High system CPU usage when contending futex

[mosoriob]

High system CPU usage when the disk server is running. However, it is sleeping

Here are the syscall running by the process. You can see the process is stuck in the futex syscall

 sudo strace -p 365731
[sudo] password for mosorio: 
strace: Process 365731 attached
futex(0x7f43241d0910, FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, 365736, NULL, FUTEX_BITSET_MATCH_ANY

And it is using 100% CPU. Here, it is the CPU usage of the Java process.

➜  ~ pidstat 1 | grep 365731
06:06:34 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:35 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:36 PM  1000    365731  101.00    0.00    0.00    0.00  101.00     5  java
06:06:37 PM  1000    365731   98.00    1.00    0.00    0.00   99.00     5  java
06:06:38 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:39 PM  1000    365731  101.00    0.00    0.00    0.00  101.00     5  java
06:06:40 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:41 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:42 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:43 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:44 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:45 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:46 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:47 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:48 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:49 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:50 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:51 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:52 PM  1000    365731  101.00    0.00    0.00    0.00  101.00     5  java
06:06:53 PM  1000    365731   99.00    0.00    0.00    0.00   99.00     5  java
06:06:54 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:55 PM  1000    365731  101.00    0.00    0.00    0.00  101.00     5  java
06:06:56 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:57 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:58 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:06:59 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:00 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:01 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:02 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:03 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:04 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:05 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:06 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:07 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:08 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:09 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:10 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:11 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:12 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:13 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:14 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:15 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:16 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:17 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:18 PM  1000    365731   99.01    0.00    0.00    0.00   99.01     5  java
06:07:19 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:20 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:21 PM  1000    365731  101.00    0.00    0.00    0.00  101.00     5  java
06:07:22 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:23 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:24 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:25 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:26 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:27 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java
06:07:28 PM  1000    365731  100.00    0.00    0.00    0.00  100.00     5  java

[mosoriob]

Environment

Linux pop-os 5.17.5-76051705-generic #202204271406165150484022.04~63e51bd SMP PREEMPT Mon May 2 15: x86_64 x86_64 x86_64 GNU/Linux

openjdk version "1.8.0_312"
tomcat 7.0

[mosoriob]

https://discuss.lightbend.com/t/java-play-2-7-processes-stuck-at-100-cpu-on-linux-server/3711/3