HeroPudding opened a new issue, #625: URL: https://github.com/apache/mina-sshd/issues/625
### Version 2.10.0 ### Bug description I deployed a microservice on linux system ( arm ) and there is a timer task in this service, which will create sftp connection to fetch files from another node( one day one time. almost 14k files every time ). after this process running for almost 4 months, it occurs that the node CPU high alarm on the timer task running. and I checked the top -Hp result, the sshd-client single thread is occuping most CPU resources (30~40%), and due to several mina-sshd threads exsits, the CPU high reached 300% and more. after timer task finished, there's no sshd thread, the CPU back to slow. And which confused me that after I restart the service, the timer task won't cost such high CPU. Did anyone meet the similar case with me? ### Actual behavior here's the stack result (kill -3 pid) : "sshd-SshClient[70197f5]-nio2-thread-3" #20186890 daemon prio=5 os_prio=0 cpu=265.07ms elapsed=0.35s tid=0x0000aaaaf8ac1800 nid=0x2cb36 runnable [0x0000ffff78200000] java.lang.Thread.State: RUNNABLE at java.math.BigInteger.implMulAdd(BigInteger.java:3049) at java.math.BigInteger.mulAdd(BigInteger.java:3020) at java.math.BigInteger.implSquareToLen(BigInteger.java:2093) at java.math.BigInteger.squareToLen(BigInteger.java:2014) at java.math.BigInteger.implMontgomerySquare(BigInteger.java:2715) at java.math.BigInteger.montgomerySquare(BigInteger.java:2674) at java.math.BigInteger.oddModPow(BigInteger.java:2942) at java.math.BigInteger.modPow(BigInteger.java:2605) at org.bouncycastle.crypto.generators.DHKeyGeneratorHelper.calculatePublic(Unknown Source) at org.bouncycastle.crypto.generators.DHBasicKeyPairGenerator.generateKeyPair(Unknown Source) at org.bouncycastle.jcajce.provider.asymmetric.dh.KeyPairGeneratorSpi.generateKeyPair(Unknown Source) at org.apache.sshd.common.kex.DHG.calculateE(DHG.java:66) at org.apache.sshd.common.kex.AbstractDH.getE(AbstractDH.java:60) at org.apache.sshd.client.kex.DHGEXClient.next(DHGEXClient.java:177) at org.apache.sshd.common.session.helpers.AbstractSession.handleKexMessage(AbstractSession.java:772) at org.apache.sshd.common.session.helpers.AbstractSession.doHandleMessage(AbstractSession.java:632) at org.apache.sshd.common.session.helpers.AbstractSession.lambda$handleMessage$0(AbstractSession.java:556) at org.apache.sshd.common.session.helpers.AbstractSession$$Lambda$1102/1920761910.call(Unknown Source) at org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:68) at org.apache.sshd.common.session.helpers.AbstractSession.handleMessage(AbstractSession.java:555) at org.apache.sshd.common.session.helpers.AbstractSession.decode(AbstractSession.java:1701) at org.apache.sshd.common.session.helpers.AbstractSession.messageReceived(AbstractSession.java:516) - locked <0x000000008237a978> (a java.lang.Object) at org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:64) at org.apache.sshd.common.io.nio2.Nio2Session.handleReadCycleCompletion(Nio2Session.java:407) at org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:380) at org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:375) at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.lambda$completed$0(Nio2CompletionHandler.java:38) at org.apache.sshd.common.io.nio2.Nio2CompletionHandler$$Lambda$1090/1581151621.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:37) at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126) at sun.nio.ch.Invoker$2.run(Invoker.java:218) at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:750) top -Hp result: top - 02:23:32 up 130 days, 1:56, 1 user, load average: 13.50, 15.05, 12.79 Threads: 191 total, 4 running, 187 sleeping, 0 stopped, 0 zombie %Cpu(s): 80.1 us, 15.4 sy, 0.0 ni, 1.5 id, 0.7 wa, 0.7 hi, 1.5 si, 0.0 st MiB Mem : 59875.7 total, 1793.8 free, 28438.8 used, 29643.1 buff/cache MiB Swap: 32768.0 total, 28537.2 free, 4230.8 used. 31035.2 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 81023 ossuser 20 0 3178316 760084 8836 R 47.1 1.2 0:00.21 sshd-SshClient[ 80957 ossuser 20 0 3178316 760084 8836 R 29.4 1.2 0:00.28 sshd-SshClient[ 81051 ossuser 20 0 3178316 760084 8836 R 29.4 1.2 0:00.15 sshd-SshClient[ XXXXXX... ### Expected behavior how can I find why the CPU high ### Relevant log output _No response_ ### Other information _No response_ -- This is an automated message from the Apache Git Service. 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