36239 2010-03-17 13:03:41 -0700 [v8] Avoid reentry into v8 after TerminateExecution() on a worker thread. 2010-03-17 15:39:02 -0700 1 1 1 Unclassified WebKit WebCore JavaScript 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 36241 1 dimich dimich antonm atwilson dglazkov levin webkit.review.bot oldest_to_newest 200927 0 dimich 2010-03-17 13:03:41 -0700 V8 will crash or return Null values if used after v8::V8::TerminateExecution is invoked. We use it to terminate a worker. That exits JS stack but if the C++ code tries to execute JS again, crashes happen. For example, when worker has a MessagePort and receives a lot of messages, the MessagePort::dispatchMessages() will loop over accumulated messages and fire onmessage event. There are multiple places like that. So some sort of check for possible continuation should be made. The v8 exposes a instance-wide flag, IsExecutionTerminating(), and we have a flag in WorkerScritpController that indicates we have called TerminateExecution. I've looked over the code and realized that adding yet another check to various existing ones (valid proxy, canExecuteScripts, IsPaused etc) would only complicate things. Instead, it seems most JS execution requires to obtain a v8 context, in the form of WorkerContextExecutionProxy - and most places already check for it being 0 and bail out. So I've added a check for termination into WorkerScriptController::proxy() accessor and fixed up couple of places that didn't have check for 0. this way, we can stop v8 reentry w/o additional check sprinkled around. Patch coming. 200936 1 50947 dimich 2010-03-17 13:14:30 -0700 Created attachment 50947 Patch. 200937 2 webkit.review.bot 2010-03-17 13:18:58 -0700 Attachment 50947 did not build on chromium: Build output: http://webkit-commit-queue.appspot.com/results/845051 200938 3 dimich 2010-03-17 13:23:17 -0700 Please ignore Chromium EWS build failure - it is using older v8 revision. I'll submit updated DEPS for it before landing this patch, to avoid chromium build bot break. Separately, this patch went through chromium try bots on 3 platforms with green. 200956 4 50947 dglazkov 2010-03-17 13:55:25 -0700 Comment on attachment 50947 Patch. ok. 201009 5 dimich 2010-03-17 15:39:02 -0700 Landed: http://trac.webkit.org/changeset/56131 50947 2010-03-17 13:14:30 -0700 2010-03-17 13:55:25 -0700 Patch. patch.txt text/plain 7420 dimich ZGlmZiAtLWdpdCBhL0xheW91dFRlc3RzL0NoYW5nZUxvZyBiL0xheW91dFRlc3RzL0NoYW5nZUxv ZwppbmRleCA2ODU0YWU3Li4zZWJhYmNjIDEwMDY0NAotLS0gYS9MYXlvdXRUZXN0cy9DaGFuZ2VM b2cKKysrIGIvTGF5b3V0VGVzdHMvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTYgQEAKKzIwMTAtMDMt MTcgIERtaXRyeSBUaXRvdiAgPGRpbWljaEBjaHJvbWl1bS5vcmc+CisKKyAgICAgICAgUmV2aWV3 ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgW3Y4XSBBdm9pZCByZWVudHJ5IGludG8g djggYWZ0ZXIgVGVybWluYXRlRXhlY3V0aW9uKCkgb24gYSB3b3JrZXIgdGhyZWFkLgorICAgICAg ICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MzYyMzkKKworICAgICAg ICAqIGZhc3Qvd29ya2Vycy9yZXNvdXJjZXMvdGVybWluYXRpb24td2l0aC1wb3J0LW1lc3NhZ2Vz LmpzOiBBZGRlZC4KKyAgICAgICAgKGVjaG8pOgorICAgICAgICAob25tZXNzYWdlKToKKyAgICAg ICAgKiBmYXN0L3dvcmtlcnMvdGVybWluYXRpb24td2l0aC1wb3J0LW1lc3NhZ2VzLWV4cGVjdGVk LnR4dDogQWRkZWQuCisgICAgICAgICogZmFzdC93b3JrZXJzL3Rlcm1pbmF0aW9uLXdpdGgtcG9y dC1tZXNzYWdlcy5odG1sOiBBZGRlZC4KKwogMjAxMC0wMy0xNiAgSm9obiBBYmQtRWwtTWFsZWsg IDxqYW1AY2hyb21pdW0ub3JnPgogCiAgICAgICAgIFJldmlld2VkIGJ5IERhcmluIEZpc2hlci4K ZGlmZiAtLWdpdCBhL0xheW91dFRlc3RzL2Zhc3Qvd29ya2Vycy9yZXNvdXJjZXMvdGVybWluYXRp b24td2l0aC1wb3J0LW1lc3NhZ2VzLmpzIGIvTGF5b3V0VGVzdHMvZmFzdC93b3JrZXJzL3Jlc291 cmNlcy90ZXJtaW5hdGlvbi13aXRoLXBvcnQtbWVzc2FnZXMuanMKbmV3IGZpbGUgbW9kZSAxMDA2 NDQKaW5kZXggMDAwMDAwMC4uYTgyN2RiMwotLS0gL2Rldi9udWxsCisrKyBiL0xheW91dFRlc3Rz L2Zhc3Qvd29ya2Vycy9yZXNvdXJjZXMvdGVybWluYXRpb24td2l0aC1wb3J0LW1lc3NhZ2VzLmpz CkBAIC0wLDAgKzEsMTAgQEAKK2Z1bmN0aW9uIGVjaG8oZXZ0KQoreworICAgIGV2dC50YXJnZXQu cG9zdE1lc3NhZ2UoZXZ0LmRhdGEpOworfQorCitvbm1lc3NhZ2UgPSBmdW5jdGlvbihldnQpCit7 CisgICAgZXZ0LnBvcnRzWzBdLm9ubWVzc2FnZSA9IGVjaG87CisgICAgZXZ0LnBvcnRzWzBdLnN0 YXJ0KCk7Cit9CmRpZmYgLS1naXQgYS9MYXlvdXRUZXN0cy9mYXN0L3dvcmtlcnMvdGVybWluYXRp b24td2l0aC1wb3J0LW1lc3NhZ2VzLWV4cGVjdGVkLnR4dCBiL0xheW91dFRlc3RzL2Zhc3Qvd29y a2Vycy90ZXJtaW5hdGlvbi13aXRoLXBvcnQtbWVzc2FnZXMtZXhwZWN0ZWQudHh0Cm5ldyBmaWxl IG1vZGUgMTAwNjQ0CmluZGV4IDAwMDAwMDAuLjdhZThkMjkKLS0tIC9kZXYvbnVsbAorKysgYi9M YXlvdXRUZXN0cy9mYXN0L3dvcmtlcnMvdGVybWluYXRpb24td2l0aC1wb3J0LW1lc3NhZ2VzLWV4 cGVjdGVkLnR4dApAQCAtMCwwICsxIEBACitUaGlzIHRlc3QgdGVybWluYXRlcyBhIHdvcmtlciB3 aGVuIHRoZXJlIGFyZSBtYW55IHVuZGVsaXZlcmVkIE1lc3NhZ2VQb3J0IG1lc3NhZ2VzIHN0aWxs IHdhaXRpbmcgdG8gYmUgZGlzcGF0Y2hlZCBpbnRvIHRoZSBXb3JrZXIgQ29udGV4dC4gVGhpcyBj YXVzZXMgdGVybWluYXRpb24gb2YgSlMgZXhlY3V0aW9uIGFuZCB0ZXN0IHNob3VsZCBub3QgdHJ5 IHRvIGRpc3BhdGNoIHRoZSByZW1haW5pbmcgbWVzc2FnZXMuIFRlc3Qgc3VjY2VlZHMgaWYgaXQg ZG9lcyBub3QgaGFuZyBvciBjcmFzaCAoaWYgd29ya2VyIHRocmVhZCBpcyBydW5uaW5nIGluIHRo ZSBzZXBhcmF0ZSBwcm9jZXNzLCB0aGF0IHByb2Nlc3MgY291bGQgaGFuZyBvciBjcmFzaCkuCmRp ZmYgLS1naXQgYS9MYXlvdXRUZXN0cy9mYXN0L3dvcmtlcnMvdGVybWluYXRpb24td2l0aC1wb3J0 LW1lc3NhZ2VzLmh0bWwgYi9MYXlvdXRUZXN0cy9mYXN0L3dvcmtlcnMvdGVybWluYXRpb24td2l0 aC1wb3J0LW1lc3NhZ2VzLmh0bWwKbmV3IGZpbGUgbW9kZSAxMDA2NDQKaW5kZXggMDAwMDAwMC4u NDViYWI3ZAotLS0gL2Rldi9udWxsCisrKyBiL0xheW91dFRlc3RzL2Zhc3Qvd29ya2Vycy90ZXJt aW5hdGlvbi13aXRoLXBvcnQtbWVzc2FnZXMuaHRtbApAQCAtMCwwICsxLDI4IEBACis8c2NyaXB0 PgorZnVuY3Rpb24gdGVzdCgpCit7CisgICAgaWYgKHdpbmRvdy5sYXlvdXRUZXN0Q29udHJvbGxl cikgeworICAgICAgICBsYXlvdXRUZXN0Q29udHJvbGxlci5kdW1wQXNUZXh0KCk7CisgICAgICAg IGxheW91dFRlc3RDb250cm9sbGVyLndhaXRVbnRpbERvbmUoKTsKKyAgICB9CisKKyAgICB2YXIg d29ya2VyID0gbmV3IFdvcmtlcigicmVzb3VyY2VzL3Rlcm1pbmF0aW9uLXdpdGgtcG9ydC1tZXNz YWdlcy5qcyIpOworICAgIHZhciBjaGFubmVsID0gbmV3IE1lc3NhZ2VDaGFubmVsKCk7CisKKyAg ICBjaGFubmVsLnBvcnQyLm9ubWVzc2FnZSA9IGZ1bmN0aW9uKGV2dCkKKyAgICB7CisgICAgICAg IC8vIE9uIGZpcnN0IG1lc3NhZ2UgYmFjayBmcm9tIHdvcmtlciwgdGVybWluYXRlIGl0LgorICAg ICAgICB3b3JrZXIudGVybWluYXRlKCk7CisgICAgICAgIGlmICh3aW5kb3cubGF5b3V0VGVzdENv bnRyb2xsZXIpCisgICAgICAgICAgICBzZXRUaW1lb3V0KCJsYXlvdXRUZXN0Q29udHJvbGxlci5u b3RpZnlEb25lKCk7IiwgMCk7CisgICAgfQorICAgIGNoYW5uZWwucG9ydDIuc3RhcnQoKTsKKwor ICAgIHdvcmtlci5wb3N0TWVzc2FnZSgiIiwgW2NoYW5uZWwucG9ydDFdKTsKKyAgICBmb3IgKGkg PSAwOyBpIDwgMTAwMDsgaSsrKQorICAgICAgICBjaGFubmVsLnBvcnQyLnBvc3RNZXNzYWdlKCJt ZXNzYWdlIHRvIHdvcmtlciIpOworfQorPC9zY3JpcHQ+Cis8Ym9keSBvbmxvYWQ9dGVzdCgpPgor PHA+VGhpcyB0ZXN0IHRlcm1pbmF0ZXMgYSB3b3JrZXIgd2hlbiB0aGVyZSBhcmUgbWFueSB1bmRl bGl2ZXJlZCBNZXNzYWdlUG9ydCBtZXNzYWdlcyBzdGlsbCB3YWl0aW5nIHRvIGJlIGRpc3BhdGNo ZWQgaW50byB0aGUgV29ya2VyIENvbnRleHQuIFRoaXMgY2F1c2VzIHRlcm1pbmF0aW9uIG9mIEpT IGV4ZWN1dGlvbiBhbmQgdGVzdCBzaG91bGQgbm90IHRyeSB0byBkaXNwYXRjaCB0aGUgcmVtYWlu aW5nIG1lc3NhZ2VzLiBUZXN0IHN1Y2NlZWRzIGlmIGl0IGRvZXMgbm90IGhhbmcgb3IgY3Jhc2gg KGlmIHdvcmtlciB0aHJlYWQgaXMgcnVubmluZyBpbiB0aGUgc2VwYXJhdGUgcHJvY2VzcywgdGhh dCBwcm9jZXNzIGNvdWxkIGhhbmcgb3IgY3Jhc2gpLjwvcD4KKzwvYm9keT4KZGlmZiAtLWdpdCBh L1dlYkNvcmUvQ2hhbmdlTG9nIGIvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZDc5Y2MzNC4uZTkx NDk5NiAxMDA2NDQKLS0tIGEvV2ViQ29yZS9DaGFuZ2VMb2cKKysrIGIvV2ViQ29yZS9DaGFuZ2VM b2cKQEAgLTEsMyArMSwyMCBAQAorMjAxMC0wMy0xNyAgRG1pdHJ5IFRpdG92ICA8ZGltaWNoQGNo cm9taXVtLm9yZz4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAg ICAgICBbdjhdIEF2b2lkIHJlZW50cnkgaW50byB2OCBhZnRlciBUZXJtaW5hdGVFeGVjdXRpb24o KSBvbiBhIHdvcmtlciB0aHJlYWQuCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3No b3dfYnVnLmNnaT9pZD0zNjIzOQorCisgICAgICAgIFRlc3Q6IGZhc3Qvd29ya2Vycy90ZXJtaW5h dGlvbi13aXRoLXBvcnQtbWVzc2FnZXMuaHRtbAorCisgICAgICAgICogYmluZGluZ3MvdjgvVjhQ cm94eS5oOgorICAgICAgICAoV2ViQ29yZTo6dGhyb3dFcnJvcik6IEF2b2lkIHRocm93aW5nIGlm IHY4IGV4ZWN1dGlvbiBpcyB0ZXJtaW5hdGVkIGFueXdheXMuCisgICAgICAgICogYmluZGluZ3Mv djgvV29ya2VyU2NyaXB0Q29udHJvbGxlci5oOgorICAgICAgICAoV2ViQ29yZTo6V29ya2VyU2Ny aXB0Q29udHJvbGxlcjo6cHJveHkpOiBSZXR1cm4gVjggcHJveHkgYXMgMCBpZiBleGVjdXRpb24g aXMgdGVybWluYXRpbmcuIENhbGxlcnMgdG8gY2hlY2sgZm9yIDAgYmVmb3JlIGludm9raW5nIHY4 LgorICAgICAgICAqIGJpbmRpbmdzL3Y4L2N1c3RvbS9WOFdvcmtlckNvbnRleHRDdXN0b20uY3Bw OgorICAgICAgICAoV2ViQ29yZTo6U2V0VGltZW91dE9ySW50ZXJ2YWwpOiBCYWlsIG91dCBpZiB2 OCBwcm94eSBpcyAwLgorICAgICAgICAoV2ViQ29yZTo6dG9WOCk6IERpdHRvCisKIDIwMTAtMDMt MTYgIEpvaG4gQWJkLUVsLU1hbGVrICA8amFtQGNocm9taXVtLm9yZz4KIAogICAgICAgICBSZXZp ZXdlZCBieSBEYXJpbiBGaXNoZXIuCmRpZmYgLS1naXQgYS9XZWJDb3JlL2JpbmRpbmdzL3Y4L1Y4 UHJveHkuaCBiL1dlYkNvcmUvYmluZGluZ3MvdjgvVjhQcm94eS5oCmluZGV4IGEzZGExNTUuLjE0 YzZiNGEgMTAwNjQ0Ci0tLSBhL1dlYkNvcmUvYmluZGluZ3MvdjgvVjhQcm94eS5oCisrKyBiL1dl YkNvcmUvYmluZGluZ3MvdjgvVjhQcm94eS5oCkBAIC00MzcsMTkgKzQzNywyMiBAQCBuYW1lc3Bh Y2UgV2ViQ29yZSB7CiAgICAgfQogICAgIGlubGluZSB2ODo6SGFuZGxlPHY4OjpQcmltaXRpdmU+ IHRocm93RXJyb3IoY29uc3QgY2hhciogbWVzc2FnZSwgVjhQcm94eTo6RXJyb3JUeXBlIHR5cGUg PSBWOFByb3h5OjpUeXBlRXJyb3IpCiAgICAgewotICAgICAgICBWOFByb3h5Ojp0aHJvd0Vycm9y KHR5cGUsIG1lc3NhZ2UpOworICAgICAgICBpZiAoIXY4OjpWODo6SXNFeGVjdXRpb25UZXJtaW5h dGluZygpKQorICAgICAgICAgICAgVjhQcm94eTo6dGhyb3dFcnJvcih0eXBlLCBtZXNzYWdlKTsK ICAgICAgICAgcmV0dXJuIHY4OjpVbmRlZmluZWQoKTsKICAgICB9CiAKICAgICBpbmxpbmUgdjg6 OkhhbmRsZTx2ODo6UHJpbWl0aXZlPiB0aHJvd0Vycm9yKEV4Y2VwdGlvbkNvZGUgZWMpCiAgICAg ewotICAgICAgICBWOFByb3h5OjpzZXRET01FeGNlcHRpb24oZWMpOworICAgICAgICBpZiAoIXY4 OjpWODo6SXNFeGVjdXRpb25UZXJtaW5hdGluZygpKQorICAgICAgICAgICAgVjhQcm94eTo6c2V0 RE9NRXhjZXB0aW9uKGVjKTsKICAgICAgICAgcmV0dXJuIHY4OjpVbmRlZmluZWQoKTsKICAgICB9 CiAKICAgICBpbmxpbmUgdjg6OkhhbmRsZTx2ODo6UHJpbWl0aXZlPiB0aHJvd0Vycm9yKHY4OjpM b2NhbDx2ODo6VmFsdWU+IGV4Y2VwdGlvbikKICAgICB7Ci0gICAgICAgIHY4OjpUaHJvd0V4Y2Vw dGlvbihleGNlcHRpb24pOworICAgICAgICBpZiAoIXY4OjpWODo6SXNFeGVjdXRpb25UZXJtaW5h dGluZygpKQorICAgICAgICAgICAgdjg6OlRocm93RXhjZXB0aW9uKGV4Y2VwdGlvbik7CiAgICAg ICAgIHJldHVybiB2ODo6VW5kZWZpbmVkKCk7CiAgICAgfQogCmRpZmYgLS1naXQgYS9XZWJDb3Jl L2JpbmRpbmdzL3Y4L1dvcmtlclNjcmlwdENvbnRyb2xsZXIuaCBiL1dlYkNvcmUvYmluZGluZ3Mv djgvV29ya2VyU2NyaXB0Q29udHJvbGxlci5oCmluZGV4IDA3ZTIyNGMuLmQzNzRlZDggMTAwNjQ0 Ci0tLSBhL1dlYkNvcmUvYmluZGluZ3MvdjgvV29ya2VyU2NyaXB0Q29udHJvbGxlci5oCisrKyBi L1dlYkNvcmUvYmluZGluZ3MvdjgvV29ya2VyU2NyaXB0Q29udHJvbGxlci5oCkBAIC00OCw3ICs0 OCw3IEBAIG5hbWVzcGFjZSBXZWJDb3JlIHsKICAgICAgICAgV29ya2VyU2NyaXB0Q29udHJvbGxl cihXb3JrZXJDb250ZXh0Kik7CiAgICAgICAgIH5Xb3JrZXJTY3JpcHRDb250cm9sbGVyKCk7CiAK LSAgICAgICAgV29ya2VyQ29udGV4dEV4ZWN1dGlvblByb3h5KiBwcm94eSgpIHsgcmV0dXJuIG1f cHJveHkuZ2V0KCk7IH0KKyAgICAgICAgV29ya2VyQ29udGV4dEV4ZWN1dGlvblByb3h5KiBwcm94 eSgpIHsgcmV0dXJuIG1fZXhlY3V0aW9uRm9yYmlkZGVuID8gMCA6IG1fcHJveHkuZ2V0KCk7IH0K IAogICAgICAgICBTY3JpcHRWYWx1ZSBldmFsdWF0ZShjb25zdCBTY3JpcHRTb3VyY2VDb2RlJik7 CiAgICAgICAgIFNjcmlwdFZhbHVlIGV2YWx1YXRlKGNvbnN0IFNjcmlwdFNvdXJjZUNvZGUmLCBT Y3JpcHRWYWx1ZSogZXhjZXB0aW9uKTsKZGlmZiAtLWdpdCBhL1dlYkNvcmUvYmluZGluZ3Mvdjgv Y3VzdG9tL1Y4V29ya2VyQ29udGV4dEN1c3RvbS5jcHAgYi9XZWJDb3JlL2JpbmRpbmdzL3Y4L2N1 c3RvbS9WOFdvcmtlckNvbnRleHRDdXN0b20uY3BwCmluZGV4IDA2OTBiMDcuLjgwNDA2N2IgMTAw NjQ0Ci0tLSBhL1dlYkNvcmUvYmluZGluZ3MvdjgvY3VzdG9tL1Y4V29ya2VyQ29udGV4dEN1c3Rv bS5jcHAKKysrIGIvV2ViQ29yZS9iaW5kaW5ncy92OC9jdXN0b20vVjhXb3JrZXJDb250ZXh0Q3Vz dG9tLmNwcApAQCAtNTgsNyArNTgsMTEgQEAgdjg6OkhhbmRsZTx2ODo6VmFsdWU+IFNldFRpbWVv dXRPckludGVydmFsKGNvbnN0IHY4OjpBcmd1bWVudHMmIGFyZ3MsIGJvb2wgc2luZ2wKICAgICBp bnQzMl90IHRpbWVvdXQgPSBhcmd1bWVudENvdW50ID49IDIgPyBhcmdzWzFdLT5JbnQzMlZhbHVl KCkgOiAwOwogICAgIGludCB0aW1lcklkOwogCi0gICAgdjg6OkhhbmRsZTx2ODo6Q29udGV4dD4g djhDb250ZXh0ID0gd29ya2VyQ29udGV4dC0+c2NyaXB0KCktPnByb3h5KCktPmNvbnRleHQoKTsK KyAgICBXb3JrZXJDb250ZXh0RXhlY3V0aW9uUHJveHkqIHByb3h5ID0gd29ya2VyQ29udGV4dC0+ c2NyaXB0KCktPnByb3h5KCk7CisgICAgaWYgKCFwcm94eSkKKyAgICAgICAgcmV0dXJuIHY4OjpV bmRlZmluZWQoKTsKKworICAgIHY4OjpIYW5kbGU8djg6OkNvbnRleHQ+IHY4Q29udGV4dCA9IHBy b3h5LT5jb250ZXh0KCk7CiAgICAgaWYgKGZ1bmN0aW9uLT5Jc1N0cmluZygpKSB7CiAgICAgICAg IFdlYkNvcmU6OlN0cmluZyBzdHJpbmdGdW5jdGlvbiA9IHRvV2ViQ29yZVN0cmluZyhmdW5jdGlv bik7CiAgICAgICAgIHRpbWVySWQgPSBET01UaW1lcjo6aW5zdGFsbCh3b3JrZXJDb250ZXh0LCBu ZXcgU2NoZWR1bGVkQWN0aW9uKHY4Q29udGV4dCwgc3RyaW5nRnVuY3Rpb24sIHdvcmtlckNvbnRl eHQtPnVybCgpKSwgdGltZW91dCwgc2luZ2xlU2hvdCk7CkBAIC0xMzEsNyArMTM1LDExIEBAIHY4 OjpIYW5kbGU8djg6OlZhbHVlPiB0b1Y4KFdvcmtlckNvbnRleHQqIGltcGwpCiAgICAgaWYgKCFp bXBsKQogICAgICAgICByZXR1cm4gdjg6Ok51bGwoKTsKIAotICAgIHY4OjpIYW5kbGU8djg6Ok9i amVjdD4gZ2xvYmFsID0gaW1wbC0+c2NyaXB0KCktPnByb3h5KCktPmNvbnRleHQoKS0+R2xvYmFs KCk7CisgICAgV29ya2VyQ29udGV4dEV4ZWN1dGlvblByb3h5KiBwcm94eSA9IGltcGwtPnNjcmlw dCgpLT5wcm94eSgpOworICAgIGlmICghcHJveHkpCisgICAgICAgIHJldHVybiB2ODo6TnVsbCgp OworCisgICAgdjg6OkhhbmRsZTx2ODo6T2JqZWN0PiBnbG9iYWwgPSBwcm94eS0+Y29udGV4dCgp LT5HbG9iYWwoKTsKICAgICBBU1NFUlQoIWdsb2JhbC5Jc0VtcHR5KCkpOwogICAgIHJldHVybiBn bG9iYWw7CiB9Cg==