137813 2014-10-17 02:15:41 -0700 JSC::BlockAllocator::blockFreeingThreadMain() , too many thread be hang up. 2014-10-17 21:54:09 -0700 1 1 1 Unclassified WebKit JavaScriptCore 523.x (Safari 3) iPhone / iPad iOS 7.0 NEW P2 Normal --- 1 yauzz.scu webkit-unassigned fpizlo ggaren oldest_to_newest 1042332 0 240007 yauzz.scu 2014-10-17 02:15:41 -0700 Created attachment 240007 crashlytics log hi, my app have a crash in crashlytics.com. the reason is the -[ASIHTTPRequest runPACScript:] , but too many JSC thread be hang up before the crash. finally as the memory too low , the system abort. i search bug in webkit.org, example : https://bugs.webkit.org/show_bug.cgi?id=98084 https://bugs.webkit.org/show_bug.cgi?id=90622 it refer to the free block in gc , especially follow code is not perfect. void BlockAllocator::blockFreeingThreadMain() { while (!m_blockFreeingThreadShouldQuit) { // Generally wait for one second before scavenging free blocks. This // may return early, particularly when we're being asked to quit. waitForRelativeTime(1.0); if (m_blockFreeingThreadShouldQuit) break; so can you verify this question is the bug in jsc? and how to fix it ? 240007 2014-10-17 02:15:41 -0700 2014-10-17 02:15:41 -0700 crashlytics log crash.log application/octet-stream 6218 yauzz.scu VGhyZWFkIDogY29tLmFwcGxlLm1haW4tdGhyZWFkCjAgIGxpYnN5c3RlbV9rZXJuZWwuZHlsaWIg ICAgICAgICAweDM5Y2NiYTUwIG1hY2hfbXNnX3RyYXAgKyAyMAoxICBsaWJzeXN0ZW1fa2VybmVs LmR5bGliICAgICAgICAgMHgzOWNjYjg0ZCBtYWNoX21zZyArIDQwCjIgIENvcmVGb3VuZGF0aW9u ICAgICAgICAgICAgICAgICAweDJlZjVkNWU5IF9fQ0ZSdW5Mb29wU2VydmljZU1hY2hQb3J0ICsg MTU2CjMgIENvcmVGb3VuZGF0aW9uICAgICAgICAgICAgICAgICAweDJlZjViZDRmIF9fQ0ZSdW5M b29wUnVuICsgODYyCjQgIENvcmVGb3VuZGF0aW9uICAgICAgICAgICAgICAgICAweDJlZWM2NzI5 IENGUnVuTG9vcFJ1blNwZWNpZmljICsgNTI0CjUgIENvcmVGb3VuZGF0aW9uICAgICAgICAgICAg ICAgICAweDJlZWM2NTBiIENGUnVuTG9vcFJ1bkluTW9kZSArIDEwNgo2ICBHcmFwaGljc1NlcnZp 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