Eugene Petrenko created SSHD-754:
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Summary: OOM in sending data for channel
Key: SSHD-754
URL: https://issues.apache.org/jira/browse/SSHD-754
Project: MINA SSHD
Issue Type: Bug
Affects Versions: 1.1.0
Reporter: Eugene Petrenko
I have an implementation of SSHD server with the library. It sends gigabytes
(e.g. 5GB) of data as command output.
Starting from Putty plink 0.68 (also includes plink 0.69) we started to have
OOM errors. Checking memory dumps shown the most of the memory is consumed from
the function
org.apache.sshd.common.session.AbstractSession#writePacket(org.apache.sshd.common.util.buffer.Buffer)
In the hprof I see thousands of PendingWriteFuture objects (btw, each holds a
reference to a logger instance). And those objects are only created from this
function.
It is clear the session is running through rekey. I see the kexState indicating
the progress.
Is there a way to artificially limit the sending queue, no matter if related
remote window allows sending that enormous amount of data? As of my estimation,
the window was reported to be around 1.5 GB or more. Maybe, such huge window
size was caused by an arithmetic overflow that is fixed on SSHD-701
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