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Description
tsan complains, and I am not sure if it shows a real problem or not.
I prefer to ask for advice before diving in there :)
upipe configured with gcc 6.2.0 (ubuntu 16.10)
./configure --enable-static --disable-shared CFLAGS="-fPIE -fsanitize=thread -O2 -g -fno-omit-frame-pointer" CXXFLAGS="-fPIE -fsanitize=thread -O2 -g -fno-omit-frame-pointer" LDFLAGS="-fsanitize=thread -pie"
Running on 3.19.0-39-generic from Ubuntu 15.04, because 3.19.0-40 and later have Linux commit d1fd836dcf00d2028c700c7e44d2c23404062c90
Supporting these kernels need a recent llvm patch so I just used an older kernel.
You might need to disable ASLR as well:
echo 0 | sudo tee /proc/sys/kernel/randomize_va_space
Although it seems to work for 3.19.0-39 even with ASLR enabled
==================
WARNING: ThreadSanitizer: data race (pid=18188)
Read of size 2 at 0x7d840001ccd2 by thread T1:
#0 uring_fifo_find ../../include/upipe/uring.h:333 (uplay+0x000000c94b8c)
#1 uring_fifo_pop ../../include/upipe/uring.h:371 (uplay+0x000000c94b8c)
#2 ufifo_pop_internal ../../include/upipe/ufifo.h:97 (uplay+0x000000c94b8c)
#3 uqueue_pop_internal ../../include/upipe/uqueue.h:162 (uplay+0x000000c94b8c)
#4 upipe_xfer_mgr_worker /home/fun/upipe/lib/upipe-modules/upipe_transfer.c:538 (uplay+0x000000c94b8c)
#5 upump_common_dispatch /home/fun/upipe/lib/upipe/upump_common.c:146 (uplay+0x000000caaffe)
#6 upump_ev_dispatch_io /home/fun/upipe/lib/upump-ev/upump_ev.c:90 (uplay+0x00000010a77d)
#7 ev_invoke_pending <null> (libev.so.4+0x000000003d72)
#8 upipe_pthread_start /home/fun/upipe/lib/upipe-pthread/upipe_pthread_transfer.c:109 (uplay+0x000000186609)
#9 <null> <null> (libtsan.so.0+0x0000000245a9)
Previous write of size 2 at 0x7d840001ccd2 by main thread:
#0 uring_fifo_push ../../include/upipe/uring.h:411 (uplay+0x000000c97dc6)
#1 ufifo_push ../../include/upipe/ufifo.h:85 (uplay+0x000000c97dc6)
#2 uqueue_push ../../include/upipe/uqueue.h:138 (uplay+0x000000c97dc6)
#3 upipe_xfer_mgr_send /home/fun/upipe/lib/upipe-modules/upipe_transfer.c:589 (uplay+0x000000c97dc6)
#4 upipe_xfer_control /home/fun/upipe/lib/upipe-modules/upipe_transfer.c:447 (uplay+0x000000c9879a)
#5 upipe_control_nodbg_va ../../include/upipe/upipe.h:1033 (uplay+0x00000015e788)
#6 upipe_control_va ../../include/upipe/upipe.h:1051 (uplay+0x00000015e788)
#7 upipe_control ../../include/upipe/upipe.h:1109 (uplay+0x00000015e788)
#8 upipe_set_output ../../include/upipe/upipe.h:1150 (uplay+0x0000001609b0)
#9 _upipe_wsrc_alloc /home/fun/upipe/lib/upipe-modules/upipe_worker_source.c:231 (uplay+0x0000001609b0)
#10 upipe_alloc_va ../include/upipe/upipe.h:382 (uplay+0x0000000e31ab)
#11 upipe_alloc ../include/upipe/upipe.h:404 (uplay+0x0000000e31ab)
#12 upipe_wsrc_alloc ../include/upipe-modules/upipe_worker_source.h:121 (uplay+0x0000000e6874)
#13 uplay_start /home/fun/upipe/examples/uplay.c:567 (uplay+0x0000000e6874)
#14 upump_common_dispatch /home/fun/upipe/lib/upipe/upump_common.c:146 (uplay+0x000000caaffe)
#15 upump_ev_dispatch_idle /home/fun/upipe/lib/upump-ev/upump_ev.c:119 (uplay+0x00000010a7dd)
#16 ev_invoke_pending <null> (libev.so.4+0x000000003d72)
#17 __libc_start_main <null> (libc.so.6+0x0000000203f0)
Location is heap block of size 4592 at 0x7d840001cc00 allocated by main thread:
#0 malloc <null> (libtsan.so.0+0x000000026c3c)
#1 upipe_xfer_mgr_alloc /home/fun/upipe/lib/upipe-modules/upipe_transfer.c:678 (uplay+0x000000c98dfb)
#2 upipe_pthread_xfer_mgr_alloc /home/fun/upipe/lib/upipe-pthread/upipe_pthread_transfer.c:175 (uplay+0x000000186b4d)
#3 main /home/fun/upipe/examples/uplay.c:766 (uplay+0x0000000e24ba)
Thread T1 (tid=18190, running) created by main thread at:
#0 pthread_create <null> (libtsan.so.0+0x0000000284f0)
#1 upipe_pthread_xfer_mgr_alloc /home/fun/upipe/lib/upipe-pthread/upipe_pthread_transfer.c:186 (uplay+0x000000186c06)
#2 main /home/fun/upipe/examples/uplay.c:766 (uplay+0x0000000e24ba)
SUMMARY: ThreadSanitizer: data race ../../include/upipe/uring.h:333 in uring_fifo_find
==================
And many other warnings
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