[SSHD-1028] SSH_MSG_DISCONNECT: 12 "Too many concurrent connections (64) - max. allowed: 64"

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.0
• Fix Version/s: 2.6.0
• Environment: bazel test //javatests/com/google/gerrit/acceptance/git:SshPushForReviewIT
• Assignee: Guillaume Nodet
• Reporter: David Ostrovsky
• Created: 01/Jul/20 22:16
• Updated: 29/Dec/20 08:01
• Resolved: 22/Jul/20 07:33

Description

I'm trying to migrate Gerrit to 2.5.0 and seeing this exception:

80) pushCommitsWithSameTreeNoChanges(com.google.gerrit.acceptance.git.SshPushForReviewIT)
com.jcraft.jsch.JSchException: SSH_MSG_DISCONNECT: 12 Too many concurrent connections (64) - max. allowed: 64 
	at com.jcraft.jsch.Session.read(Session.java:1004)
	at com.jcraft.jsch.UserAuthPublicKey.start(UserAuthPublicKey.java:198)
	at com.jcraft.jsch.Session.connect(Session.java:470)
	at com.jcraft.jsch.Session.connect(Session.java:183)
	at com.google.gerrit.acceptance.SshSession.getSession(SshSession.java:111)
	at com.google.gerrit.acceptance.SshSession.open(SshSession.java:46)
	at com.google.gerrit.acceptance.AbstractDaemonTest.initSsh(AbstractDaemonTest.java:541)
	at com.google.gerrit.acceptance.AbstractDaemonTest.beforeTest(AbstractDaemonTest.java:456)
	at com.google.gerrit.acceptance.AbstractDaemonTest$1$1.evaluate(AbstractDaemonTest.java:230)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at com.google.testing.junit.runner.internal.junit4.CancellableRequestFactory$CancellableRunner.run(CancellableRequestFactory.java:108)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
	at com.google.testing.junit.runner.junit4.JUnit4Runner.run(JUnit4Runner.java:116)
	at com.google.testing.junit.runner.BazelTestRunner.runTestsInSuite(BazelTestRunner.java:159)
	at com.google.testing.junit.runner.BazelTestRunner.main(BazelTestRunner.java:85)

Reproducer is here: [1].

[1] https://gerrit-review.googlesource.com/c/gerrit/+/274055

Issue Links

• is duplicated by: SSHD-1115 after client send FIN message, server failed excute close, leads to server under CLOSE_WAIT status