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Date: Thu, 30 Jul 2015 07:01:32 +0800
From: Anand Jain <anand.jain@oracle.com>
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To: Anatol Pomozov <anatol.pomozov@gmail.com>, linux-btrfs@vger.kernel.org
Subject: Re: fs got readonly after "btrfs_run_delayed_refs:2783: errno=-5
 IO failure"
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Hi,

> I see a lot of checksum errors, but as I use RAID most of these error
> got fixed, I started scrub operation to find/fix all the problems but
> the scrub operation got cancelled at the very beginning. I see
> following error in kernel logs, it says "(device sdb):
> run_one_delayed_ref returned -5" and after that "(device sdb): forced
> readonly".

   are you using mount -o degrade option ? if not could you please try ?

Thanks, Anand