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Re: Suddenly, a dead filesystem



On Tue, Aug 23, 2011 at 03:27:27PM +0100, Hugo Mills wrote:
> On Tue, Aug 23, 2011 at 05:15:46PM +0300, Avi Kivity wrote:
> > I've been using btrfs for a while as my /home (converted from ext4;
> > encrypted lvm) when it died on me.  Mounting it crashes immediately,
> > here's a log:
> [...]
> > [    6.456117] Call Trace:
> > [    6.456117]  [<ffffffffa005646e>] add_inode_ref+0x2e6/0x37c [btrfs]
> > [    6.456117]  [<ffffffffa00493f6>] ? read_extent_buffer+0xc3/0xe3 [btrfs]
> > [    6.456117]  [<ffffffffa0056e14>] replay_one_buffer+0x197/0x212 [btrfs]
> > [    6.456117]  [<ffffffffa0054e94>] walk_down_log_tree+0x15a/0x2c1 [btrfs]
> > [    6.456117]  [<ffffffffa005507a>] walk_log_tree+0x7f/0x19e [btrfs]
> > [    6.456117]  [<ffffffff8123a8d9>] ? radix_tree_lookup+0xb/0xd
> > [    6.456117]  [<ffffffffa0058148>] btrfs_recover_log_trees+0x28b/0x298 [btrfs]
> > [    6.456117]  [<ffffffffa0056c7d>] ? replay_one_dir_item+0xbd/0xbd [btrfs]
> > [    6.456117]  [<ffffffffa002a192>] open_ctree+0x10f1/0x13ff [btrfs]
> [...]
> > Tried btrfsck, immediate segfault.
> 
>    Yes, it does that,I'm afraid. (It also doesn't fix anything).
> 
> > Both kernel and btrfsprogs are stock Fedora 15.  I still have the
> > logical volume and would like to recover it.  Its fairly easy to try
> > out things in a virtual machine, so if you have a patch you want me to
> > try out, I'm here.
> 
>    It looks like you've got a corrupt log tree. The quick and easy fix
> for that is on the wiki in the problem FAQ page [1].

   ... or use Josef's fix first. :)

   H.

>    Could you give a bit more information about what happened in the
> crash immediately prior to the FS being unmountable, and how your
> storage is configured?
> 
>    Hugo.
> 
> [1] https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#I_can.27t_mount_my_filesystem.2C_and_I_get_a_kernel_oops.21
> 

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
   --- You stay in the theatre because you're afraid of having no ---    
                         money? There's irony...                         

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