我得到一个带有调用堆栈的运行时SIGBUS，如下所示：
--- called from signal handler with signal 10 (SIGBUS) ---
001279b8 allocate__t24__default_alloc_template2b0i0Ui (20, 20, 2fa3c0, 32, 0, 0
) + a4
00117380 __nw__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc
_template2b0i0_3RepUiUi (10, 10, 838e00, 0, 0, 0) + 14
001173c0 create__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_all
oc_template2b0i0_3RepUi (9, 9, 838e00, 9, 0, 0) + 24
00117784 replace__t12basic_string3ZcZt18string_char_traits1ZcZt24__default_allo
c_template2b0i0UiUiPCcUi (fbf7f758, 0, ffffffff, fcbf40c2, 9, 80808080) + 114
0012b988 assign__t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc
_template2b0i0PCcUi (fbf7f758, fcbf40c2, 9, ffffffff, ffffffff, 20) + 24
0012a35c assign__t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc
_template2b0i0PCc (fbf7f758, fcbf40c2, 90, b0, 1ff0, 0) + 24
00127170 __t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_templ
ate2b0i0PCc (fbf7f758, fcbf40c2, fcbf40b8, 1c00, 9, 7c) + 28
可能是什么原因？ 堆栈溢出？堆上没有更多的空间？