I have been having this issue since last week. Tried to create a new AEM instance so I deleted the crx-quickstart folder and started AEM again. Everything went fine but when I tried to install the AEM service pack it could not be installed. The same behavior is happening for any package being installed through http://localhost:4502/crx/packmgr/index.jsp and I get the following error:
Also get the following error in logs whenever the above problem occurs:
*ERROR* [qtp1913257142-71] org.apache.jackrabbit.vault.packaging.impl.ZipVaultPackage Error during install.
at org.eclipse.jetty.server.ResponseWriter.isOpen(ResponseWriter.java:133) [org.apache.felix.http.jetty:4.0.8]
at org.eclipse.jetty.server.ResponseWriter.format(ResponseWriter.java:467) [org.apache.felix.http.jetty:4.0.8]
at org.eclipse.jetty.server.ResponseWriter.printf(ResponseWriter.java:439) [org.apache.felix.http.jetty:4.0.8]
at com.day.crx.packaging.impl.response.StreamedScriptResponse.writeCallback(StreamedScriptResponse.java:228) [com.adobe.granite.crx-packagemgr:1.2.74]
at com.day.crx.packaging.impl.response.StreamedScriptResponse.access$000(StreamedScriptResponse.java:44) [com.adobe.granite.crx-packagemgr:1.2.74]
at com.day.crx.packaging.impl.response.StreamedScriptResponse$1.flush(StreamedScriptResponse.java:82) [com.adobe.granite.crx-packagemgr:1.2.74]
at java.io.PrintWriter.flush(Unknown Source)...
There are more lines in error.log
I have tried starting AEM in a completely fresh browser such that not extensions interfere or any scripts don't get blocked. Still no luck. This problem started happening suddenly. There has been no change in the way I start new AEM instances and no change in code or my system's Java installation.
Meanwhile Adobe confirmed that this is a problem with the package manager. So Chrome is not to blame here (only because they implemented a slightly more strict sandboxing model).
This is tracked internally at GRANITE-30226 (Package Manager) and GRANITE-30280 (CRX DE) and the following bundle contains the fix: com.adobe.granite:com.adobe.granite.crx-packagemgr:1.2.100.
This is supposed to be contained in an upcoming ServicePack/Hotfix.