Re: cygwn 5.19 with X-win bootstrap

[djh]

> From: Eli Zaretskii <address@hidden>
> .....
> No, I think it's a bug that happens only with optimised code.
> ....
> What happens if you repeatedly type "step" until you find yourself in
> some Emacs function?  Once you get to an Emacs function, "bt" should
> work correctly, and even if it doesn't, we will know in what place
> Emacs crashes.
> 

Here is the result:
Using gdb and stepping through: I was using the 'n' command and the <RET> to 
continue repeating it.

-------------------------------- start of gdb session 
cvs/emacs/lisp $   gdb ../src/bootstrap-emacs.exe
(gdb) b 855
Breakpoint 1 at 0x200a23c2: file emacs.c, line 855.
(gdb) run -batch --no-site-file --multibyte -f batch-byte-compile-if-not-done  
byte-opt.el

858       if (!initialized)
(gdb) n
851       char *junk = 0;
(gdb)
858       if (!initialized)
(gdb)
883       sort_args (argc, argv);
(gdb)
884       argc = 0;
(gdb)
885       while (argv[argc]) argc++;
(gdb)
887       if (argmatch (argv, argc, "-version", "--version", 3, NULL, 
&skip_args)
(gdb)
1006      if (1
(gdb)
1021          newlim = re_max_failures * ratio + 200000;
(gdb)
1018          ratio += ratio / 3;
(gdb)
1021          newlim = re_max_failures * ratio + 200000;
(gdb)
1029          if (newlim > rlim.rlim_max)
(gdb)
1035          if (rlim.rlim_cur < newlim)
(gdb)
1036            rlim.rlim_cur = newlim;
(gdb)
1038          setrlimit (RLIMIT_STACK, &rlim);
(gdb)
1043      stack_bottom = &stack_bottom_variable;
(gdb)
1050      clearerr (stdin);
(gdb)
1054      memory_warnings (0, malloc_warning);
(gdb)
1050      clearerr (stdin);
(gdb)
1054      memory_warnings (0, malloc_warning);
(gdb)
1058      free (realloc (malloc (4), 4));
(gdb)
1062      uninterrupt_malloc ();
(gdb)

Program received signal SIGSEGV, Segmentation fault.
0x610ad945 in pthread_mutexattr_init () from /usr/bin/cygwin1.dll
(gdb)
Single stepping until exit from function pthread_mutexattr_init,
which has no line number information.
0x7c94eaf0 in ?? () from ntdll.dll
(gdb)
Cannot find bounds of current function

---------------------- end of gdb output  ----------