Another swiftshader regression.

The "does not point to an object of type gl::Object" error appears to be caused by https://swiftshader.googlesource.com/SwiftShader.git/+/9ed48bae7a2ff600712a0b8672f2b7d5f33b453b

Which leads me to believe UBSAN doesn't know how to handle the [[clang::lto_visibility_public]] attribute or its effects. The class hierarchy itself didn't change in any way.

Peter, Nico, have you encountered something like this before?

I don't think that ubsan takes visibility into account (LTO or otherwise), so I'm not sure what's going on there. Can you still reproduce if you replace [[clang::lto_visibility_public]] with __attribute__((visibility("default"))) on the gl::Object class?

Reminder that M59 Stable is launch is coming soon (less than 2 weeks)! Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and get it merged into the release branch ASAP so it gets enough baking time in Beta (before Stable promotion). Thank you!

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/chrome/tools/clusterfuzz/+/43e2c0996f1c061de421f17670cdc7c188c04ec5

commit 43e2c0996f1c061de421f17670cdc7c188c04ec5
Author: Abhishek Arya <inferno@chromium.org>
Date: Fri May 19 03:46:27 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/411554280f5bd29fa6ca3d9565450c83869808c2

commit 411554280f5bd29fa6ca3d9565450c83869808c2
Author: mbarbella <mbarbella@chromium.org>
Date: Mon May 22 18:21:43 2017

Add UBSan vptr blacklist entries for swiftshader.

R=sugoi@chromium.org
TBR=scottmg@chromium.org
BUG= 722349 

Review-Url: https://codereview.chromium.org/2895763002
Cr-Commit-Position: refs/heads/master@{#473626}

[modify] https://crrev.com/411554280f5bd29fa6ca3d9565450c83869808c2/tools/ubsan/vptr_blacklist.txt

abdulsyed@, since this is a benign false positive in UBSan, I don't think this is a release blocker and won't need merging to the M59 branch. So I've removed the blocker label and lowered the priority. Feel free to put them back if you think it's worth merging anyway.