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https://issues.apache.org/jira/browse/SSHD-1191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17378102#comment-17378102
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Thomas Wolf commented on SSHD-1191:
-----------------------------------
This KEX failure is caused by the chacha20-poly1305 cipher from SSHD-1017 being
used in the KEX. If that cipher is removed, the test runs perfectly fine.
See the attached {{sftptest_debug_log.txt}} for debug output during a run using
chacha20.
> SftpTransferTest sometimes hangs (failure during rekeying)
> ----------------------------------------------------------
>
> Key: SSHD-1191
> URL: https://issues.apache.org/jira/browse/SSHD-1191
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Thomas Wolf
> Priority: Major
> Labels: test-stability
> Attachments: sftptest_debug_log.txt, sftptest_hang.txt,
> sftptest_hang_nio_log.txt, sftptest_hang_nio_stack.txt
>
>
> Mentioned in [PR 176|https://github.com/apache/mina-sshd/pull/176]:
> {{SftpTransferTest}} hangs sometimes.
> Observed this myself; got the hang once with NIO and once with mina.
> Attached is a jstack dump taking during the hang (from the mina run).
> Apache MINA sshd master; OS X 10.14.6, Java 1.8: Oracle Hotspot jdk1.8.0_191.
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