Re: 3.15.1: kernel BUG at fs/btrfs/locking.c:269

[Liu Bo <bo.li.liu@oracle.com>]

On Thu, Jul 03, 2014 at 06:44:21AM -0700, Marc MERLIN wrote:
> Thanks for the patch. Hopefully this will make it to the next 3.15.x
> kernel.
> 
> I also went back to 3.14 anyway since the 'blocked for 120 seconds' look
> like another instance of deadlocks we've been discussing here.
> 
> But just curious:
> 
> > >>[160562.925463] parent transid verify failed on 2776298520576 wanted 41015 found 18120
> 
> What should I be doing about this?
> Does it mean that I do have some kind of corruption/damage on my
> filesystem?
> 

If there is another copy for the block(RAID1, DUP, RAID5/6), it'd try to read
the copy and repair the crc with the good one, it's all we can do about it.

> Also, is it possible to have all these messages state which devid they
> occurred on? I don't even know which device I should be worrying about
> right now, and although I'm running scrub now, my understanding is that
> scrub doesn't actually look at FS structures and is likely to miss this
> anyway.

Yes we can but it'd need a bit more effort, for now, all device msg we've seen
in panic info comes from sb->s_id which points to @fs_info->latest_device.

thanks,
-liubo

> 
> Thanks,
> Marc
> -- 
> "A mouse is a device used to point at the xterm you want to type in" - A.S.R.
> Microsoft is to operating systems ....
>                                       .... what McDonalds is to gourmet cooking
> Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901