Bug 156586

Summary: Crash in JSC::SlotVisitor::setMarkedAndAppendToMarkStack when using Web Inspector on github.com
Product: WebKit Reporter: Adam Roben (:aroben) <aroben>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: jond
Priority: P2    
Version: Safari Technology Preview   
Hardware: Macintosh   
OS: OS X 10.11   
Description Flags
crash log none

Description Adam Roben (:aroben) 2016-04-14 12:03:01 PDT
Created attachment 276409 [details]
crash log

To reproduce:

1. Launch Safari Technology Preview (I'm using Version 9.1.1 (11601.6.15, 11602.1.27))
2. Go to https://github.com
3. Open the Web Inspector
4. Start record a timeline
5. Reload the page
6. Stop recording the timeline

Somewhere in there the web process will crash. Sometimes it's immediately upon opening the Inspector, other times it's when clicking Record, or when finishing the recording. The stack trace always looks basically the same. See attached crash log.