linux-ext4 - [Bug 203247] jbd2 gets stuck at jbd2_journal_commit

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Message-ID: <bug-203247-13602-ASgdb3Qi5s@https.bugzilla.kernel.org/>
Date:   Wed, 10 Apr 2019 18:21:54 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 203247] jbd2 gets stuck at jbd2_journal_commit_transaction
 frequently

https://bugzilla.kernel.org/show_bug.cgi?id=203247

--- Comment #8 from pkb07815 (pankajcabs@...il.com) ---
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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