Seeing a lot of output like this in WebKit1 test logs: 07:54:18.507 4914 worker/5 worker/5 webgl/1.0.3/conformance/glsl/implicit/divide_ivec4_vec4.vert.html output stderr lines: 07:54:18.508 4914 worker/5 TestRunner::notifyDone() called unexpectedly. 07:54:18.594 4914 worker/13 worker/13 webgl/1.0.3/conformance/glsl/misc/non-ascii.vert.html output stderr lines: 07:54:18.594 4914 worker/13 TestRunner::notifyDone() called unexpectedly.
Saw it here, didn't search elsewhere: https://ews-build.webkit.org/#/builders/56/builds/16099
<rdar://problem/83840411>