The result is a list of CLs that change the crashed files. 

Author: caryclark
Project: chromium-pdfium
Changelist: https://pdfium.googlesource.com/pdfium.git/+/8f875507a986d10335e40a5f7c1679aff9770d0a
Time: Tue Dec 06 13:49:34 2016 -0800
Files cfx_renderdevice.cpp, cpdf_renderstatus.cpp are changed in this cl (and is part of stack frame #5, "CFX_RenderDevice::DrawPathWithBlend")
Minimum distance from crash line to modified line: 29. (file: cfx_renderdevice.cpp, crashed on: 593, modified: 622).

I have no knowledge of the code (antigrain) in question.

In time, code I do understand (Skia) eliminates the need for this code, and will resolve this. Until then, if someone else wants to fix the bug in antigrain they should feel free to do so.

ClusterFuzz has detected this issue as fixed in range 440242:440280.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6740501853372416

Fuzzer: ochang_search_index_mutator
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Float-cast-overflow
Crash Address: 
Crash State:
  poly_coord
  agg::rasterizer_scanline_aa::add_vertex
  void agg::rasterizer_scanline_aa::add_path_transformed<agg::conv_stroke<agg::pat
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=435261:438085
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=440242:440280

Minimized Testcase (912.94 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96be-6G0oOPa43GnXZM6EqTkGg3hTP0wq-edJVsRnCFwUgAcrAJ9JoOxFcSEUSPnhsIo67uWOQc_2ZnHKLyXvo-fi_pZMI-ZYFl5qgwl5N452Q7CB5QQzgJ1AYYclEEjoshd5K_qzJbYiw1FR8cKBkhpvGnmd9hjMpV3PVbNNKkj2ynQ0g?testcase_id=6740501853372416

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 6740501853372416 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.