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Date:   Wed, 19 Feb 2020 19:30:40 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 206443] general protection fault in ext4 during simultaneous
 online resize and write operations

https://bugzilla.kernel.org/show_bug.cgi?id=206443

--- Comment #13 from Suraj (surajjs@...zon.com) ---
Your approach using call_rcu is very similar to something I was also exploring
so that looks good to me.

Apologies, I didn't realise that patches attached to the BZ had to be mailing
list ready.

There is also the same issue present with the resizing of the s_group_info and
s_flex_groups arrays which are addressed in the following patches which I have
posted to the EXT4 mailing list:
[1/3] ext4: introduce macro sbi_array_rcu_deref() to access rcu protected
fields [1]
[2/3] ext4: fix potential race between s_group_info online resizing and access
[2]
[3/3] ext4: fix potential race between s_flex_groups online resizing and access
[3]

[1] http://patchwork.ozlabs.org/patch/1240507/
[2] http://patchwork.ozlabs.org/patch/1240506/
[3] http://patchwork.ozlabs.org/patch/1240509/

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