142191 2015-03-02 15:20:06 -0800 Exception stack unwinding in JSC hangs while the Timeline Profiler is enabled 2015-03-02 16:30:12 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 142189 1 mark.lam mark.lam burg joepeck timothy webkit-bug-importer oldest_to_newest 1073463 0 mark.lam 2015-03-02 15:20:06 -0800 Imagine a scenario where the Inspector is paused / suspended at a breakpoint or while the user is stepping through code. The user then tries to evaluate an expression in the console, and that evaluation results in an exception being thrown. Currently, if the Timeline Profiler is enabled while this exception is being thrown, the WebProcess will hang while trying to handle that exception. The issue is that the Timeline Profiler's ProfileGenerator::didExecute() will return early and decline to process ProfileNodes if the Inspector is paused. This is proper because it does not want to count work done for injected scripts (e.g. from the console) towards the timeline profile of the webpage being run. However, this is in conflict with ProfileGenerator::exceptionUnwind()'s expectation that didExecute() will process ProfileNodes in order to do the stack unwinding for the exception handling. As a result, ProfileGenerator::exceptionUnwind() hangs. ProfileGenerator::exceptionUnwind() is in error. While the Inspector is paused, there will not be any ProfileNodes that it needs to "unwind". Hence, the fix is simply to return early also in ProfileGenerator::exceptionUnwind() if the Inspector is paused. 1073465 1 mark.lam 2015-03-02 15:21:37 -0800 <rdar://problem/19891850> 1073491 2 247709 mark.lam 2015-03-02 15:54:44 -0800 Created attachment 247709 the patch. 1073502 3 247709 ggaren 2015-03-02 16:14:26 -0800 Comment on attachment 247709 the patch. r=me 1073512 4 mark.lam 2015-03-02 16:30:12 -0800 Thanks for the review. Landed in r180907: <http://trac.webkit.org/r180907>. Sorry for the botched commit message. Should have re-checked the diffs after I svn up'ed. 247709 2015-03-02 15:54:44 -0800 2015-03-02 16:14:26 -0800 the patch. bug-142191.patch text/plain 8184 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTgwOTAxKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDMzIEBA CisyMDE1LTAzLTAyICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBF eGNlcHRpb24gc3RhY2sgdW53aW5kaW5nIGluIEpTQyBoYW5ncyB3aGlsZSB0aGUgVGltZWxpbmUg UHJvZmlsZXIgaXMgZW5hYmxlZC4KKyAgICAgICAgPGh0dHBzOi8vd2Via2l0Lm9yZy9iLzE0MjE5 MT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBJbWFn aW5lIGEgc2NlbmFyaW8gd2hlcmUgdGhlIEluc3BlY3RvciBpcyBwYXVzZWQgLyBzdXNwZW5kZWQg YXQgYSBicmVha3BvaW50IG9yCisgICAgICAgIHdoaWxlIHRoZSB1c2VyIGlzIHN0ZXBwaW5nIHRo 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