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* nick/ssh/fix-process-leak/OTP-8807:
Fix race condition when terminating a connection.
fix process leak in ssh_system_sup (dynamicaly created childs where not cleaned up)
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This was caused by a race condition between two processes.
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cleaned up)
The ssh_system_sup supervisor supervises one ssh_subsystem_sup process for
every client connection. There was no functionality to free resources
(terminate_child/ delete_child) when a client connection was closed.
Which lead to one ssh_subsystem_sup and one ssh_channel_sup process left over.
This commit adds ssh_system_sup:stop_subsystem/2 and code that calls it
in ssh_connection_manager:terminate/2.
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OTP-8735 SSH in some cases generated a crash report when a channel
was closed in a normal way.
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OTP-8714 SSH in some cases terminated channels with reason normal
when it should have been shutdown.
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OTP-8550 The function ssh:connect/4 was not exported.
OTP-8644 Aligned error message with used version (SSH_FX_FAILURE
vs SSH_FX_NOT_A_DIRECTORY, the latter introduced in version
6).
OTP-8645 Resolved race condition when another connection is started
before a channel is opened in the first connection.
OTP-8535 The configuration parameter ip_v6_disabled is now available,
which makes it possible for the user to alter the IP version
SSH shall use.
OTP-8534 The ssh_connection:send operation now accepts infinity as
timeout.
OTP-8524 The connection handler now include stack traces when a channel
message is not handled correctly.
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