Bug 272400 – ASSERTION FAILED: Unhandled message WebSWServerConnection_PostMessageToServiceWorker to 0

• Status: RESOLVED
• Resolution: FIXED
• Component: Service Workers

[Alexey Proskuryakov]

Open source iOS simulator build always crashes MobileSafari with unhandled message assertion.

ASSERTION FAILED: Unhandled message WebSWServerConnection_PostMessageToServiceWorker to 0

This happens on a fresh simulator without any state, so this is just at the launch page, no website.

[Radar WebKit Bug Importer]

<rdar://problem/126136961>

[Alexey Proskuryakov]

This is on 277221@main, after `build-webkit --debug --ios-simulator` and `run-safari --debug --ios-simulator`.

[Ryosuke Niwa]

/Tools/Scripts/run-minibrowser --debug --ios-simulator hits the same issue.

[Ryosuke Niwa]

run-webkit-tests works, however.

[Ryosuke Niwa]

Hm... I can, however, launch MobileMiniBrowser.app from Xcode. As far as I can tell, it's loading the locally built WebKit although I can't attach lldb to a WebContent process launched this way for whatever reason.

[Ryosuke Niwa]

This appears to be caused by setupIOSWebKitEnvironment not setting __XPC_* environmental variables. Applying the following diff seems to solve this issue although trunk WebKit immediately hits a debug assertion trying to load any real web page. It can successfully load about:blank and some basic data URLs however.

diff --git a/Tools/Scripts/webkitdirs.pm b/Tools/Scripts/webkitdirs.pm
index abff7ad462a6..0042c11f70b8 100755
--- a/Tools/Scripts/webkitdirs.pm
+++ b/Tools/Scripts/webkitdirs.pm
@@ -2999,6 +2999,8 @@ sub setupIOSWebKitEnvironment($)
 
     prependToEnvironmentVariableList("DYLD_FRAMEWORK_PATH", $dyldFrameworkPath);
     prependToEnvironmentVariableList("DYLD_LIBRARY_PATH", $dyldFrameworkPath);
+    prependToEnvironmentVariableList("__XPC_DYLD_FRAMEWORK_PATH", $dyldFrameworkPath);
+    prependToEnvironmentVariableList("__XPC_DYLD_LIBRARY_PATH", $dyldFrameworkPath);
     prependToEnvironmentVariableList("METAL_DEVICE_WRAPPER_TYPE", "1");
 
     setUpGuardMallocIfNeeded();

[Ryosuke Niwa]

Pull request: https://github.com/WebKit/WebKit/pull/27068

[EWS]

Committed 277304@main (c1593e5d86c1): <https://commits.webkit.org/277304@main>

Reviewed commits have been landed. Closing PR #27068 and removing active labels.

[Alexey Proskuryakov]

*** Bug 272401 has been marked as a duplicate of this bug. ***