c++ - clang 在 std::async 中因 char * 异常而崩溃
问题描述
使用 clang++ 编译以下代码时,我遇到了崩溃:
#include <future>
#include <iostream>
int main() {
auto job = [] { throw "failed"; };
auto f = std::async(std::launch::deferred, job);
try {
f.get();
} catch (const char *&e) {
std::cout << "boom! " << e << '\n';
}
}
我必须说我看不出有什么不好的,并且使用 g++ 编译并将 valgrind 传递给 resutling 二进制文件是可以的。
也就是说,在使用 clang 编译时:
clang++ sample.cpp -pthread -Wall -Werror
我没有收到任何错误,但 valgrind 抱怨:
==10241== Invalid read of size 8
==10241== at 0x401E74: main (in /tmp/a.out)
==10241== Address 0x5d67e90 is 0 bytes after a block of size 112 alloc'd
==10241== at 0x4C2EE3B: malloc (vg_replace_malloc.c:309)
==10241== by 0x4ECCE31: __cxa_allocate_dependent_exception (in /usr/lib64/libstdc++.so.6.0.25)
==10241== by 0x4ECDF46: std::rethrow_exception(std::__exception_ptr::exception_ptr) (in /usr/lib64/libstdc++.so.6.0.25)
==10241== by 0x405075: std::__basic_future<void>::_M_get_result() const (in /tmp/a.out)
==10241== by 0x404F6C: std::future<void>::get() (in /tmp/a.out)
==10241== by 0x401E10: main (in /tmp/a.out)
==10241==
boom! ==10241==
当我使用 libc++ 编译时,二进制文件崩溃:
clang++ -stdlib=libc++ sample.cpp -pthread -Wall -Werror
$ ./a.out
Segmentation fault (core dumped)
valgrind 说:
==10334==
==10334== Invalid read of size 8
==10334== at 0x401834: main (in /tmp/a.out)
==10334== Address 0x60c02a0 is 0 bytes after a block of size 128 alloc'd
==10334== at 0x4C3147C: memalign (vg_replace_malloc.c:908)
==10334== by 0x4C31589: posix_memalign (vg_replace_malloc.c:1072)
==10334== by 0x5121AA0: ??? (in /usr/lib64/libc++abi.so.1.0)
==10334== by 0x5123BFA: __cxa_rethrow_primary_exception (in /usr/lib64/libc++abi.so.1.0)
==10334== by 0x4E7D678: std::rethrow_exception(std::exception_ptr) (in /usr/lib64/libc++.so.1.0)
==10334== by 0x4E7E0F4: std::__1::__assoc_sub_state::copy() (in /usr/lib64/libc++.so.1.0)
==10334== by 0x4E7E425: std::__1::future<void>::get() (in /usr/lib64/libc++.so.1.0)
==10334== by 0x4017D0: main (in /tmp/a.out)
==10334==
==10334== Invalid read of size 1
==10334== at 0x4C32256: strlen (vg_replace_strmem.c:461)
==10334== by 0x403DA4: std::__1::char_traits<char>::length(char const*) (in /tmp/a.out)
==10334== by 0x40373B: std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<< <std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) (in /tmp/a.out)
==10334== by 0x40183F: main (in /tmp/a.out)
==10334== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==10334==
==10334==
==10334== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==10334== Access not within mapped region at address 0x0
==10334== at 0x4C32256: strlen (vg_replace_strmem.c:461)
==10334== by 0x403DA4: std::__1::char_traits<char>::length(char const*) (in /tmp/a.out)
==10334== by 0x40373B: std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<< <std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) (in /tmp/a.out)
==10334== by 0x40183F: main (in /tmp/a.out)
==10334== If you believe this happened as a result of a stack
==10334== overflow in your program's main thread (unlikely but
==10334== possible), you can try to increase the size of the
==10334== main thread stack using the --main-stacksize= flag.
==10334== The main thread stack size used in this run was 8388608.
boom! ==10334==
这里有什么问题?可以在异步中使用 const char * 异常吗?
附加信息:
$ clang++ --version
clang version 6.0.1 (tags/RELEASE_601/final)
更新:我用各种版本的clang进行了测试,它总是在clang中崩溃。最后测试的版本是 10.0.0,仍然崩溃...
解决方案
在安装 clang 之后,我与 nm 处于相同的情况(谁知道重新安装可能是一个解决方案)。至于未打印的消息“失败!”,我已通过将第 11 行替换为以下内容来修复:
} catch (const char* e) {
推荐阅读
- python - 如何从现有图在 networkx 中创建随机图?
- makefile - 需要检查 GNUmakefile 中是否存在标志
- django - Django 远程服务器正在运行,但我无法连接到本地 Web 浏览器中的管理界面
- python - 为什么在使用函数时只打印最后一个元素
- php - mcrypt_generic 是否容易受到 padding oracle 攻击?
- math - RYYB 图像的 RYB 和 RGB 颜色空间之间的转换
- arduino - 当我在 python 中使用 serial.tools.list_ports 检查串口时,为什么 Arduino 会重置?
- .net-core - EF Core 3.1 查询导致 InvalidOperationException Lambda 表达式在 Include 中使用无效
- reactjs - 如何在 React 中测试代码风格和标准?
- python - 如何在不实际键入变量的情况下删除多个变量?