what is the function of EXCEPTIONS_SIGLONGJMP?

[John Smith]

hi:
   when I  debug gdb using gdb self ,  after I  type "start" command ,
 the prompt  is  as  below :
       Warning:
      Cannot insert breakpoint 0.
      Error accessing memory address 0xdb6a5194: /.
      0xb7589571 in siglongjmp () from /lib/i686/cmov/libc.so.6

 it seem to be some exceptions  happened  when  dealing with  break points  .

 and Is there some  interpret  here ?


thanks!