Emacs) stopped.
(lldb) e emacs_re_max_failures
(size_t) $5 = 6500256977556508423
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f4f0 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:878
   875               RLIM_INFINITY etc. since in practice when they are
   876               nonnegative they are so large that the code does the
   877               right thing anyway.  */
-> 878            long pagesize = getpagesize ();
   879            newlim += pagesize - 1;
   880            if (0 <= rlim.rlim_max && rlim.rlim_max < newlim)
   881              newlim = rlim.rlim_max;
Target 0: (Emacs) stopped.
(lldb) e newlim
(rlim_t) $6 = 10020000
(lldb) e emacs_re_max_failures
(size_t) $7 = 6500256977556508423
(lldb) e ratio
(int) $8 = 213
(lldb) e emacs_re_max_failures * ratio
(unsigned long) $9 = 1048930691319922899
(lldb) e emacs_re_max_failures * ratio + extra
(unsigned long) $10 = 1048930691321422899
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f503 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:879
   876               nonnegative they are so large that the code does the
   877               right thing anyway.  */
   878            long pagesize = getpagesize ();
-> 879            newlim += pagesize - 1;
   880            if (0 <= rlim.rlim_max && rlim.rlim_max < newlim)
   881              newlim = rlim.rlim_max;
   882            newlim -= newlim % pagesize;
Target 0: (Emacs) stopped.
(lldb) e pagesize
(long) $11 = 4096
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f51c Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:880
   877               right thing anyway.  */
   878            long pagesize = getpagesize ();
   879            newlim += pagesize - 1;
-> 880            if (0 <= rlim.rlim_max && rlim.rlim_max < newlim)
   881              newlim = rlim.rlim_max;
   882            newlim -= newlim % pagesize;
   883
Target 0: (Emacs) stopped.
(lldb) e newlim
(rlim_t) $12 = 10024095
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f54b Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:882
   879            newlim += pagesize - 1;
   880            if (0 <= rlim.rlim_max && rlim.rlim_max < newlim)
   881              newlim = rlim.rlim_max;
-> 882            newlim -= newlim % pagesize;
   883
   884            if (pagesize <= newlim - lim)
   885              {
Target 0: (Emacs) stopped.
(lldb) e rlim.rlim_max
(rlim_t) $13 = 67104768
(lldb) e newlim
(rlim_t) $14 = 10024095
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f56e Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:884
   881              newlim = rlim.rlim_max;
   882            newlim -= newlim % pagesize;
   883
-> 884            if (pagesize <= newlim - lim)
   885              {
   886                rlim.rlim_cur = newlim;
   887                if (setrlimit (RLIMIT_STACK, &rlim) == 0)
Target 0: (Emacs) stopped.
(lldb) e newlim
(rlim_t) $15 = 10022912
(lldb) e newlim - lim
(unsigned long long) $16 = 18446744073652469760
(lldb) e lim
(rlim_t) $17 = 67104768
(lldb) e newlim
(rlim_t) $18 = 10022912
(lldb) e pagesize
(long) $19 = 4096
(lldb) e newlim
(rlim_t) $20 = 10022912
(lldb) e lim
(rlim_t) $21 = 67104768
(lldb) e newlim - lim
(unsigned long long) $22 = 18446744073652469760
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f598 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:886
   883
   884            if (pagesize <= newlim - lim)
   885              {
-> 886                rlim.rlim_cur = newlim;
   887                if (setrlimit (RLIMIT_STACK, &rlim) == 0)
   888                  lim = newlim;
   889              }
Target 0: (Emacs) stopped.
(lldb) e newlim
(rlim_t) $23 = 10022912
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f5a6 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:887
   884            if (pagesize <= newlim - lim)
   885              {
   886                rlim.rlim_cur = newlim;
-> 887                if (setrlimit (RLIMIT_STACK, &rlim) == 0)
   888                  lim = newlim;
   889              }
   890          }
Target 0: (Emacs) stopped.
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f5b4 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:888
   885              {
   886                rlim.rlim_cur = newlim;
   887                if (setrlimit (RLIMIT_STACK, &rlim) == 0)
-> 888                  lim = newlim;
   889              }
   890          }
   891        /* If the stack is big enough, let regex-emacs.c more of it before
Target 0: (Emacs) stopped.
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f5c2 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:889
   886                rlim.rlim_cur = newlim;
   887                if (setrlimit (RLIMIT_STACK, &rlim) == 0)
   888                  lim = newlim;
-> 889              }
   890          }
   891        /* If the stack is big enough, let regex-emacs.c more of it before
   892           falling back to heap allocation.  */
Target 0: (Emacs) stopped.
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f5c7 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:890
   887                if (setrlimit (RLIMIT_STACK, &rlim) == 0)
   888                  lim = newlim;
   889              }
-> 890          }
   891        /* If the stack is big enough, let regex-emacs.c more of it before
   892           falling back to heap allocation.  */
   893        emacs_re_safe_alloca = max
Target 0: (Emacs) stopped.
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f5cc Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:893
   890          }
   891        /* If the stack is big enough, let regex-emacs.c more of it before
   892           falling back to heap allocation.  */
-> 893        emacs_re_safe_alloca = max
   894          (min (lim - extra, SIZE_MAX) * (min_ratio / ratio),
   895           MAX_ALLOCA);
   896      }
Target 0: (Emacs) stopped.
(lldb) e emacs_re_safe_alloca
(ptrdiff_t) $24 = 4435280473597425792
(lldb) n
Process 97130 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x000000010014f701 Emacs`main(argc=2, argv=0x00007ffeefbff518) at emacs.c:899
   896      }
   897  #endif /* HAVE_SETRLIMIT and RLIMIT_STACK and not CYGWIN */
   898
-> 899    clearerr_unlocked (stdin);
   900
   901    emacs_backtrace (-1);
   902
Target 0: (Emacs) stopped.
(lldb) e emacs_re_safe_alloca
(ptrdiff_t) $25 = 4435280473597425792
(lldb) c
Process 97130 resuming
2018-10-02 15:38:55.115287-0700 Emacs[97130:1949757] MessageTracer: Falling back to default whitelist
2018-10-02 15:38:55.225413-0700 Emacs[97130:2016511] flock failed to lock maps file: errno = 35
2018-10-02 15:38:55.227137-0700 Emacs[97130:2016511] flock failed to lock maps file: errno = 35
Process 97130 exited with status = 0 (0x00000000)