ThreadSanitizer warnings related to border extension

SUMMARY: ThreadSanitizer: data race vp9/common/vp9_reconinter.c:52 
build_mc_border

Full log attached.

v1.3.0-633-g4f2a80f

CC=clang \
CXX=clang++ \
LD=clang \
LDFLAGS='-fsanitize=thread' \
./configure \
--extra-cflags='-fsanitize=thread -fsanitize-blacklist=tsan-supp.txt' \
--enable-debug --enable-pic --disable-vp8

The clip I was testing was 4K, but this looks like a more general issue:
$ ./vpxdec --summary --noblit -t 8 ...

Reverting ff2c96b and its dependent commits gets rid of the warning.
ff2c96b Implenment on demand border extension. In place extend the border now. 
Next commit will totally remove the border.

This looks to be the same location that was updated to use memmove in:
1339f38 Fix valgrind error.

Original issue reported on code.google.com by jz...@google.com on 14 Jan 2014 at 4:30

Merged into: #692

Attachments:

konsole.txt.gz
tsan-supp.txt

ericmckean / webm

ThreadSanitizer warnings related to border extension #693