[Webkit-unassigned] [Bug 137362] New: [iOS] Networking process stops loading web pages while running Alexa test with random URL list

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=137362

           Summary: [iOS] Networking process stops loading web pages while
                    running Alexa test with random URL list
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: psolanki at apple.com
                CC: ap at webkit.org, ddkilzer at webkit.org,
                    benjamin at webkit.org


The networking process stops loading pages after some hours of loading random Alexa urls. When this happens we noticed that the process had hit its limit of dispatch queue threads - we had 64 com.apple.WebKit/CFNetwork threads in the Networking process. Networking comes to a stall and no progress is made until the process is killed and restarted. This can happen if ResourceHandleCFURLConnectionDelegateWithOperationQueue code is waiting for a semaphore signal and the web process dies. The cleanup code for ResourceHandleCFURLConnectionDelegateWithOperationQueue does not signal the semaphore and thus the thread just hangs around forever. Eventually, we can accumulate enough threads to hit the queue thread limit.

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