[Webkit-unassigned] [Bug 156034] New: Non-deterministic JIT bug in Object.keys().reduce() affecting lodash/mapValues

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156034

            Bug ID: 156034
           Summary: Non-deterministic JIT bug in Object.keys().reduce()
                    affecting lodash/mapValues
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: benjamin at webkit.org, fpizlo at apple.com,
                    ggaren at apple.com

Reported on https://github.com/gaearon/normalizr/pull/82#issuecomment-203589131

Repro steps:
1. Open https://jsbin.com/coquxaduhu/1/edit?html,js,output
2. Wait for a few iterations until "looks okay" turns "missing entities.tweets".

There's a smaller js file reported to reproduce the same issue at:
https://github.com/gaearon/normalizr/pull/82#issuecomment-203590718

I'm sorry but I don't understand what this bug is about since the comments in the Github issue is super vague :(

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