REGRESSION(r223729): Speedometer 2.0 React-Redux-TodoMVC throws TypeError: undefined is not an object (evaluating 'this.moveChild')

• Component: New Bugs
• Status: RESOLVED DUPLICATE

[Ryan Haddad]

Running Speedometer (181 of 181)
ERROR: CONSOLE MESSAGE: line 1: TypeError: undefined is not an object (evaluating 'this.moveChild')
FAILED
Finished: 42.359004 s

https://build.webkit.org/builders/Apple%20El%20Capitan%20Release%20WK2%20%28Perf%29/builds/1473

[Ryan Haddad]

The last successful run was r223712:
https://build.webkit.org/builders/Apple%20El%20Capitan%20Release%20WK2%20%28Perf%29/builds/1472

[Ryan Haddad]

It isn't clear to me from the error message what change caused this.

[Ryan Haddad]

https://trac.webkit.org/log/webkit/?action=stop_on_copy&mode=stop_on_copy&rev=223930&stop_rev=223913&limit=100&verbose=on

[Ryosuke Niwa]

Likely culprits:
https://trac.webkit.org/changeset/223715
https://trac.webkit.org/changeset/223720

[Ryosuke Niwa]

223727: ok

[Ryan Haddad]

(In reply to Ryan Haddad from comment #3)
> https://trac.webkit.org/log/webkit/
> ?action=stop_on_copy&mode=stop_on_copy&rev=223930&stop_rev=223913&limit=100&v
> erbose=on

Sorry for the confusion, this should have been:
https://trac.webkit.org/log/webkit/?action=stop_on_copy&mode=stop_on_copy&rev=223730&stop_rev=223713&limit=100&verbose=on

[Ryosuke Niwa]

Confirmed the regression doesn't exist at r223727.
"React-Redux-TodoMVC" is the one hitting this regression.

[Ryosuke Niwa]

Hm.... in my local testing, I can't reproduce this at r223728. Re-bisecting.

[Ryosuke Niwa]

Apparently, this is caused by https://trac.webkit.org/changeset/223729, which happens to enable the feature which was meant to be implemented by https://trac.webkit.org/changeset/223691

[Ryosuke Niwa]

The culprit was rolled out in https://trac.webkit.org/changeset/223989.

*** This bug has been marked as a duplicate of bug 178834 ***