[jira] [Comment Edited] (NETBEANS-58) NB IDE or NB Platform freeze on startup (proxy with Negotiate auth)
[
https://issues.apache.org/jira/browse/NETBEANS-58?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17053551#comment-17053551
]
Isaac edited comment on NETBEANS-58 at 3/6/20, 4:23 PM:
The [underlying OpenJDK bug|https://bugs.openjdk.java.net/browse/JDK-8068184]
has now closed with a fix version of Java 14. The fix is going to be backported
to Java 7, 8 and 11. Let's see if the fix works.
was (Author: isaac):
The [underlying OpenJDK bug|https://bugs.openjdk.java.net/browse/JDK-8068184]
has now closed with a fix version of Java 14. The fix is going to be backported
to Java 8. Let's see if the fix works.
> NB IDE or NB Platform freeze on startup (proxy with Negotiate auth)
> ---
>
> Key: NETBEANS-58
> URL: https://issues.apache.org/jira/browse/NETBEANS-58
> Project: NetBeans
> Issue Type: Bug
> Components: platform - Proxy
>Affects Versions: 8.2, 9.0, 11.0
> Environment: Primarily Windows.
>Reporter: phansson
>Priority: Critical
> Attachments: NETBEANS-58-workaround1.diff,
> image-2018-04-24-15-57-47-592.png, nb-freeze-dump.txt, netbeans.txt
>
>
> When any network operation is performed, such as attempting to contact
> NetBeans Update Center, the application (IDE or Platform) may freeze. Users
> will typically experience this on startup. It was reported in old bug tracker
> as [bug 248308|https://netbeans.org/bugzilla/show_bug.cgi?id=248308].
> The problem arises because of the fix JDK folks applied as a consequence of
> the reported [JDK-8032832
> bug|https://bugs.openjdk.java.net/browse/JDK-8032832]. This fix wasn't very
> clever IMO: it puts a lock on the classloader, thus introducing a range of
> other problems, one of them being that NetNeans IDE or NetBeans Platform will
> likely freeze on startup when it attempts a network operation. The fact that
> their fix made things worse (while no doubt fixing the original issue) has
> been reported as
> [JDK-8068184|https://bugs.openjdk.java.net/browse/JDK-8068184].
> h3. WHEN DOES IT HAPPEN?
> As the lock is introduced for authentication of type 'Negotiate' it of course
> only happens if there's a network proxy on the path which uses this type of
> authentication. Also known as SPNEGO. This form of authentication is in my
> experience very common in corporate networks, in particular those that base
> themselves on the Microsoft stack. But a person on Oracle's own internal
> network, such as a JDK developer, is most likely not exposed to it. :-)
> There's another condition for it to happen: The JRE runtime must be unable to
> provide 'credentials' (a Kerberos token) to the network proxy on its own.
> SPNEGO is really designed to be seamless and promptless. Support for it was
> added in Java 6. But later on Microsoft tightened the desktop security around
> obtaining the so-called 'session token' and the JDK folks were never able to
> work around this (unlike the makers of Chrome, FF, Opera, etc). Therefore, in
> real-life, SPNEGO in the JRE on Windows is no longer promptless: it will be
> forced to ask the user for credentials, thus negating the idea of SPNEGO. It
> is the prompting which causes the freeze. SPNEGO on Mac OS X and Linux is
> most likely working just fine and the bug will never be experienced.
> h3. HOW DO I KNOW IF I'M AFFECTED BY EXACTLY THIS BUG?
> This bug in this ticket is characterized by the fact that you'll always be
> able to find the following in your thread dump:
> {noformat}
>at
> sun.net.www.protocol.http.NegotiateAuthentication.isSupported(NegotiateAuthentication.java:)
> - locked (a org.netbeans.ModuleManager$SystemClassLoader)
> {noformat}
> Note that the [Ctrl-Break
> method|https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr019.html]
> of obtaining a thread dump is favoured over jstack and other methods.
> h3. WHY DOES IT HAPPEN?
> There will be a lock held on the classloader object when the JRE's registered
> Authenticator is invoked. If the Authenticator does work on another thread,
> that other thread has a need for some classloading and the current thread
> needs to wait for the result of that thread, then bum!, there's a deadlock
> between the two threads. This means the lock on the classloader will never be
> released and it will ultimately affect other threads, such as the AWT
> dispatch thread (aka Swing EDT) which will then also lock. Then you have what
> the user experiences as a freeze.
> The NB Platform's own Authenticator, {{NbAuthenticator}}, does exactly what I
> described and will thus be triggering the deadlock. More precisely it will
> happen when NbAuthenticator calls Keyring. Does this mean the NbAuthenticator
> does something wrong? No, of course it doesn't. The real
[jira] [Comment Edited] (NETBEANS-58) NB IDE or NB Platform freeze on startup (proxy with Negotiate auth)
[
https://issues.apache.org/jira/browse/NETBEANS-58?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17053551#comment-17053551
]
Isaac edited comment on NETBEANS-58 at 3/6/20, 4:22 PM:
The [underlying OpenJDK bug|https://bugs.openjdk.java.net/browse/JDK-8068184]
has now closed with a fix version of Java 14. The fix is going to be backported
to Java 8. Let's see if the fix works.
was (Author: isaac):
The [underlying OpenJDK bug|https://bugs.openjdk.java.net/browse/JDK-8068184]
has now closed with a fix version of Java 14. The fix has also been backported
to Java 8. Can those experiencing the issue update to a fixed version of JRE
and try again?
> NB IDE or NB Platform freeze on startup (proxy with Negotiate auth)
> ---
>
> Key: NETBEANS-58
> URL: https://issues.apache.org/jira/browse/NETBEANS-58
> Project: NetBeans
> Issue Type: Bug
> Components: platform - Proxy
>Affects Versions: 8.2, 9.0, 11.0
> Environment: Primarily Windows.
>Reporter: phansson
>Priority: Critical
> Attachments: NETBEANS-58-workaround1.diff,
> image-2018-04-24-15-57-47-592.png, nb-freeze-dump.txt, netbeans.txt
>
>
> When any network operation is performed, such as attempting to contact
> NetBeans Update Center, the application (IDE or Platform) may freeze. Users
> will typically experience this on startup. It was reported in old bug tracker
> as [bug 248308|https://netbeans.org/bugzilla/show_bug.cgi?id=248308].
> The problem arises because of the fix JDK folks applied as a consequence of
> the reported [JDK-8032832
> bug|https://bugs.openjdk.java.net/browse/JDK-8032832]. This fix wasn't very
> clever IMO: it puts a lock on the classloader, thus introducing a range of
> other problems, one of them being that NetNeans IDE or NetBeans Platform will
> likely freeze on startup when it attempts a network operation. The fact that
> their fix made things worse (while no doubt fixing the original issue) has
> been reported as
> [JDK-8068184|https://bugs.openjdk.java.net/browse/JDK-8068184].
> h3. WHEN DOES IT HAPPEN?
> As the lock is introduced for authentication of type 'Negotiate' it of course
> only happens if there's a network proxy on the path which uses this type of
> authentication. Also known as SPNEGO. This form of authentication is in my
> experience very common in corporate networks, in particular those that base
> themselves on the Microsoft stack. But a person on Oracle's own internal
> network, such as a JDK developer, is most likely not exposed to it. :-)
> There's another condition for it to happen: The JRE runtime must be unable to
> provide 'credentials' (a Kerberos token) to the network proxy on its own.
> SPNEGO is really designed to be seamless and promptless. Support for it was
> added in Java 6. But later on Microsoft tightened the desktop security around
> obtaining the so-called 'session token' and the JDK folks were never able to
> work around this (unlike the makers of Chrome, FF, Opera, etc). Therefore, in
> real-life, SPNEGO in the JRE on Windows is no longer promptless: it will be
> forced to ask the user for credentials, thus negating the idea of SPNEGO. It
> is the prompting which causes the freeze. SPNEGO on Mac OS X and Linux is
> most likely working just fine and the bug will never be experienced.
> h3. HOW DO I KNOW IF I'M AFFECTED BY EXACTLY THIS BUG?
> This bug in this ticket is characterized by the fact that you'll always be
> able to find the following in your thread dump:
> {noformat}
>at
> sun.net.www.protocol.http.NegotiateAuthentication.isSupported(NegotiateAuthentication.java:)
> - locked (a org.netbeans.ModuleManager$SystemClassLoader)
> {noformat}
> Note that the [Ctrl-Break
> method|https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr019.html]
> of obtaining a thread dump is favoured over jstack and other methods.
> h3. WHY DOES IT HAPPEN?
> There will be a lock held on the classloader object when the JRE's registered
> Authenticator is invoked. If the Authenticator does work on another thread,
> that other thread has a need for some classloading and the current thread
> needs to wait for the result of that thread, then bum!, there's a deadlock
> between the two threads. This means the lock on the classloader will never be
> released and it will ultimately affect other threads, such as the AWT
> dispatch thread (aka Swing EDT) which will then also lock. Then you have what
> the user experiences as a freeze.
> The NB Platform's own Authenticator, {{NbAuthenticator}}, does exactly what I
> described and will thus be triggering the deadlock. More precisely it will
> happen when NbAuthenticator calls Keyring. Does this mean the NbAuthenticator
> does something
[jira] [Commented] (NETBEANS-58) NB IDE or NB Platform freeze on startup (proxy with Negotiate auth)
[
https://issues.apache.org/jira/browse/NETBEANS-58?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17053551#comment-17053551
]
Isaac commented on NETBEANS-58:
---
The [underlying OpenJDK bug|https://bugs.openjdk.java.net/browse/JDK-8068184]
has now closed with a fix version of Java 14. The fix has also been backported
to Java 8. Can those experiencing the issue update to a fixed version of JRE
and try again?
> NB IDE or NB Platform freeze on startup (proxy with Negotiate auth)
> ---
>
> Key: NETBEANS-58
> URL: https://issues.apache.org/jira/browse/NETBEANS-58
> Project: NetBeans
> Issue Type: Bug
> Components: platform - Proxy
>Affects Versions: 8.2, 9.0, 11.0
> Environment: Primarily Windows.
>Reporter: phansson
>Priority: Critical
> Attachments: NETBEANS-58-workaround1.diff,
> image-2018-04-24-15-57-47-592.png, nb-freeze-dump.txt, netbeans.txt
>
>
> When any network operation is performed, such as attempting to contact
> NetBeans Update Center, the application (IDE or Platform) may freeze. Users
> will typically experience this on startup. It was reported in old bug tracker
> as [bug 248308|https://netbeans.org/bugzilla/show_bug.cgi?id=248308].
> The problem arises because of the fix JDK folks applied as a consequence of
> the reported [JDK-8032832
> bug|https://bugs.openjdk.java.net/browse/JDK-8032832]. This fix wasn't very
> clever IMO: it puts a lock on the classloader, thus introducing a range of
> other problems, one of them being that NetNeans IDE or NetBeans Platform will
> likely freeze on startup when it attempts a network operation. The fact that
> their fix made things worse (while no doubt fixing the original issue) has
> been reported as
> [JDK-8068184|https://bugs.openjdk.java.net/browse/JDK-8068184].
> h3. WHEN DOES IT HAPPEN?
> As the lock is introduced for authentication of type 'Negotiate' it of course
> only happens if there's a network proxy on the path which uses this type of
> authentication. Also known as SPNEGO. This form of authentication is in my
> experience very common in corporate networks, in particular those that base
> themselves on the Microsoft stack. But a person on Oracle's own internal
> network, such as a JDK developer, is most likely not exposed to it. :-)
> There's another condition for it to happen: The JRE runtime must be unable to
> provide 'credentials' (a Kerberos token) to the network proxy on its own.
> SPNEGO is really designed to be seamless and promptless. Support for it was
> added in Java 6. But later on Microsoft tightened the desktop security around
> obtaining the so-called 'session token' and the JDK folks were never able to
> work around this (unlike the makers of Chrome, FF, Opera, etc). Therefore, in
> real-life, SPNEGO in the JRE on Windows is no longer promptless: it will be
> forced to ask the user for credentials, thus negating the idea of SPNEGO. It
> is the prompting which causes the freeze. SPNEGO on Mac OS X and Linux is
> most likely working just fine and the bug will never be experienced.
> h3. HOW DO I KNOW IF I'M AFFECTED BY EXACTLY THIS BUG?
> This bug in this ticket is characterized by the fact that you'll always be
> able to find the following in your thread dump:
> {noformat}
>at
> sun.net.www.protocol.http.NegotiateAuthentication.isSupported(NegotiateAuthentication.java:)
> - locked (a org.netbeans.ModuleManager$SystemClassLoader)
> {noformat}
> Note that the [Ctrl-Break
> method|https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr019.html]
> of obtaining a thread dump is favoured over jstack and other methods.
> h3. WHY DOES IT HAPPEN?
> There will be a lock held on the classloader object when the JRE's registered
> Authenticator is invoked. If the Authenticator does work on another thread,
> that other thread has a need for some classloading and the current thread
> needs to wait for the result of that thread, then bum!, there's a deadlock
> between the two threads. This means the lock on the classloader will never be
> released and it will ultimately affect other threads, such as the AWT
> dispatch thread (aka Swing EDT) which will then also lock. Then you have what
> the user experiences as a freeze.
> The NB Platform's own Authenticator, {{NbAuthenticator}}, does exactly what I
> described and will thus be triggering the deadlock. More precisely it will
> happen when NbAuthenticator calls Keyring. Does this mean the NbAuthenticator
> does something wrong? No, of course it doesn't. The real problem is the lock
> on the classloader. It is actually virtually impossible to design an
> Authenticator which doesn't trigger this problem. You cannot predict when
> classloading is needed. In fact it is very likely to be
