linux-kernel - Re: bio linked list corruption.

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Message-ID: <20161021202325.q6uh7k2pgnv276rg@codemonkey.org.uk>
Date:   Fri, 21 Oct 2016 16:23:25 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Chris Mason <clm@...com>
Cc:     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>,
        Josef Bacik <jbacik@...com>, 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 04:17:48PM -0400, Chris Mason wrote:

 > > BTRFS warning (device sda3): csum failed ino 130654 off 0 csum 2566472073 expected csum 3008371513
 > > BTRFS warning (device sda3): csum failed ino 131057 off 4096 csum 3563910319 expected csum 738595262
 > > BTRFS warning (device sda3): csum failed ino 131176 off 4096 csum 1344477721 expected csum 441864825
 > > BTRFS warning (device sda3): csum failed ino 131241 off 245760 csum 3576232181 expected csum 2566472073
 > > BTRFS warning (device sda3): csum failed ino 131429 off 0 csum 1494450239 expected csum 2646577722
 > > BTRFS warning (device sda3): csum failed ino 131471 off 0 csum 3949539320 expected csum 3828807800
 > > BTRFS warning (device sda3): csum failed ino 131471 off 4096 csum 3475108475 expected csum 2566472073
 > > BTRFS warning (device sda3): csum failed ino 131471 off 958464 csum 142982740 expected csum 2566472073
 > > BTRFS warning (device sda3): csum failed ino 131471 off 0 csum 3949539320 expected csum 3828807800
 > > BTRFS warning (device sda3): csum failed ino 131532 off 270336 csum 3138898528 expected csum 2566472073
 > > BTRFS warning (device sda3): csum failed ino 131532 off 1249280 csum 2169165042 expected csum 2566472073
 > > BTRFS warning (device sda3): csum failed ino 131649 off 16384 csum 2914965650 expected csum 1425742005
 > >
 > >
 > > A curious thing: the expected csum 2566472073 turns up a number of times for different inodes, and gets
 > > differing actual csums each time.  I suppose this could be something like a block of all zeros in multiple files,
 > > but it struck me as surprising.
 > >
 > > btrfs people: is there an easy way to map those inodes to a filename ? I'm betting those are the
 > > test files that trinity generates. If so, it might point to a race somewhere.
 > 
 > btrfs inspect inode 130654 mntpoint

Interesting, they all return

ERROR: ino paths ioctl: No such file or directory

So these files got deleted perhaps ?

	Dave