https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60078
--- Comment #14 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Well,
that happened only once. and the problem did never ever repeat.
But my gut feeling is still that there is a race conditition.
However I have been recently working on TSAN a bit, and I have an
experimental tsan version that I played with. Initially
it ICE'd on Ada's VIEW_CONVERT_EXPRs, but when I fixed that I got:
gnatmake -g -fsanitize=thread c761007
./c761007
,.,. C761007 ACATS 2.5 15-01-01 15:29:05
---- C761007 Check that if a finalize procedure invoked by a transfer of
control or selection of a terminate alternative attempts
to propagate an exception, the exception is ignored, but
any other finalizations due to be performed are
performed.
==================
WARNING: ThreadSanitizer: data race (pid=27044)
Read of size 4 at 0x000000657764 by thread T5:
#0 c761007_1__finalize /home/ed/gnu/gcc-test/c761007_1.adb:10
(c761007+0x00000040c749)
#1 c761007_1__containerDF <null> (c761007+0x00000040bc3b)
#2 c761007_2__prot_w_fin_objVDF <null> (c761007+0x000000404364)
#3 c761007__subtest_3__check_atc_operation___finalizer.5515 <null>
(c761007+0x00000040efd2)
#4 c761007__subtest_3__check_atc_operation.5508 <null>
(c761007+0x00000040f1ec)
#5 c761007__subtest_3__subtest_3_taskTKB.5506 <null>
(c761007+0x00000040f5de)
#6 system__tasking__stages__task_wrapper
/home/ed/gnu/gcc-build/gcc/ada/rts/s-tassta.adb:1262 (c761007+0x000000418800)
Previous write of size 4 at 0x000000657764 by thread T6:
#0 c761007_1__finalize /home/ed/gnu/gcc-test/c761007_1.adb:17
(c761007+0x00000040c859)
#1 c761007_1__containerDF <null> (c761007+0x00000040bc3b)
#2 c761007_2__prot_w_fin_objVDF <null> (c761007+0x000000404364)
#3 c761007__subtest_3__subtest_3_taskTK__nestingTK___finalizer.5573 <null>
(c761007+0x00000040f854)
#4 c761007__subtest_3__subtest_3_taskTK__nestingTKB.5565 <null>
(c761007+0x00000040fa2a)
#5 system__tasking__stages__task_wrapper
/home/ed/gnu/gcc-build/gcc/ada/rts/s-tassta.adb:1262 (c761007+0x000000418800)
Location is global 'c761007_1__side_effect_finger' of size 4 at
0x000000657764 (c761007+0x000000657764)
Thread T5 'subtest_3_task' (tid=27050, running) created by main thread at:
#0 pthread_create
../../../../gcc-trunk/libsanitizer/tsan/tsan_interceptors.cc:895
(libtsan.so.0+0x0000000272f4)
#1 system__task_primitives__operations__create_task
/home/ed/gnu/gcc-build/gcc/ada/rts/s-taprop.adb:1016 (c761007+0x000000411d72)
#2 _ada_c761007 /home/ed/gnu/gcc-test/c761007.adb:228
(c761007+0x00000040d551)
#3 main /home/ed/gnu/gcc-test/b~c761007.adb:331 (c761007+0x0000004042e4)
Thread T6 'nesting' (tid=27051, running) created by thread T5 at:
#0 pthread_create
../../../../gcc-trunk/libsanitizer/tsan/tsan_interceptors.cc:895
(libtsan.so.0+0x0000000272f4)
#1 system__task_primitives__operations__create_task
/home/ed/gnu/gcc-build/gcc/ada/rts/s-taprop.adb:1016 (c761007+0x000000411d72)
#2 system__tasking__stages__task_wrapper
/home/ed/gnu/gcc-build/gcc/ada/rts/s-tassta.adb:1262 (c761007+0x000000418800)
SUMMARY: ThreadSanitizer: data race /home/ed/gnu/gcc-test/c761007_1.adb:10
c761007_1__finalize
==================
==================
WARNING: ThreadSanitizer: data race (pid=27044)
Read of size 1 at 0x00000065a343 by thread T5:
#0 c761007_1__finalize /home/ed/gnu/gcc-test/c761007_1.adb:12
(c761007+0x00000040c7d4)
#1 c761007_1__containerDF <null> (c761007+0x00000040bc3b)
#2 c761007_2__prot_w_fin_objVDF <null> (c761007+0x000000404364)
#3 c761007__subtest_3__check_atc_operation___finalizer.5515 <null>
(c761007+0x00000040efd2)
#4 c761007__subtest_3__check_atc_operation.5508 <null>
(c761007+0x00000040f1ec)
#5 c761007__subtest_3__subtest_3_taskTKB.5506 <null>
(c761007+0x00000040f5de)
#6 system__tasking__stages__task_wrapper
/home/ed/gnu/gcc-build/gcc/ada/rts/s-tassta.adb:1262 (c761007+0x000000418800)
Previous write of size 1 at 0x00000065a343 by thread T6:
#0 c761007_1__finalize /home/ed/gnu/gcc-test/c761007_1.adb:18
(c761007+0x00000040c902)
#1 c761007_1__containerDF <null> (c761007+0x00000040bc3b)
#2 c761007_2__prot_w_fin_objVDF <null> (c761007+0x000000404364)
#3 c761007__subtest_3__subtest_3_taskTK__nestingTK___finalizer.5573 <null>
(c761007+0x00000040f854)
#4 c761007__subtest_3__subtest_3_taskTK__nestingTKB.5565 <null>
(c761007+0x00000040fa2a)
#5 system__tasking__stages__task_wrapper
/home/ed/gnu/gcc-build/gcc/ada/rts/s-tassta.adb:1262 (c761007+0x000000418800)
Location is global 'c761007_1__side_effect' of size 80 at 0x00000065a340
(c761007+0x00000065a343)
Thread T5 'subtest_3_task' (tid=27050, running) created by main thread at:
#0 pthread_create
../../../../gcc-trunk/libsanitizer/tsan/tsan_interceptors.cc:895
(libtsan.so.0+0x0000000272f4)
#1 system__task_primitives__operations__create_task
/home/ed/gnu/gcc-build/gcc/ada/rts/s-taprop.adb:1016 (c761007+0x000000411d72)
#2 _ada_c761007 /home/ed/gnu/gcc-test/c761007.adb:228
(c761007+0x00000040d551)
#3 main /home/ed/gnu/gcc-test/b~c761007.adb:331 (c761007+0x0000004042e4)
Thread T6 'nesting' (tid=27051, running) created by thread T5 at:
#0 pthread_create
../../../../gcc-trunk/libsanitizer/tsan/tsan_interceptors.cc:895
(libtsan.so.0+0x0000000272f4)
#1 system__task_primitives__operations__create_task
/home/ed/gnu/gcc-build/gcc/ada/rts/s-taprop.adb:1016 (c761007+0x000000411d72)
#2 system__tasking__stages__task_wrapper
/home/ed/gnu/gcc-build/gcc/ada/rts/s-tassta.adb:1262 (c761007+0x000000418800)
SUMMARY: ThreadSanitizer: data race /home/ed/gnu/gcc-test/c761007_1.adb:12
c761007_1__finalize
==================
==== C761007 PASSED ============================.
ThreadSanitizer: reported 2 warnings
