[cfe-dev] libc++ and libc++abi problem with stdexcept on linux

[Ben Pope]

Hi,

I've got libc++ linked with libc++abi, but I'm having a problem within
stdexcept, it seems to be mixing up the __libcpp_nmstr from libc++ with
that from libc++abi.

I built trunk libc++ and libc++abi on Ubuntu 13.10 with:
CC=clang-3.4 CXX=clang++-3.4 cmake -G "Unix Makefiles"
-DLIBCXX_CXX_ABI=libcxxabi
-DLIBCXX_LIBCXXABI_INCLUDE_PATHS="../../libcxxabi/include"
-DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr ../


The following code reproduces this:

#include <stdexcept>

int main()
{
   try { throw std::runtime_error("Foo"); }
   catch (std::exception const&) {}
}

clang++-3.4 -fsanitize=address -std=c++11 -stdlib=libc++ -lc++abi
teststdexcept.cpp -o teststdexcept

And the output of ASan:

=================================================================
==12336==ERROR: AddressSanitizer: alloc-dealloc-mismatch (operator new
[] vs operator delete) on 0x60300000efe0
    #0 0x466019 in operator delete(void*)
/home/ben/development/llvm/3.4/final/llvm.src/projects/compiler-rt/lib/asan/asan_new_delete.cc:83
    #1 0x7f6cbbbca550 in ~__libcpp_nmstr
/home/ben/development/llvm/trunk/libcxxabi/lib/../src/stdexcept.cpp:123
    #2 0x7f6cbbbca550 in std::overflow_error::~overflow_error()
/home/ben/development/llvm/trunk/libcxxabi/lib/../src/stdexcept.cpp:150
    #3 0x7f6cbbbc6d9d in __cxa_decrement_exception_refcount
/home/ben/development/llvm/trunk/libcxxabi/lib/../src/cxa_exception.cpp:519
    #4 0x7f6cbbbc6d9d in __cxa_end_catch
/home/ben/development/llvm/trunk/libcxxabi/lib/../src/cxa_exception.cpp:399
    #5 0x47bc1b in main (/home/ben/development/test/teststdexcept+0x47bc1b)
    #6 0x7f6cba9d9de4 in __libc_start_main
/build/buildd/eglibc-2.17/csu/libc-start.c:260
    #7 0x47b77c in _start
(/home/ben/development/test/teststdexcept+0x47b77c)

0x60300000efe0 is located 0 bytes inside of 28-byte region
[0x60300000efe0,0x60300000effc)
allocated by thread T0 here:
    #0 0x465dd9 in operator new[](unsigned long)
/home/ben/development/llvm/3.4/final/llvm.src/projects/compiler-rt/lib/asan/asan_new_delete.cc:54
    #1 0x7f6cbb02770c in std::runtime_error::runtime_error(char const*)
(/usr/lib/libc++.so.1+0x9170c)
    #2 0x7f6cba9d9de4 in __libc_start_main
/build/buildd/eglibc-2.17/csu/libc-start.c:260


Any ideas what went wrong?

Cheers,

Ben