free(): corrupted unsorted chunks

[Thomas Stüfe]

Hi Oliver,

Is there a stack trace on stderr?

Thanks, Thomas





On Thu, Jun 21, 2018 at 1:59 PM, Oliver Kohll <oliver at agilechilli.com> wrote:
> Hi,
>
> I'm a Java developer getting a crash and error message 'free(): corrupted
> unsorted chunks' in the log. this sounds like it could be a low level issue
> in the core Java libraries so I'm posting here, but if it would be better
> in another list (or even a different community) please let me know.
>
> So I'm requesting help because I don't know how to debug this further. In
> summary, the issue is
>
> We're getting a crash nearly once a day on our production system, at a time
> of day when it's most busy (mid morning). This crash hasn't been seen on
> our development environment, which is the same apart from the server has
> less memory and CPU resources.
>
> The environment is:
> * A VPS host
> * Ubuntu LTS 18 (Bionic)
> * The default Java 10 packaged as 11 I believe (
> https://askubuntu.com/questions/1037646/why-is-openjdk-10-packaged-as-openjdk-11
> )
> * However, javac seems to be from JDK8:
> root at server:~# file /etc/alternatives/java /etc/alternatives/javac
> /etc/alternatives/java:  symbolic link to
> /usr/lib/jvm/java-11-openjdk-amd64/bin/java
> /etc/alternatives/javac: symbolic link to
> /usr/lib/jvm/java-8-openjdk-amd64/bin/javac
>
> We're running our webapp on Tomcat 8 (also the Ubuntu default). When this
> happens, the server stops responding to HTTP requests (in fact the java
> process has quit) and needs to be restarted.
>
> The crash doesn't seem to correspond to a particular activity on the server
> as far as I can see, though it's hard to tell as many people are logged in
> at the same time.
>
> Does anyone have any pointers of
> a) how to track the bug further so I can report it, ideally without a big
> impact on our live server
> b) more immediately, any workarounds to try
>
> In the meantime I will see if I can downgrade to JDK8 on the test server,
> but I'm not sure if that's possible or whether it would make a difference.
>
> Regards
> Oliver