10200 2006-08-02 00:15:39 -0700 [Drosera] Deadlock between Drosera and Safari while loading page 2008-05-17 09:55:56 -0700 1 1 1 Unclassified WebKit New Bugs 420+ Mac OS X 10.4 CLOSED FIXED HasReduction P2 Normal --- 1 mrowe timothy oldest_to_newest 51387 0 mrowe 2006-08-02 00:15:39 -0700 When loading the web archive (attachment 9807) attached to bug 10057 while Drosera is attached to Safari, Drosera and Safari will reproducibly get into a deadlock situation after continuing the first few JS exceptions that are raised. 51388 1 9808 mrowe 2006-08-02 00:18:21 -0700 Created attachment 9808 Backtrace from Drosera while deadlocked 51389 2 9809 mrowe 2006-08-02 00:18:51 -0700 Created attachment 9809 Backtrace from Safari while deadlocked 51390 3 9810 mrowe 2006-08-02 00:20:34 -0700 Created attachment 9810 Reduced test case Reduction of the page within the web archive that produces the deadlock. No plugins required. 51439 4 timothy 2006-08-02 09:03:47 -0700 I have an idea how to fix this. 51441 5 timothy 2006-08-02 09:28:17 -0700 I am testing a fix now. This testcase now works with no deadlock. The weird thing is our introspection script is showing up as a script from "about:blank". (function () { var result = new Array(); for (var x in this) { result.push(x); } return result; }) One interesting note: Unsafe JavaScript attempt to access frame with URL http://bugzilla.opendarwin.org/attachment.cgi?id=9810&action=view from frame with URL about:blank. Domains must match. Unsafe JavaScript attempt to access frame with URL http://bugzilla.opendarwin.org/attachment.cgi?id=9810&action=view from frame with URL about:blank. Domains must match. [3976] http://bugzilla.opendarwin.org/attachment.cgi?id=9810&action=view line 4: ReferenceError: Can't find variable: foo 51448 6 9824 timothy 2006-08-02 10:01:40 -0700 Created attachment 9824 Proposed fix Prevent reentrancy in our debugger callbacks. This was causing a deadlock in Drosera because suspendProcessIfPaused was being called during a DO call into Safari. Preventing reentrancy also prevents scripts that Drosera injects and evaluates from showing up in rare cases (such as a iframe loading about:blank). I thought this would prevent cases where you call a function from the console and expect it to break on a breakpoint in them, but this appears to never have worked even without this change. When that is figured out we can reconsider a better solution to reentrancy. I have filed that as bug 10214. I also removed the NSRunLoop runMode:beforeDate: calls since DO handles this for us since we don't use "onway void" as the return type for the callbacks. Note: using onway void for the listener callbacks causes bad synchronization issues and obscure crashes. * DefaultDelegates/WebScriptDebugServer.m: (-[WebScriptDebugServer webView:didLoadMainResourceForDataSource:]): (-[WebScriptDebugServer webView:didParseSource:baseLineNumber:fromURL:sourceId:forWebFrame:]): (-[WebScriptDebugServer webView:failedToParseSource:baseLineNumber:fromURL:withError:forWebFrame:]): (-[WebScriptDebugServer webView:didEnterCallFrame:sourceId:line:forWebFrame:]): (-[WebScriptDebugServer webView:willExecuteStatement:sourceId:line:forWebFrame:]): (-[WebScriptDebugServer webView:willLeaveCallFrame:sourceId:line:forWebFrame:]): (-[WebScriptDebugServer webView:exceptionWasRaised:sourceId:line:forWebFrame:]): * DefaultDelegates/WebScriptDebugServerPrivate.h: 51492 7 9824 darin 2006-08-02 16:03:51 -0700 Comment on attachment 9824 Proposed fix r=me 51494 8 timothy 2006-08-02 16:09:16 -0700 Landed in r15761. 80759 9 timothy 2008-05-17 09:55:56 -0700 Closing since Drosera has been replaced by the new Web Inspector debugger. Moving to the New Bugs component so the Drosera component can be closed and removed. 9808 2006-08-02 00:18:21 -0700 2006-08-02 00:18:21 -0700 Backtrace from Drosera while deadlocked webkit-bug-10200-drosera-backtrace.txt text/plain 3728 mrowe IzAgIDB4OTAwMGE1YzcgaW4gbWFjaF9tc2dfdHJhcCAoKQojMSAgMHg5MDAwYTUyOCBpbiBtYWNo X21zZyAoKQojMiAgMHg5MDgyMzY5YSBpbiBDRlJ1bkxvb3BSdW5TcGVjaWZpYyAoKQojMyAgMHg5 MDgyMmViNSBpbiBDRlJ1bkxvb3BSdW5Jbk1vZGUgKCkKIzQgIDB4OTI3Nzg1NTkgaW4gLVtOU0Nv bm5lY3Rpb24gc2VuZEludm9jYXRpb246XSAoKQojNSAgMHg5MjcyZjMyNCBpbiAtW05TT2JqZWN0 KE5TRm9yd2FyZEludm9jYXRpb24pIGZvcndhcmQ6Ol0gKCkKIzYgIDB4OTBhNTFiYTEgaW4gX29i amNfbXNnRm9yd2FyZCAoKQojNyAgMHgwMDAwMmIxNSBpbiAtW0RlYnVnZ2VyRG9jdW1lbnQgd2Vi U2NyaXB0QXR0cmlidXRlS2V5c0ZvclNjcmlwdE9iamVjdDpdIChzZWxmPTB4NDdmZDcwLCBfY21k PTB4NzBmOCwgb2JqZWN0PTB4MTY2MTA1NTApIGF0IC9Vc2Vycy9tcm93ZS9Eb2N1bWVudHMvU291 cmNlL1NWTi9XZWJLaXQtRGV2ZWwvV2ViS2l0VG9vbHMvRHJvc2VyYS9EZWJ1Z2dlckRvY3VtZW50 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