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Issue 831634 link

Starred by 1 user
Status: Verified
Owner:
█ trchen@chromium.org
Last visit > 30 days ago
Closed: May 2018
Cc:
wangxianzhu@chromium.org
ifratric@google.com
█ brajkumar@chromium.org
vmp...@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows
Pri: 1
Type: Bug-Regression

Blocking:
issue 771643



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Null-dereference READ in blink::ClipPaintPropertyNode const& blink::LowestCommonAncestor<blink::ClipPaint

Project Member Reported by ClusterFuzz, Apr 11 2018 
Detailed report: https://clusterfuzz.com/testcase?key=5862693685428224

Fuzzer: ifratric-browserfuzzer-v3
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000008
Crash State:
  blink::ClipPaintPropertyNode const& blink::LowestCommonAncestor<blink::ClipPaint
  blink::ConversionContext::SwitchToClip
  SwitchToChunkState
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=548850:548861

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5862693685428224

Issue filed automatically.

See https://github.com/google/clusterfuzz-tools for more information.
Project Member

Comment 1 by ClusterFuzz, Apr 11 2018

Components: Blink>Paint
Labels: Test-Predator-Auto-Components
Automatically applying components based on crash stacktrace and information from OWNERS files.

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

Comment 2 by brajkumar@chromium.org, Apr 12 2018

Cc: brajkumar@chromium.org
Labels: -Type-Bug M-67 Test-Predator-Wrong Type-Bug-Regression
Owner: wangxianzhu@chromium.org
Status: Assigned (was: Untriaged)
Predator and CL could not provide any possible suspects.

Using Code Search for the file, "paint_chunks_to_cc_layer.cc" suspecting the below Cl might have caused this issue

Suspect CL: https://chromium.googlesource.com/chromium/src/+/f10044d9de4a5be671ab9919e193fbaf1890812c%5E%21/third_party/WebKit/Source/platform/graphics/compositing/PaintChunksToCcLayer.cppc

wangxianzhu@ -- Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Thanks!

Comment 3 by wangxianzhu@chromium.org, Apr 12 2018

Cc: trchen@chromium.org
 Issue 828040  has been merged into this issue.

Comment 4 by wangxianzhu@chromium.org, Apr 12 2018

Blocking: 771643

Comment 5 by wangxianzhu@chromium.org, Apr 12 2018

Cc: -trchen@chromium.org wangxianzhu@chromium.org
Owner: trchen@chromium.org
Modified the test case and it can reproduce the crash stably. Seems related to clip-path.
clip-crash.html
719 bytes View Download
Project Member

Comment 6 by ClusterFuzz, Apr 12 2018

Labels: OS-Windows
Project Member

Comment 7 by ClusterFuzz, May 2 2018

Labels: ClusterFuzz-Verified
Status: Verified (was: Assigned)
ClusterFuzz testcase 5366889069674496 is verified as fixed, so closing issue as verified.

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

Comment 8 by wangxianzhu@chromium.org, May 2 2018 

The fix might be the patch for  bug 834296  or that for  bug 838528 . Both of the patches will be merged into M67.
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