Android libcorkscrew给出了奇怪的回溯

Question

我在sigaction中使用libcorkscrew来获取Android上的回溯（是的，我知道libcorkscrew没有公开暴露）。

我可以从libcorkscrew获得回溯但是它给了我奇怪/不完整的结果。

我忘记了什么吗？

以下是我的工作：

typedef struct map_info_t map_info_t;

typedef struct {
    uintptr_t absolute_pc;
    uintptr_t stack_top;
    size_t stack_size;
} backtrace_frame_t;

typedef struct {
    uintptr_t relative_pc;
    uintptr_t relative_symbol_addr;
    char* map_name;
    char* symbol_name;
    char* demangled_name;
} backtrace_symbol_t;

typedef ssize_t (*t_unwind_backtrace_signal_arch)(siginfo_t* si, void* sc, const map_info_t* lst, backtrace_frame_t* bt, size_t ignore_depth, size_t max_depth);
static t_unwind_backtrace_signal_arch unwind_backtrace_signal_arch;

typedef map_info_t* (*t_acquire_my_map_info_list)();
static t_acquire_my_map_info_list acquire_my_map_info_list;

typedef void (*t_release_my_map_info_list)(map_info_t* milist);
static t_release_my_map_info_list release_my_map_info_list;

typedef void (*t_get_backtrace_symbols)(const backtrace_frame_t* backtrace, size_t frames, backtrace_symbol_t* symbols);
static t_get_backtrace_symbols get_backtrace_symbols;

typedef void (*t_free_backtrace_symbols)(backtrace_symbol_t* symbols, size_t frames);
static t_free_backtrace_symbols free_backtrace_symbols;

void nativeCrashHandler_sigaction(int signal, struct siginfo *siginfo, void *sigcontext) {

    if (old_sa[signal].sa_handler)
        old_sa[signal].sa_handler(signal);

    if (unwind_backtrace_signal_arch != NULL)  {
        map_info_t *map_info = acquire_my_map_info_list();
        backtrace_frame_t frames[256] = {0,};
        backtrace_symbol_t symbols[256] = {0,};
        const ssize_t size = unwind_backtrace_signal_arch(siginfo, sigcontext, map_info, frames, 1, 255);
        get_backtrace_symbols(frames,  size, symbols);
        for (int i = 0; i < size; ++i)
            __android_log_print(ANDROID_LOG_ERROR, "DUMP", "%s", (symbols[i].demangled_name ? symbols[i].demangled_name : symbols[i].symbol_name));
        free_backtrace_symbols(symbols, size);
        release_my_map_info_list(map_info);
    }
}