ran into rare bug: "unable to verify superblock, continuing..."

["Errikos Pitsos {secure}" <ep@xxxxxxxxxx>]

Hi!

Seems like I ran into a known problem wrt to "unable to verify 
superblock, continuing..."
http://oss.sgi.com/projects/xfs/faq.html#xfsmountfail

I can't mount the xfs fs.
I can't repair the xfs fs.
Yes, this is my root partition, this is a new system I was setting up.
I don't know what caused the trouble, but it seems that somehow the 
system was not properly unmounted.
Using xfs_repai without "L" doesn't change anything.
So if I can help finding that bug tell me.
I am using Gentoo and had a 2.4.24-xfs-r3 on there, syslog says:
Mar 10 07:56:43 leonzwei SGI XFS snapshot-2.4.23-2003-12-01_00:33_UTC 
with no debug enabled

For some reason it seems that the XFS was not cleanly unmounted, not 
sure though. The system was cleanly shutdown, but I didn't find a:
 Mar 10 03:47:25 leonzwei Ending clean XFS mount for filesystem: ide1(22,3)

in there which I had before.


syslog shows these here when I try to mount the partition.
Mar 10 08:03:37 leonzwei XFS: bad magic number
Mar 10 08:03:37 leonzwei XFS: SB validate failed



here some console output:

leonzwei root # xfs_repair -nLv /dev/hdc3
Phase 1 - find and verify superblock...
bad primary superblock - bad magic number !!!

attempting to find secondary superblock...
........................................................................................................... 


.....................found candidate secondary superblock...
error reading superblock 54 -- seek to offset 57982058496 failed
unable to verify superblock, continuing...
........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


.............................................................found 
candidate secondary superblock...
error reading superblock 54 -- seek to offset 57982058496 failed
unable to verify superblock, continuing...
........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


........................................................................................................... 


.............................................................found 
candidate secondary superblock...
error reading superblock 54 -- seek to offset 57982058496 failed
unable to verify superblock, continuing...


goes on for ever.

here something else that I saw that you requested from somebody who had 
the same bug:

leonzwei root # xfs_db /dev/hdc3
xfs_db: unexpected XFS SB magic number 0x1917d8b3
xfs_db: sb 0
xfs_db: p
magicnum = 0x1917d8b3
blocksize = 689553475
dblocks = 12180848741608851668
rblocks = 8457844901802481315
rextents = 17089333805017595916
uuid = c005688d-587d-e4b5-7729-c2cd4e81e350
logstart = 12437974581420056107
rootino = 2035592538136216092
rbmino = 2311019282328682982
rsumino = 940638864488651459
rextsize = 4062341194
agblocks = 1795335310
agcount = 3583083788
rbmblocks = 745776455
logblocks = 2344638215
versionnum = 0xcd77
sectsize = 57419
inodesize = 22122
inopblock = 22912
fname = "q\275\347\017o;\202\376<l\243I"
blocklog = 253
sectlog = 155
inodelog = 111
inopblog = 173
agblklog = 91
rextslog = 155
inprogress = 45
imax_pct = 183
icount = 3536497887666359542
ifree = 15647017454152257949
fdblocks = 15766340045555572059
frextents = 7127039695291382717
uquotino = 7880036713507589276
gquotino = 3559299706880429710
qflags = 0x5d07
flags = 0xe9
shared_vn = 152
inoalignmt = 237542219
unit = 2706140452
width = 574901660
dirblklog = 54
logsectlog = 60
logsectsize = 49029
logsunit = 1105637059
xfs_db:


anything else I can provide bug hunters with?

erik