[llvm-bugs] [Bug 39203] New: include/c++/v1/__debug:259 : ubsan reports an error with _LIBCPP_DEBUG=1.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39203

            Bug ID: 39203
           Summary: include/c++/v1/__debug:259 : ubsan reports an error
                    with _LIBCPP_DEBUG=1.
           Product: libc++
           Version: 7.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pawel_sikora at zoho.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

#include <vector>

int main()
{
    std::vector< int > v;
    return 0;
}

$ clang++ -Wall -g2 -fsanitize=undefined -D_LIBCPP_DEBUG=1 -stdlib=libc++ t.cpp
-o t
$ ./t

(...)/include/c++/v1/__debug:259:40: runtime error: member access within
address 0x0000028a02b0 which does not point to an object of type
'std::__1::__c_node'
0x0000028a02b0: note: object has invalid vptr
 00 00 00 00  00 00 00 00 00 00 00 00  08 27 31 f7 fc 7f 00 00  00 00 00 00 00
00 00 00  00 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              invalid vptr
(...)/include/c++/v1/__debug:259:51: runtime error: member access within
address 0x0000028a02b0 which does not point to an object of type
'std::__1::__c_node'
0x0000028a02b0: note: object has invalid vptr
 00 00 00 00  00 00 00 00 00 00 00 00  08 27 31 f7 fc 7f 00 00  00 00 00 00 00
00 00 00  00 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              invalid vptr

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