Re: 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.)

Steven Cole
2004-05-18T00:46:31Z

On Monday 17 May 2004 06:13 pm, Andrew Morton wrote:
> Steven Cole <elenstev@mesatop.com> wrote:
> >
> > >
> > OK, applied your one-liner above with PREEMPT.
> >
> > ...
> > Found null start 0xfb259a end 0xfb3000 len 0xa66 line 478846
> >
> > The above was on reiserfs and happened on the very first pull.
> >
> > Attaching the source of saga.c for reference.
>
> ok, thanks.
>
> > So, what next doc?  Back out that one-liner and try your vmtruncate?
>
> No, it won't help in that case.
>
> > Or try Chris' patch for reiserfs?
> >
> > At the moment I'm testing on ext3, which survived the two pull/unpulls.
> > This is like watching paint dry.
> >
> > I'll do some more bk unpull and bk pull cycles until this breaks on ext3.
>
> I guess it would be interesting to run it on a filesystem which has 2k or
> even 1k blocksize. If the corruption then terminates on a 2k- or
> 1k-boundary then that will rule out a few culprits.
>
> I'd really like to see this happen on some other machine though. It'd be
> funny if you have a dud disk drive or something.
>
>
I have a backup disk as /dev/hdb, which is usually not mounted.

[root@spc steven]# df -T
Filesystem Type Size Used Avail Use% Mounted on
/dev/hda6 ext3 293M 88M 190M 32% /
/dev/hda9 reiserfs 26G 8.3G 18G 32% /home
/dev/hda1 ntfs 3.0G 2.4G 651M 79% /mnt/win_c
/dev/hda5 vfat 3.0G 811M 2.2G 27% /mnt/win_d
/dev/hda7 ext3 3.9G 2.1G 1.7G 56% /usr
/dev/hda8 ext3 491M 69M 397M 15% /var
/dev/hdb1 reiserfs 299M 180M 119M 61% /home/steven/red
/dev/hdb6 reiserfs 3.9G 1.8G 2.2G 46% /home/steven/blue
/dev/hdb7 reiserfs 299M 175M 124M 59% /home/steven/green
/dev/hdb8 reiserfs 197M 38M 159M 19% /home/steven/yellow
/dev/hdb9 reiserfs 12G 5.4G 5.8G 48% /home/steven/purple

I could possibly reformat /dev/hdb6 (3.9G) for testing later.
Let me know the details on what would be most meaningfull.

The ext3 fs (/usr) has survived four cycles of
bk pull bk://linux.bkbits.net/linux-2.5
bk unpull -fq

Steven