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Created attachment 1197277 [details]
thread.cxx

In the attached test case, if flush is called, it
will fail with the message:

terminate called after throwing an instance of 'std::runtime_error'

  The test case fails because of 'endl'.

  Other kinds of cancellation points work as expected.

Wrong component.

Simpler testcase, without STL, needs just libsupc++ and libpthread:

#include <pthread.h>
#include <unistd.h>

namespace __cxxabiv1
{  
  class __forced_unwind
  {
    virtual ~__forced_unwind() throw();
    virtual void __pure_dummy() = 0; 
  };
}

int a;

extern "C" void *
fun (void *)
{
  try
  {
    throw 1;
  }
  catch (int &)
  {
    try
    {
      char buf[10];
      for (;;)
	read (4, buf, 0);
    }
    catch (__cxxabiv1::__forced_unwind &)
    {
      a = 5;
      throw;
    }
  }

  return NULL;
}

int
main ()
{
  pthread_t thread;
  pthread_create (&thread, NULL, fun, NULL);
  pthread_cancel (thread);
  pthread_join (thread, NULL);
}

All GCC versions affected.

Hello 

Can we get a update on likelyhood of this getting fixed in RHEL-6?

This BZ depends on the upstream bug being fixed.  There hasn't been any progress, so I'm closing this BZ in favor of the upstream bug.