Bug 195892 – REGRESSION: (r243032) inspector/model/remote-object.html is failing.

• Status: RESOLVED
• Resolution: FIXED
• Component: Tools / Tests

[Truitt Savell]

The following layout test is failing on Mac

inspector/model/remote-object.html

Probable cause:

This test began failing near constantly after changes in https://trac.webkit.org/changeset/243032/webkit. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=inspector%2Fmodel%2Fremote-object.html

Diff:
https://build.webkit.org/results/Apple%20High%20Sierra%20Release%20WK1%20(Tests)/r243062%20(11965)/inspector/model/remote-object-diff.txt

I was able to reproduce this locally with command:
run-webkit-tests inspector/model/remote-object.html --iterations 100 -f

it fails often on 242032 but passes on 242031.

[Truitt Savell]

marked failing in https://trac.webkit.org/changeset/243071/webkit until mark can fix this.

[Radar WebKit Bug Importer]

<rdar://problem/48981239>

[Mark Lam]

Also from https://bugs.webkit.org/show_bug.cgi?id=195827#c8:

It appears that changes in https://trac.webkit.org/changeset/243032

Are causing a JSC failure on the Debug queue

microbenchmarks/data-view-accesses-2.js.ftl-no-cjit-small-pool

https://build.webkit.org/builders/Apple%20High%20Sierra%20Debug%20JSC%20%28Tests%29/builds/2348/steps/jscore-test/logs/stdio

Regression range is 243030 to 243033

[Mark Lam]

From the rollout ChangeLog:

The fix is incorrect: it relies on being able to determine liveness of an object in an ObjectPropertyCondition based on the state of the object's MarkedBit.  However, there's no guarantee that GC has run and that the MarkedBit is already set even if the object is live.  As a result, we may not re-install adaptive watchpoints based on presumed dead objects which are actually live.

I'm rolling this out, and will implement a more comprehensive fix to handle watchpoint liveness later.

[Mark Lam]

*** Bug 196008 has been marked as a duplicate of this bug. ***

[Mark Lam]

The rollout was landed in r243420: <http://trac.webkit.org/r243420>.