swift : thread sanitizer output

From :

$ git branch -vv
...
* master                  c541791 [origin/master] Merge branch 'gizmo_volume_io' into 'master'

$ module list

Currently Loaded Modules:
  1) gcc-6.2.0-gcc-4.8-fw44bda   2) openmpi-2.0.0-gcc-6.2.0-rmv3caz   3) hdf5-1.10.0-patch1-gcc-6.2.0-dbjkmep   4) metis-5.1.0-gcc-6.2.0-kbowe7l

Configure line :

$ ../sources/configure CC=mpicc CPPFLAGS="-I${METIS_ROOT}/include" --prefix=$PWD/../install --disable-optimization --enable-debug=yes --enable-parallel-hdf5 --enable-mpi --with-metis=${METIS_ROOT} --enable-compiler-warnings CFLAGS="-fsanitize=thread" LDFLAGS="-fsanitize=thread"

When I run the example UniformBox_3D :

$ ../../install/bin/swift -s -C -t 1 uniformBox.yml

I get a lot of Warning on data races, like :

==================
WARNING: ThreadSanitizer: data race (pid=29715)
  Atomic write of size 4 at 0x7d800000f320 by thread T1:
    #0 __tsan_atomic32_compare_exchange_weak /home/mculpo/PycharmProjects/spack/var/spack/stage/gcc-6.2.0-fw44bdamcou7rerucarajomex4zjg4s6/gcc-6.2.0/libsanitizer/tsan/tsan_interface_atomic.cc:809 (libtsan.so.0+0x00000005fc63)
    #1 queue_insert ../../sources/src/queue.c:105 (swift+0x000000491329)
    #2 scheduler_enqueue ../../sources/src/scheduler.c:1183 (swift+0x0000004818c1)
    #3 scheduler_enqueue_mapper ../../sources/src/scheduler.c:1018 (swift+0x000000480fcd)
    #4 threadpool_runner ../../sources/src/threadpool.c:68 (swift+0x0000004905bc)

  Previous read of size 4 at 0x7d800000f320 by thread T2:
    #0 queue_get_incoming ../../sources/src/queue.c:56 (swift+0x000000490de2)
    #1 queue_gettask ../../sources/src/queue.c:180 (swift+0x0000004916d6)
    #2 scheduler_gettask ../../sources/src/scheduler.c:1299 (swift+0x000000481db9)
    #3 runner_main ../../sources/src/runner.c:1222 (swift+0x00000046bd41)

  Location is heap block of size 4096 at 0x7d800000f000 allocated by main thread:
    #0 malloc /home/mculpo/PycharmProjects/spack/var/spack/stage/gcc-6.2.0-fw44bdamcou7rerucarajomex4zjg4s6/gcc-6.2.0/libsanitizer/tsan/tsan_interceptors.cc:538 (libtsan.so.0+0x0000000268bc)
    #1 queue_init ../../sources/src/queue.c:148 (swift+0x00000049149d)
    #2 scheduler_init ../../sources/src/scheduler.c:1375 (swift+0x0000004822ca)
    #3 engine_init ../../sources/src/engine.c:3495 (swift+0x00000047984d)
    #4 main ../../sources/examples/main.c:458 (swift+0x000000404bd9)

  Thread T1 (tid=29717, running) created by main thread at:
    #0 pthread_create /home/mculpo/PycharmProjects/spack/var/spack/stage/gcc-6.2.0-fw44bdamcou7rerucarajomex4zjg4s6/gcc-6.2.0/libsanitizer/tsan/tsan_interceptors.cc:876 (libtsan.so.0+0x000000027d6d)
    #1 threadpool_init ../../sources/src/threadpool.c:109 (swift+0x0000004908e1)
    #2 engine_init ../../sources/src/engine.c:3480 (swift+0x0000004795f3)
    #3 main ../../sources/examples/main.c:458 (swift+0x000000404bd9)

  Thread T2 (tid=29718, running) created by main thread at:
    #0 pthread_create /home/mculpo/PycharmProjects/spack/var/spack/stage/gcc-6.2.0-fw44bdamcou7rerucarajomex4zjg4s6/gcc-6.2.0/libsanitizer/tsan/tsan_interceptors.cc:876 (libtsan.so.0+0x000000027d6d)
    #1 engine_init ../../sources/src/engine.c:3506 (swift+0x000000479a46)
    #2 main ../../sources/examples/main.c:458 (swift+0x000000404bd9)

SUMMARY: ThreadSanitizer: data race ../../sources/src/queue.c:105 in queue_insert
==================

For the most part they seems read on write problems (likely due to the fact that reads are not atomic).