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Created attachment 1239043 [details]
proposed patch

Description of problem:
After solving https://bugzilla.redhat.com/show_bug.cgi?id=1399569 there remains the original issue where in case of flushOnTXEnd switch OFF omfile would upon reaching buffer size limit flush only buffer size thus leaving incomplete message in log file. Proposed patches solves this, also sent upstream (see linked GitHub issue)

Version-Release number of selected component (if applicable):
rsyslog-8.23.0-5.fc25.x86_64

How reproducible:
always

Steps to Reproduce:
1. put "local0.info action(type="omfile" file="/var/log/rsyslog.test.log" IOBufferSize="1k" FlushOnTXEnd="off")" into rsyslog.conf file
2. log enough messages with -p local0.info to reach buffer size
3. look at /var/log/rsyslog.test.log 

Actual results:
last flushed message is incomplete

Expected results:
all flushed messages are complete

Additional info:

I communicated with upstream that with this combination of switches the partial lines writing is actually intended behavior because of performance reasons, see https://github.com/rsyslog/rsyslog/pull/1353#issuecomment-271910634. Closing, if need from customer or somebody has other problems with this behavior, please reopen.