137362 2014-10-02 15:03:12 -0700 [iOS] Networking process stops loading web pages while running Alexa test with random URL list 2014-10-02 16:41:34 -0700 1 1 1 Unclassified WebKit Platform 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 psolanki psolanki ap benjamin ddkilzer mhock psolanki oldest_to_newest 1038999 0 psolanki 2014-10-02 15:03:12 -0700 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. 1039000 1 psolanki 2014-10-02 15:03:27 -0700 <rdar://problem/18507382> 1039006 2 239147 psolanki 2014-10-02 15:15:51 -0700 Created attachment 239147 Patch 1039039 3 psolanki 2014-10-02 16:39:46 -0700 Committed r174244: <http://trac.webkit.org/changeset/174244> 239147 2014-10-02 15:15:51 -0700 2014-10-02 16:30:30 -0700 Patch bug-137362-20141002151552.patch text/plain 4504 psolanki U3VidmVyc2lvbiBSZXZpc2lvbjogMTc0MjI1CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNTdkYzYwMGU1OWRmMzA2 YjVkZTViZTBkZjYyOGIzZTk0Mzk4YmVkNS4uMGM3MWUyOWIxMzQ1MWM0NzU0YTUyODNjMzEzYzcw NTM3OTM1Y2FlYiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI1IEBACisyMDE0LTEwLTAyICBQcmF0 aWsgU29sYW5raSAgPHBzb2xhbmtpQGFwcGxlLmNvbT4KKworICAgICAgICBbaU9TXSBOZXR3b3Jr aW5nIHByb2Nlc3Mgc3RvcHMgbG9hZGluZyB3ZWIgcGFnZXMgd2hpbGUgcnVubmluZyBBbGV4YSB0 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