Re: xfs revival

[Dave Chinner <david@fromorbit.com>]

On Sat, May 28, 2011 at 09:16:17AM -0500, James Grossmann wrote:
> On Sat, May 28, 2011 at 12:12 AM, James Grossmann <cctsurf@gmail.com> wrote:
> > I recently decided to build a raid10 on my server.  sadly shortly
> > after I built it, a pair of the drives (mirroring each other) dropped
> > errors at the same time, but upon a little revival are both actively
> > working.  I resynced the raid, but now I'm having difficulties
> > reviving my xfs file system.
> > I'm running ubuntu server 11.04, which includes xfsprogs 3.1.4.
> > I have been attempting to get the git version or even 3.1.5 working on
> > my system because I continue to get errors in attempting to xfs_repair
> > the volume, but they don't seem to want to build for me.  I kept
> > getting a hang on inode 2111, but with some searching found the
> > command: sudo xfs_repair -P -o bhash=1024 /dev/md0 to get me to inode
> > 538638356.  However, it fails at that point with the following
> > message:
> > corrupt dinode 538638356, extent total = 1, nblocks = 0.  This is a bug.
> > Please capture the filesystem metadata with xfs_metadump and
> > report it to xfs@oss.sgi.com.
> > cache_node_purge: refcount was 1, not zero (node=0x3412410)
> >
> > fatal error -- 117 - couldn't iget disconnected inode

Ok, not much to go on there.

> >
> > When I attempt the referenced command, it fails on me with the
> > following error, I have attached the file it produces in dumping.
> > udo xfs_metadump /dev/md/OlIronsides\:0 Olironsides.xfs.metadump
> > cache_node_purge: refcount was 1, not zero (node=0x20b2420)
> > xfs_metadump: cannot read root inode (117)
> > cache_node_purge: refcount was 1, not zero (node=0x20b6020)
> > xfs_metadump: cannot read realtime bitmap inode (117)
> > *** glibc detected *** xfs_db: free(): invalid next size (normal):
> > 0x00000000020d6000 ***

That doesn't tell us much because the binaries are stripped.
Building and using an unstripped binary shoul dgive a much more
informative backtrace.

....

> I was able to install the ubuntu Oneiric Ocelot's version of xfsprogs
> (3.1.5), but I still get the same error at the same place.
> Following the user guide, I was able to read inode 538638356:
> 
> sudo xfs_db -c "inode 538638356" -c "print" /dev/md/OlIronsides\:0
> cache_node_purge: refcount was 1, not zero (node=0x2062420)
> xfs_db: cannot read root inode (117)
> cache_node_purge: refcount was 1, not zero (node=0x2066020)
> xfs_db: cannot read realtime bitmap inode (117)
> core.magic = 0x494e
> core.mode = 0100755
> core.version = 2
> core.format = 2 (extents)
> core.nlinkv2 = 1
> core.onlink = 0
> core.projid_lo = 0
> core.projid_hi = 0
> core.uid = 1000
> core.gid = 100
> core.flushiter = 3
> core.atime.sec = Wed May 25 22:44:12 2011
> core.atime.nsec = 569449438
> core.mtime.sec = Sat Dec 12 13:55:26 2009
> core.mtime.nsec = 000000000
> core.ctime.sec = Thu May 26 16:14:51 2011
> core.ctime.nsec = 201400000
> core.size = 5035163
> core.nblocks = 1230
  ^^^^^^^^^^^^^^^^^^^
> core.extsize = 0
> core.nextents = 1
> core.naextents = 0
> core.forkoff = 0
> core.aformat = 2 (extents)
> core.dmevmask = 0
> core.dmstate = 0
> core.newrtbm = 0
> core.prealloc = 0
> core.realtime = 0
> core.immutable = 0
> core.append = 0
> core.sync = 0
> core.noatime = 0
> core.nodump = 0
> core.rtinherit = 0
> core.projinherit = 0
> core.nosymlinks = 0
> core.extsz = 0
> core.extszinherit = 0
> core.nodefrag = 0
> core.filestream = 0
> core.gen = 2106989417
> next_unlinked = null
> u.bmx[0] = [startoff,startblock,blockcount,extentflag] 0:[0,386750464,1230,0]

so that looks like it has an extent and data blocks, so something
has happened during the repair to zero block count of the in-memory
version of the inode. That implies that the extent might be bad and
was cleared earlier in the repair process, but without the repair
output there i sno way to tell.

> I'm having problems building the git xfsprogs, I get the following
> error when I run make, I'm guessing I just don't have something
> installed for the build.

Have you pulled in all the automake, autoconf, etc packages? You
caould also try running 'make realclean' first, too.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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