[LLVMbugs] [Bug 20826] New: compiled code crash in std::string destructor in lambda capture on PPC 32

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Sep 1 10:14:37 PDT 2014


            Bug ID: 20826
           Summary: compiled code crash in std::string destructor in
                    lambda capture on PPC 32
           Product: clang
           Version: trunk
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bayoubengal at mac.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I'm cross-compiling. host == OSX 10.9. target == -target powerpc-unknown-linux
-m32 -mcpu=e500v2 -std=c++14. clang code version == 'clang version 3.6.0 (trunk
216704)' std lib flag == '-stdlib=libc++'.  optimization flags == '-g -O0'

The code crashes in the basic_string destructor with the system complaining of
a double free of a pointer. I do indeed see this pointer being passed to free()
multiple times. However, I have no discerned if the pointer is being
reallocated each time.

message from system == '*** glibc detected *** /test/testPocosn_static: double
free or corruption (fasttop): 0x100940e0 ***
======= Backtrace: ========='

partial backtrace of the crash...

#4  0x1000673c in deallocate (this=0x8214924e, __p=0x4 <error: Cannot access
memory at address 0x4>)
#5  deallocate (__a=..., __p=0x0, __n=0) at
#6  std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::~basic_string (this=0x0)
#7  0x8256c9a2 in ?? ()

code snippet:

(This code runs fine when targeting OSX 10.9/x86_64)

#include <string>
#include <memory>
#include <iostream>
#include <future>

int main(int argc, char** argv)

   std::string tmpCaptureTest="test a captured string";

   auto tmpCallback = [=](const std::string& s, int i , double d)

      std::cout << tmpCaptureTest << s << i << d << std::endl;

      return 43;

   std::packaged_task<int (const std::string& s, int i , double d)>

   std::future<int> tmpTaskResult = tmpTask.get_future();

   auto tmpArg1 = "test";
   auto tmpArg2 = 56;
   auto tmpArg3 = 3.7;
   auto tmpDispatchCallbackWrapper = [=, tmpTask2 = std::move(tmpTask)] ()

      tmpTask2(tmpArg1, tmpArg2, tmpArg3);


   return 0;

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