Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.

Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/f316d5f1b672a7bb0d726610392633ae0565b129 (Roll clang 324578:325667.).

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label. If you aren't the correct owner for this issue, please unassign yourself as soon as possible so it can be re-triaged.

behdad@, can you please triage this regression, unsure if this is even related to clang roll, seems unlikely.

Unlikely to be a regression.  Has been flaky.  I fixed one instance before:

https://bugs.chromium.org/p/chromium/issues/detail?id=734820

Another two were marked verified:

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5584
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3717

I'll take a look, but is not serious, and unlikely to be related to clang roll.

Looking at the test case, it looks like a real overflow.  The test consists of over 500 stacking combining marks with a huge font size.  Not sure we want to do anything about it.

Dominik, does Blink's Skia-HarfBuzz layer work in 16.16 fixed?  Maybe we can change that to 24.8.

Behdad@, any more opinions on this? 

> does Blink's Skia-HarfBuzz layer work in 16.16 fixed?

Do you mean the values that Blink passes to HarfBuzz from Skia? For which values? For variation axes? For advances? For most of the values, we use 
https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/fonts/skia/skia_text_metrics.cc?sq=package:chromium&dr=C&g=0&l=144

which is converting from float to hb_position_t using SkScalarToHbPosition()

ClusterFuzz has detected this issue as fixed in range 603031:603039.

Detailed report: https://clusterfuzz.com/testcase?key=5471279971565568

Fuzzer: inferno_twister
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  position_around_base
  position_cluster
  hb_ot_position
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=538214:538215
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=603031:603039

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5471279971565568

See https://github.com/google/clusterfuzz-tools 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 5471279971565568 is verified as fixed, so closing issue as verified.

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