This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

(Security Sheriff Triage)
rockot@-- this seems to have been caused by https://chromium-review.googlesource.com/584038 because that's the only mojo related CL in the regression range.
If you aren't the right owner, please help find them or mark the bug as Untriaged.

 Issue 749111  has been merged into this issue.

This is Pri-0, crashing MSAN builds on startup and blocking fuzzing. Please fix soon or revert CL for now.

The CL has already been reverted.

ClusterFuzz has detected this issue as fixed in range 489609:489658.

Detailed report: https://clusterfuzz.com/testcase?key=4742723386212352

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_msan_content_shell_drt
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  mojo::edk::ChannelPosix::WriteNoLock
  mojo::edk::ChannelPosix::Write
  mojo::edk::NodeChannel::SendChannelMessage
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=linux_msan_content_shell_drt&range=489319:489347
Fixed: https://clusterfuzz.com/revisions?job=linux_msan_content_shell_drt&range=489609:489658

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4742723386212352


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 4742723386212352 is verified as fixed, so closing issue as verified.

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

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot