On Tue, May 7, 2013 at 3:20 PM, Eric Sandeen <sandeen@xxxxxxxxxxx> wrote:
I still got back around 6TB out of 7.2 TB of total data stored, so this tells xfs is reliable even when major faults occur...On 5/7/13 4:27 AM, Filippo Stenico wrote:
> Hello,
> this is a start-over to try hard to recover some more data out of my raid5 - lvm - xfs toasted volume.Ho hum, well, no segfault this time, just an out of memory error?
> My goal is either to try the best to get some more data out of the volume, and see if I can reproduce the segfault.
> I compiled xfsprogs 3.1.9 from deb-source. I ran a xfs_metarestore to put original metadata on the cloned raid volume i had zeroed the log on before via xfs_repair -L (i figured none of the actual data was modified before as I am just working on metadata.. right?).
> Then I ran a mount, checked a dir that I knew it was corrupted, unmount and try an xfs_repair (commands.txt attached for details)
> I went home to sleep, but at morning I found out that kernel paniced due "out of memory and no killable process".
> I ran repair without -P... Should I try now disabling inode prefetch?
> Attached are also output of "free" and "top" at time of panic, as well as the output of xfs_repair and strace attached to it. Dont think gdb symbols would help here....
>
>
That's right....
No real way to know where it went from the available data I think.
A few things:
> root@ws1000:~# mount /dev/mapper/vg0-lv0 /raid0/data/
> mount: Structure needs cleaning
mount failed? Now's the time to look at dmesg to see why.
>From attached logs it seems to be:
> XFS internal error xlog_valid_rec_header(1) at line 3466 of file [...2.6.32...]/fs/xfs/xfs_log_recover.c
> XFS: log mount/recovery failed: error 117
> root@ws1000:~# mount
<no raid0 mounted>
> root@ws1000:~# mount /dev/mapper/vg0-lv0 /raid0/data/
> root@ws1000:~# mount | grep raid0
> /dev/mapper/vg0-lv0 on /raid0/data type xfs (rw,relatime,attr2,noquota)
Uh, now it worked, with no other steps in between? That's a little odd.
Looks odd to me too. But i just copied the commands issued as they where on my console... so yes, nothing in between.
It found a clean log this time:
> XFS mounting filesystem dm-1
> Ending clean XFS mount for filesystem: dm-1
which is unexpected.
So the memory consumption might be a bug but there's not enough info to go on here.
worth reporting, but I'm not sure what we can do with it.
> PS. Let me know if you wish reports like this one on list.
Your storage is in pretty bad shape, and xfs_repair can't make something out
of nothing.
-Eric
Thanks anyways, I am trying with a "-L" repair, at this step I expect another fail (due out of memory or something, as it happened last time) then I will try with "xfs_repair -L -vv -P" and I expect to see that segfault again.
Will report next steps, maybe something interesting for you will pop up... for me is not a waste of time, since this last try is worth being made.
--
F
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