[Linux-kernel-mentees] [PATCH] fs: btrfs: block-group.c: Fix suspicious RCU usage warning

David Sterba dsterba at suse.cz
Fri Mar 6 19:37:13 UTC 2020


On Fri, Mar 06, 2020 at 12:22:43PM +0530, madhuparnabhowmik10 at gmail.com wrote:
> From: Madhuparna Bhowmik <madhuparnabhowmik10 at gmail.com>
> 
> The space_info list is rcu protected.
> Hence, it should be traversed with rcu_read_lock held.
> 
> Warning:
> [   29.104591] =============================
> [   29.104756] WARNING: suspicious RCU usage
> [   29.105046] 5.6.0-rc4-next-20200305 #1 Not tainted
> [   29.105231] -----------------------------
> [   29.105401] fs/btrfs/block-group.c:2011 RCU-list traversed in non-reader section!!
> 
> Reported-by: Guenter Roeck <linux at roeck-us.net>
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10 at gmail.com>

I've updated the changelog based on comments from the mail thread and
applied the patch. Thanks.


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