OutOfMemoryError: unable to create new native thread in Hybris 6.7

[rdunna-eprosoft]

I'm working on Hybris 6.7 with system configuration of 8 CPU cores and 32GB RAM.

Following are the local.properties configured for "DCEVM-8u181-installer-build2.jar", "hotswap-agent-1.3.0.jar" and java version "1.8.0_211"

java.mem=6G
tomcat.maxthreads=200
tomcat.acceptcount=100
tomcat.debugjavaoptions=-Xms6g -Xmx6g -Xss256k -XXaltjvm=dcevm -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,address=8000,suspend=n -javaagent:/DCEVM/hotswap-agent-1.3.0.jar=autoHotswap=true,disablePlugin=Log4j2,disablePlugin=Spring,disablePlugin=Proxy,disablePlugin=AnonymousClassPatch,disablePlugin=ZK
tomcat.generaloptions=-Xmx6G ...

Hotswap stops working after I do ant build in any extension

Exception in thread "Thread-3" java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:717)
at org.hotswap.agent.command.impl.SchedulerImpl.executeCommand(SchedulerImpl.java:119)
at org.hotswap.agent.command.impl.SchedulerImpl.processCommands(SchedulerImpl.java:92)
at org.hotswap.agent.command.impl.SchedulerImpl.access$100(SchedulerImpl.java:21)
at org.hotswap.agent.command.impl.SchedulerImpl$2.run(SchedulerImpl.java:128)
...

More Info:

ulimit -a

core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 128561
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) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 4096
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

cat /proc/sys/kernel/threads-max

257122

java -XX:+PrintFlagsFinal -version | grep ThreadStackSize

intx CompilerThreadStackSize = 0 {pd product}
intx ThreadStackSize = 1024 {pd product}
intx VMThreadStackSize = 1024 {pd product}

sysctl -a | grep kernel.pid_max

kernel.pid_max = 32768