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Date:   Wed, 7 Jul 2021 21:42:25 +0300
From:   Ivan Zahariev <>
Subject: jbd2: fix deadlock while checkpoint thread waits commit thread to
 finish (backport to 4.14)


We're running Linux kernel 4.14.x and our systems occasionally suffer a 
bug which is already fixed:

This bugfix hasn't been ported to Linux kernels 4.14 or 4.19. The patch 
applies cleanly. The two files "fs/jbd2/checkpoint.c" and 
"fs/jbd2/journal.c" seem pretty identical in the affected sections 
compared to kernel 5.4 where we have this bugfix already applied.

Is it on purpose that this bugfix hasn't been ported to 4.14? Is it safe 
that we backport it manually in our kernel 4.14 builds? Or is the "ext4" 
system in 4.14 and 5.4 fundamentally different and this would lead to 
data loss or other problems?

Thank you.

Best regards.

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