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Date:   Thu, 17 Jan 2019 10:32:16 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 201631] WARNING: CPU: 11 PID: 29593 at fs/ext4/inode.c:3927
 .ext4_set_page_dirty+0x70/0xb0

https://bugzilla.kernel.org/show_bug.cgi?id=201631

--- Comment #43 from Jan Kara (jack@...e.cz) ---
Thanks for gathering the results and sorry for not replying earlier. I've been
busy with other work... So again I can see in the logs:

Clean page (index 137, ino 1820427, i_size 1144448, flags 3ffe0000002016) with
dirty PTE (pte_val c0000005f899f186) on unmap!
WARNING: CPU: 3 PID: 1532 at fs/ext4/inode.c:3935
.ext4_set_page_dirty+0x80/0x170
...
page 137: b_state 21, b_blocknr 2726281, b_mapped 0, b_cleaned 1498120697108,
now 1498125595648

So the page has been submitted for writeout some 5 ms ago but still we didn't
get b_mapped set at all which would mean that ext4_page_mkwrite() got never
called for the page - which is very weird. I'll ponder more about it possibly
come up with more debugging.

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