I get nondeterministic crashes in the following small set of tests on Linux:
./webkit/tools/layout_tests/run_webkit_tests.sh --no-pixel-tests
LayoutTests/fast/canvas/

Some notes:
 - doesn't occur in debug mode, only opt, but only some of the time
 - efence doesn't seem to work with test_shell in general (not sure why)
 - valgrind doesn't see a problem (maybe it's due to racing?)  (maybe
I'm running valgrind wrong?)
 - seems to be more reproducible if you run via Xvfb (see
http://code.google.com/p/chromium/wiki/LayoutTestsLinux), which maybe
also points to racing
 - turning off randomize_va_space (aka ASLR) doesn't appear to make
the failures any more consistent
 - seems to generally affect the same test if you run them in order,
but I added a "--randomize-order" flag to the layout test runner and
that causes different tests to fail

I'm running out of ideas here...

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