Bug 1111987

Full changelog since the current version present in Fedora:

Intel TBB 4.2 Update 5
TBB_INTERFACE_VERSION == 7005

Changes (w.r.t. Intel TBB 4.2 Update 4):

- The second template argument of class aligned_space<T,N> now is set
    to 1 by default.

Preview Features:

- Better support for exception safety, task priorities and floating
    point settings in class task_arena.
- task_arena::current_slot() has been renamed to
    task_arena::current_thread_index().

Bugs fixed:

- Task priority change possibly ignored by a worker thread entering
    a nested parallel construct.
- Memory leaks inside the task scheduler when running on
    Intel(R) Xeon Phi(tm) coprocessor.

Open-source contributions integrated:

- Improved detection of X Window support for Intel TBB examples
    and other feedback by Raf Schietekat.

------------------------------------------------------------------------
Intel TBB 4.2 Update 4
TBB_INTERFACE_VERSION == 7004

Changes (w.r.t. Intel TBB 4.2 Update 3):

- Added possibility to specify floating-point settings at invocation
    of most parallel algorithms (including flow::graph) via
    task_group_context.
- Added dynamic replacement of malloc_usable_size() under
    Linux*/Android* and dlmalloc_usable_size() under Android*.
- Added new methods to concurrent_vector:
    grow_by() that appends a sequence between two given iterators;
    grow_to_at_least() that initializes new elements with a given value.
- Improved affinity_partitioner for better performance on balanced
    workloads.
- Improvements in the task scheduler, including better scalability
    when threads search for a task arena, and better diagnostics.
- Improved allocation performance for workloads that do intensive
    allocation/releasing of same-size objects larger than ~8KB from
    multiple threads.
- Exception support is enabled by default for 32-bit MinGW compilers.
- The tachyon example for Android* can be built for all targets
    supported by the installed NDK.
- Added Windows Store* version of the tachyon example.
- GettingStarted/sub_string_finder example ported to offload execution
    on Windows* for Intel(R) Many Integrated Core Architecture.

Preview Features:

- Removed task_scheduler_observer::on_scheduler_leaving() callback.
- Added task_scheduler_observer::may_sleep() callback.
- The CPF or_node has been renamed indexer_node. The input to
    indexer_node is now a list of types. The output of indexer_node is
    a tagged_msg type composed of a tag and a value. For indexer_node,
    the tag is a size_t.

Bugs fixed:

- Fixed data races in preview extensions of task_scheduler_observer.
- Added noexcept(false) for destructor of task_group_base to avoid
    crash on cancelation of structured task group in C++11.

Open-source contributions integrated:

- Improved concurrency detection for BG/Q, and other improvements
    by Raf Schietekat.
- Fix for crashes in enumerable_thread_specific in case if a contained
    object is too big to be constructed on the stack by Adrien Guinet.

------------------------------------------------------------------------
Intel TBB 4.2 Update 3
TBB_INTERFACE_VERSION == 7003

Changes (w.r.t. Intel TBB 4.2 Update 2):

- Added support for Microsoft* Visual Studio* 2013.
- Improved Microsoft* PPL-compatible form of parallel_for for better 
    support of auto-vectorization.
- Added a new example for cancellation and reset in the flow graph:
    Kohonen self-organizing map (examples/graph/som).
- Various improvements in source code, tests, and makefiles.

Bugs fixed:

- Added dynamic replacement of _aligned_msize() previously missed.
- Fixed task_group::run_and_wait() to throw invalid_multiple_scheduling
    exception if the specified task handle is already scheduled.

Open-source contributions integrated:

- A fix for ARM* processors by Steve Capper.
- Improvements in std::swap calls by Robert Maynard.

------------------------------------------------------------------------
Intel TBB 4.2 Update 2
TBB_INTERFACE_VERSION == 7002

Changes (w.r.t. Intel TBB 4.2 Update 1):

- Enable C++11 features for Microsoft* Visual Studio* 2013 Preview.
- Added a test for compatibility of TBB containers with C++11
    range-based for loop.

Changes affecting backward compatibility:

- Internal layout changed for class tbb::flow::limiter_node.

Preview Features:

- Added speculative_spin_rw_mutex, a read-write lock class which uses
    Intel(R) Transactional Synchronization Extensions.

Bugs fixed:

- When building for Intel(R) Xeon Phi(tm) coprocessor, TBB programs
    no longer require explicit linking with librt and libpthread.

Open-source contributions integrated:

- Fixes for ARM* processors by Steve Capper, Leif Lindholm
    and Steven Noonan.
- Support for Clang on Linux by Raf Schietekat.
- Typo correction in scheduler.cpp by Julien Schueller.

------------------------------------------------------------------------
Intel TBB 4.2 Update 1
TBB_INTERFACE_VERSION == 7001

Changes (w.r.t. Intel TBB 4.2):

- Added project files for Microsoft* Visual Studio* 2010.
- Initial support of Microsoft* Visual Studio* 2013 Preview.
- Enable C++11 features available in Intel(R) C++ Compiler 14.0.
- scalable_allocation_mode(TBBMALLOC_SET_SOFT_HEAP_LIMIT, <size>) can be
    used to urge releasing memory from tbbmalloc internal buffers when
    the given limit is exceeded.

Preview Features:

- Class task_arena no longer requires linking with a preview library,
    though still remains a community preview feature.
- The method task_arena::wait_until_empty() is removed.
- The method task_arena::current_slot() now returns -1 if 
    the task scheduler is not initialized in the thread.

Changes affecting backward compatibility:

- Because of changes in internal layout of graph nodes, the namespace
    interface number of flow::graph has been incremented from 6 to 7.

Bugs fixed:

- Fixed a race in lazy initialization of task_arena.
- Fixed flow::graph::reset() to prevent situations where tasks would be
    spawned in the process of resetting the graph to its initial state.
- Fixed decrement bug in limiter_node.
- Fixed a race in arc deletion in the flow graph.

Open-source contributions integrated:

- Improved support for IBM* Blue Gene* by Raf Schietekat.

------------------------------------------------------------------------
Intel TBB 4.2
TBB_INTERFACE_VERSION == 7000

Changes (w.r.t. Intel TBB 4.1 Update 4):

- Added speculative_spin_mutex, which uses Intel(R) Transactional
    Synchronization Extensions when they are supported by hardware.
- Binary files linked with libc++ (the C++ standard library in Clang)
    were added on OS X*.
- For OS X* exact exception propagation is supported with Clang;
    it requires use of libc++ and corresponding Intel TBB binaries.
- Support for C++11 initilizer lists in constructor and assigment
    has been added to concurrent_hash_map, concurrent_unordered_set,
    concurrent_unordered_multiset, concurrent_unordered_map,
    concurrent_unordered_multimap.
- The memory allocator may now clean its per-thread memory caches
    when it cannot get more memory.
- Added the scalable_allocation_command() function for on-demand
    cleaning of internal memory caches.
- Reduced the time overhead for freeing memory objects smaller than ~8K.
- Simplified linking with the debug library for applications that use
    Intel TBB in code offloaded to Intel(R) Xeon Phi(tm) coprocessors.
    See an example in
    examples/GettingStarted/sub_string_finder/Makefile.
- Various improvements in source code, scripts and makefiles.

Changes affecting backward compatibility:

- tbb::flow::graph has been modified to spawn its tasks;
    the old behaviour (task enqueuing) is deprecated. This change may
    impact applications that expected a flow graph to make progress
    without calling wait_for_all(), which is no longer guaranteed. See
    the documentation for more details.
- Changed the return values of the scalable_allocation_mode() function.

Bugs fixed:

- Fixed a leak of parallel_reduce body objects when execution is
    cancelled or an exception is thrown, as suggested by Darcy Harrison.
- Fixed a race in the task scheduler which can lower the effective
    priority despite the existence of higher priority tasks.
- On Linux an error during destruction of the internal thread local
    storage no longer results in an exception.

Open-source contributions integrated:

- Fixed task_group_context state propagation to unrelated context trees
    by Raf Schietekat.

------------------------------------------------------------------------

I'll be updating to 4.3u2 next week.
  https://lists.fedoraproject.org/pipermail/devel/2015-January/206743.html

tbb-4.3-1.20141204.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/tbb-4.3-1.20141204.fc21

Package tbb-4.3-1.20141204.fc21:
* should fix your issue,
* was pushed to the Fedora 21 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing tbb-4.3-1.20141204.fc21'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2015-1218/tbb-4.3-1.20141204.fc21
then log in and leave karma (feedback).

tbb-4.3-1.20141204.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.