几天来，我在 Xcode 7.3 中启动 Address Sanitizer 时遇到以下问题。当 Sanitizer 发现问题(实际上被文件抑制)时打印到 Xcode 控制台的错误消息:
==13392==WARNING: Can't write to symbolizer at fd 55
==13392==WARNING: Can't write to symbolizer at fd 55
==13392==WARNING: Can't write to symbolizer at fd 55
==13392==WARNING: Can't write to symbolizer at fd 55
==13392==WARNING: Failed to use and restart external symbolizer!
我在存储库中找到了错误消息，但仍然无法解释发生了什么。显然内部写入功能失败，但我不知道是什么原因造成的。有任何想法吗？
https://github.com/Microsoft/compiler-rt/blob/master/lib/sanitizer_common/sanitizer_symbolizer_process_libcdep.cc#L100
最佳答案
您的路径中缺少 ASAN。以下是在 Xcode 之外完成的，以查看我是否可以显示错误，如果路径未定义，这很容易。我的猜测是 XCode 找不到它正在查找的位置，或者在以下情况下 ASAN 路径未定义。
当您尝试此操作时，如果您从路径中添加和删除它，错误就会消失，但行号也会消失，即如果您想再次查看实际的错误消息，您需要使用
unset ASAN_SYMBOLIZER_PATH
不是
ASAN_SYMBOLIZER_PATH=
创建一个c程序如下...
int main(void){
int a[3];
a[3] = 4;
return 0;
}
编译它，请暂时忽略警告...
gcc -std=c11 -Wall -g3 -fno-omit-frame-pointer -fsanitize=address broken_asan_test.c
./a.out
你应该看到这样的东西......
=================================================================
==29192==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff5ad1052c at pc 0x000104eefe78 bp 0x7fff5ad104f0 sp 0x7fff5ad104e8
WRITE of size 4 at 0x7fff5ad1052c thread T0
#0 0x104eefe77 in atos[29193]: [fatal] 'pid_for_task' failed: (os/kern) failure (5) (+0x100000e77)
==29192==WARNING: Can't write to symbolizer at fd 3
#1 0x7fff940495ac in atos[29206]: [fatal] 'pid_for_task' failed: (os/kern) failure (5) (+0x35ac)
#2 0x0 (<unknown module>)
注意这一行
==29192==WARNING: Can't write to symbolizer at fd 3
更改为将符号添加到您的路径中...
export ASAN_SYMBOLIZER_PATH=/usr/local/Cellar/llvm/3.6.2/bin/llvm-symbolizer
并且错误消失了......
=================================================================
==29312==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff55ac450c at pc 0x00010a13be78 bp 0x7fff55ac44d0 sp 0x7fff55ac44c8
WRITE of size 4 at 0x7fff55ac450c thread T0
#0 0x10a13be77 in main (/git/ghub/doc/c/./a.out+0x100000e77)
#1 0x7fff940495ac in start (/usr/lib/system/libdyld.dylib+0x35ac)
#2 0x0 (<unknown module>)
关于clang - 地址 sanitizer 警告，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36475353/