[Bug 3177] sshd process had became into a defunct process and could not accept requests any more after many count sftp accesses.

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3177

--- Comment #6 from longgang <zhlonggang at aliyun.com> ---
Darren Tucker, I have run the test on last weekend. The following is
the test result.

1. The openssh-8.3p1 complied with or without NO_SA_RESTART flags
defined, both had run into the problem as openssh-8.2p1. After a few
hours later, the java client program failed with the following
exception:

"Session.connect: java.net.SocketTimeoutException: Read timed out". 

The sshd process became into defunct status.

[root at bjm7-9-10 ~]# ps -ef|grep sshd
root      1118     1  0  2019 ?        00:02:24 /usr/sbin/sshd
root     14170 16380  0 16:28 ?        00:00:00 [sshd] <defunct>
root     16380     1  0 08:57 ?        00:00:26 sshd:
/usr/local/openssh-8.3p1/sbin/sshd -p 99 -f
/etc/ssh/sshd_config_sftp.bad [listener] 0 of 10-100 startups


2. I also have run the openssh-8.1p1, the sshd process was normal and
did not become into defunct status, but the java client program  failed
occasionally with the following exeption:

"java.io.IOException: inputstream is closed".

If the java client program catch the exception and ignore the error, it
will success next time.

3.  My test with openssh-7.9p1 has already run 3 days so far,
everything is also ok, the problem also do not occur, and the java
client program has no errors as openssh-8.1p1.

I seems like openssh-7.9p1 is my best choice.

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