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Date:   Wed, 10 Apr 2019 18:21:54 +0000
Subject: [Bug 203247] jbd2 gets stuck at jbd2_journal_commit_transaction

--- Comment #8 from pkb07815 ( ---
issue is reproducible:

I have use dd command to generate file in /data area to compete with the
postgres operation and using iostat -x to monitor the io condition.

Here is how I create the dd with variation of count value and sleep time:
for i in {1..100}; do nice -n 10 dd if=/dev/zero
of=/data/tmp/testonly/tmpfile$i.txt count=1024 bs=1048576; echo "done tmpfile
$i"; sleep 10; done &

I use postgresql utility pgbench paired with other in-house sql commands for
test of transactions: 
su -s /bin/bash postgres -c "/usr/postgresql/bin/pgbench -T 90000 -c 8 bench2"

When I execute the pgbench and dd both..I see the processes going into D state
and stuck there for long (atleast for 140 seconds).

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