OpenJDK OOM issue -

[David Holmes]

Hi Tim,

On 19/09/2017 6:50 PM, Yu, Tim (NSB - CN/Chengdu) wrote:
> Hi OpenJDK dev group

This is better discussed on hotspot-dev, so redirecting there.

> We meet one issue that the VM failed to initialize. The error log is as below. We checked both memory usage and thread number. They do not hit the limit. So could you please help to confirm why "java.lang.OutOfMemoryError: unable to create new native thread" error occurs? Many thanks.

Unfortunately there is no way to tell. As you indicate there appears to 
be enough memory, and there appear to be enough threads/processes 
available for creation.

Does this happen regularly or was this a one-of failure? You really need 
to see the exact state of the machine at the time this happened.

David

> "
> on Sep 18 11:05:04 EEST 2017 2 or first INFO log missing: Error occurred during initialization of VM
> java.lang.OutOfMemoryError: unable to create new native thread
> Error occurred during initialization of VM
> java.lang.OutOfMemoryError: unable to create new native thread
> 
> 1.      Memory Usage
> MemFree:          898332 kB
>  From below core file generated during OMM, it can be seen about 900M physical memory available during that time.
> 
> 
> 2 Thread number
> 
> sh-4.1$ ps -eLf|wc -l
> 5326
> 
> 
> sh-4.1$ ulimit -a
> core file size          (blocks, -c) 0
> data seg size           (kbytes, -d) unlimited
> scheduling priority             (-e) 0
> file size               (blocks, -f) unlimited
> pending signals                 (-i) 43497
> max locked memory       (kbytes, -l) 64
> max memory size         (kbytes, -m) unlimited
> open files                      (-n) 1024
> pipe size            (512 bytes, -p) 8
> POSIX message queues     (bytes, -q) 819200
> real-time priority              (-r) 0
> stack size              (kbytes, -s) 10240
> cpu time               (seconds, -t) unlimited
> max user processes              (-u) 43497
> virtual memory          (kbytes, -v) unlimited
> file locks                      (-x) unlimited
> 
> Br,
> Tim
> 
> 
> 
>