bin/111146: fsck fails on 6Tfilesystem

[Dan D Niles]

The following reply was made to PR bin/111146; it has been noted by GNATS.

From: Dan D Niles <dan at more.net>
To: bug-followup at FreeBSD.org
Cc: Harrison Grundy <astrodog at gmail.com>, Jan Srzednicki <w at wrzask.pl>
Subject: Re: bin/111146: fsck fails on 6Tfilesystem
Date: Mon, 16 Apr 2007 14:08:57 -0500

 I attached the failed raid device to a newer server with 8G of RAM.  I
 booted to an amd64 kernel, and set datasize limit to 7G. 
 
 Resource limits (current):
   cputime          infinity secs
   filesize         infinity kB
   datasize          7340032 kB
   stacksize-cur        8192 kB
   coredumpsize     infinity kB
   memoryuse-cur     8093236 kB
   memorylocked-cur  1299644 kB
   maxprocesses         6164
   openfiles           12328
   sbsize           infinity bytes
   vmemoryuse       infinity kB
 
 
 Now when I run fsck I get:
 
 ** /dev/da0
 ** Last Mounted on /LSO
 ** Phase 1 - Check Blocks and Sizes
 fsck_ffs: bad inode number 53321728 to nextinode
 
 My theory is that some bits got flipped in the meta-data and
 cg_initediblk is getting a bad value.  The value of 1,572,191,256 that
 it returns just before it fails is greater than the total number of
 inodes, which is around 784,218,256.
 
 It is distressing that some bits in the meta-data could get flipped
 during normal usage resulting in an unusable filesystem.
 
 I have 19 hours before I need to reformat the array and put it back into
 production.  Is there anything else I should try before then?
 
 Thanks,
 
 Dan