linux-kernel - Re: bio linked list corruption.

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Message-ID: <20161021211102.emoxdpfr635ujtxb@codemonkey.org.uk>
Date:   Fri, 21 Oct 2016 17:11:02 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Josef Bacik <jbacik@...com>
Cc:     Chris Mason <clm@...com>, Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...com>, Al Viro <viro@...iv.linux.org.uk>,
        David Sterba <dsterba@...e.com>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: bio linked list corruption.

On Fri, Oct 21, 2016 at 04:41:09PM -0400, Josef Bacik wrote:

 > >>  >
 > >>  > btrfs inspect inode 130654 mntpoint
 > >>
 > >> Interesting, they all return
 > >>
 > >> ERROR: ino paths ioctl: No such file or directory
 > >>
 > >> So these files got deleted perhaps ?
 > >>
 > > Yeah, they must have.
 > >
 > 
 > So one thing that will cause spurious csum errors is if you do things like 
 > change the memory while it is in flight during O_DIRECT.  Does trinity do that? 
 > If so then that would explain it.  If not we should probably dig into it.  Thanks,

Yeah, that's definitely possible. And it wasn't that long ago I added
some code to always open testfiles multiple times with different modes,
so the likely of O_DIRECT went up. That would explain why I've started
seeing this more.

	Dave