Martin Sebor wrote:
In a 12D build with the default gcc 4.1.0 on SuSE Linux Enterprise
Server 10 (x86_64), the following simple program abends with the
error below after upgrading the 4.1.3 library to 4.2.0:
I've enhanced the program to replace operators new and delete
and to print the value of the pointer. The enhanced test case
and the output obtained from a 12D build with gcc 3.4.6 on Red
Hat Enterprise Linux AS release 4 (Nahant Update 4) is below.
Interestingly, the 12d (32-bit) output with Sun C++ on Solaris
is fine.
$ cat t.cpp && LD_LIBRARY_PATH=../lib ./t
#include <cstdio>
#include <cstdlib>
#include <new>
#include <string>
int main ()
{
std::string s = "a";
}
void* operator new (std::size_t n) throw (std::bad_alloc)
{
void* const p = std::malloc (n);
std::fprintf (stdout, "operator new (%zu) ==> %#p\n", n, p);
return p;
}
void operator delete (void *p) throw ()
{
std::fprintf (stdout, "operator delete (%#p)\n", p);
std::free (p);
}
void* operator new[] (std::size_t n) throw (std::bad_alloc)
{
void* const p = std::malloc (n);
std::fprintf (stdout, "operator new[] (%zu) ==> %#p\n", n, p);
return p;
}
void operator delete[] (void *p) throw ()
{
std::fprintf (stdout, "operator delete[] (%#p)\n", p);
std::free (p);
}
operator new (58) ==> 0x502010
operator delete (0x501fe8)
*** glibc detected *** free(): invalid pointer: 0x0000000000501fe8 ***
Aborted
#include <string>
int main ()
{
std::string s = "a";
}
The only library symbols referenced from the executable are
__rw::__rw_throw(int, ...)
__rw::__rw_deallocate(void*, unsigned long, int)
std::string::_C_null_ref
std::string::string(char const*, std::allocator<char> const&)
Of these, the first one isn't being called and the second and
fourth haven't changed (according to diff of string.cc). I hate
to admit I'm stumped. I suppose I should try to do a build on
a different distribution of Linux with an older version of gcc
to see if I can reproduce it there.
*** glibc detected *** ./t: free(): invalid pointer: 0x0000000000500fe8 ***
======= Backtrace: =========
/lib64/libc.so.6[0x2b71c3a4537e]
/lib64/libc.so.6(__libc_free+0x6c)[0x2b71c3a4699c]
./t(__gxx_personality_v0+0x198)[0x400968]
/lib64/libc.so.6(__libc_start_main+0xf4)[0x2b71c39f7154]
./t(__gxx_personality_v0+0x59)[0x400829]
