For example, see https://build.webkit.org/results/Apple%20Win%207%20Release%20(Tests)/r185259%20(52263)/results.html. The relevant failures are: Tests that crashed: +inspector-protocol/debugger/didSampleProbe-multiple-probes.html +inspector-protocol/debugger/hit-breakpoint-from-console.html +inspector-protocol/debugger/setBreakpoint-condition.html Tests that failed text/pixel/audio diff: inspector-protocol/debugger/breakpoint-inside-conditons-and-actions.html inspector-protocol/debugger/setBreakpoint-actions.html inspector-protocol/debugger/setBreakpoint-column.html inspector-protocol/debugger/setBreakpointByUrl-sourceURL.html These failures only seem to manifest on the Windows Release build test bots. They don't manifest on the Debug build test bots nor Mac bots.
I skipped these tests for now in r185283: <http://trac.webkit.org/r185283>. It turns out, that the inspector-protocol/debugger tests were already skipped for platform/mac and inspector-protocol is skipped entirely for Debug build on platform/win. That may be why we don't see the failures on those bots.
Found the culprit: an un-initialized variable. This makes me re-consider introducing an opaque type for encapsulating an Exception*. But for now, I'll do the minimum fix.
Created attachment 254407 [details] the patch.
Comment on attachment 254407 [details] the patch. Clearing flags on attachment: 254407 Committed r185286: <http://trac.webkit.org/changeset/185286>
All reviewed patches have been landed. Closing bug.