172739 2017-05-30 16:31:53 -0700 Null pointer crash when handling async with arrow operator 2017-05-30 23:37:48 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build Unspecified Unspecified RESOLVED DUPLICATE 171274 P2 Normal --- 1 natashenka webkit-unassigned fpizlo gskachkov saam ysuzuki oldest_to_newest 1313924 0 311551 natashenka 2017-05-30 16:31:53 -0700 Created attachment 311551 script causing the crash The following script crashes with a null pointer exception in JSC (also attached) . class BaseClass { constructor(x) { } }; class DeferredSuperCall extends BaseClass { constructor(x) { return async() => super(x); } }; var q = new DeferredSuperCall("LexicalSuperCall")(); 1313976 1 saam 2017-05-30 19:16:52 -0700 I think this is fixed as of today. Aleksandr, is this a dupe of what you fixed today? 1314099 2 gskachkov 2017-05-30 23:16:46 -0700 (In reply to Saam Barati from comment #1) > I think this is fixed as of today. Aleksandr, is this a dupe of what you > fixed today? Yes, it is the same as bug 171274 1314102 3 gskachkov 2017-05-30 23:37:48 -0700 (In reply to Natalie Silvanovich from comment #0) > Created attachment 311551 [details] > script causing the crash > > The following script crashes with a null pointer exception in JSC (also > attached) . > > class BaseClass { > constructor(x) { > > } > > }; > > class DeferredSuperCall extends BaseClass { > constructor(x) { > return async() => super(x); > } > }; > > var q = new DeferredSuperCall("LexicalSuperCall")(); Natalie, thanks for registering this issue. We just fixed this similar bug 171274 recently. As for now I can't reproduce your issue on latest Webkit nightly build, so I'm closing this task as duplicate. Could you please recheck if it fixed your issue on latest WebKit nightly or latest sources? *** This bug has been marked as a duplicate of bug 171274 *** 311551 2017-05-30 16:31:53 -0700 2017-05-30 16:31:53 -0700 script causing the crash supercrash.js application/javascript 209 natashenka Y2xhc3MgQmFzZUNsYXNzIHsKICBjb25zdHJ1Y3Rvcih4KSB7CgogIH0KCn07CgpjbGFzcyBEZWZl cnJlZFN1cGVyQ2FsbCBleHRlbmRzIEJhc2VDbGFzcyB7CiAgY29uc3RydWN0b3IoeCkgewogICAg cmV0dXJuIGFzeW5jKCkgPT4gc3VwZXIoeCk7CiAgfQp9OwoKdmFyIHEgPSAgbmV3IERlZmVycmVk U3VwZXJDYWxsKCJMZXhpY2FsU3VwZXJDYWxsIikoKTsKCgoKCgo=