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Date: Tue, 18 Sep 2007 12:27:57 +1000
Subject: Re: Bug Report
From: "Barry Naujok" <bnaujok@sgi.com>
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To: Mark Goodall <mark.goodall@gmail.com>, xfs@oss.sgi.com

On Fri, 07 Sep 2007 03:05:29 +1000, Mark Goodall <mark.goodall@gmail.com>  
wrote:

> Not sure what caused this bug, how much more information do you need?
>
>         - 18:01:15: check for inodes claiming duplicate blocks - 198528  
> of
> 198528 inodes done
> No modify flag set, skipping phase 5
> Phase 6 - check inode connectivity...
>         - traversing filesystem starting at / ...
> corrupt dinode 25809974, extent total = 16, nblocks = 0.  This is a bug.
> Please report it to xfs@oss.sgi.com.
> cache_node_purge: refcount was 1, not zero (node=0x8d65fd0)
> couldn't map inode 25809974, err = 117
> entry "gobo_3.3-6_i386.deb" in shortform directory inode 1770978822  
> points
> to free inode 1770978825
> would junk entry "gobo_3.3-6_i386.deb"
>         - 18:01:48: traversing filesystem - 32 of 32 allocation groups  
> done
>         - traversal finished ...
>         - traversing all unattached subtrees ...
> Segmentation fault (core dumped)
>
> OS: Ubuntu Linux mserve 2.6.20-16-386 #2 Fri Aug 31 00:51:58 UTC 2007  
> i686
> GNU/Linux
> fully patched from official repositories

Latest xfsprogs 2.9.4 doesn't segfault anymore in Phase 6.

The "corrupt dinode..." error is a symptom of running
xfs_repair in -n mode where Phase 3 would have fixed the
offending inode up:

-n mode:
   bad attribute format 0 in inode 25809974, would reset value
   bad anextents 16 for inode 25809974, would reset to 0

repair mode:
   bad attribute format 0 in inode 25809974, resetting value
   correcting anextents for inode 25809974, was 16 - counted 0

Regards,
Barry.