Assigning to the concern owner from find it results --
The result is a list of CLs that change the crashed files. 

Author: lukasza
Project: chromium
Changelist: https://chromium.googlesource.com/chromium/src/+/9d858647530db2c22e1267e443034d23f2e602d9
Time: Thu Dec 08 21:52:12 2016
Files LayoutBlock.cpp, LayoutBox.cpp are changed in this cl (and is part of stack frame #6, "blink::LayoutBlock::addOverflowFromBlockChildren")
Minimum distance from crash line to modified line: 35. (file: LayoutBox.cpp, crashed on: 4868, modified: 4903).

@lukasza -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

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

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5136348077096960

Fuzzer: inferno_twister
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Float-cast-overflow
Crash Address: 
Crash State:
  blink::TransformationMatrix::internalMapPoint
  blink::TransformationMatrix::mapRect
  blink::TransformationMatrix::mapRect
  
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 (0.41 Kb): https://cluster-fuzz.appspot.com/download/AMIfv97-Pk33OCPBYXBmymOHLDQ2eiMpP-x5tS9m9E-lEcARv22bo-V0M_MnoFVYaC5Ozqv2L2opqyDB5rDuwACrY_TARrVBH5B4fboHbc6NiRuIUjZKJP-sHlB-y2HM1ttvn9dJv_29BXFAK_4gV_kTh6Pm9I4RSw?testcase_id=5136348077096960

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 5136348077096960 is verified as fixed, so closing issue.

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