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Date:   Wed, 19 Feb 2020 19:30:40 +0000
Subject: [Bug 206443] general protection fault in ext4 during simultaneous
 online resize and write operations

--- Comment #13 from Suraj ( ---
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
[3/3] ext4: fix potential race between s_flex_groups online resizing and access


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