Replicable file-system corruption due to fsck/ufs

[Peter Holm]

On Fri, Apr 12, 2019 at 04:13:00PM -0700, Kirk McKusick wrote:
> > Peter Holm <peter at holm.cc> wrote:
> > 
> >> I see this even with a single truncate on HEAD.
> >>
> >> $ ./truncate10.sh
> >> 96 -rw-r--r--  1 root  wheel  1073741824 11 apr. 06:33 test
> >> ** /dev/md10a
> >> ** Last Mounted on /mnt
> >> ** Phase 1 - Check Blocks and Sizes
> >> INODE 3: FILE SIZE 1073741824 BEYOND END OF ALLOCATED FILE, SIZE SHOULD BE 268435456
> >> ADJUST? yes
> > 
> > Thanks.. I should have tested that myself.. doh! I was trying to
> > closer replicate my real file that triggered the problem which
> > contained a number of sparse areas.
> > 
> > And thanks for adding Kirk to the discussion. I wanted to first be
> > sure it wasn't just me :-)
> > 
> > Cheers, Jamie
> 
> This is indeed a bug in the calculation of the location of the last
> block of a file. I believe that the following patch to head will
> fix it.
> 
> Peter, can you please test and let me know.
> 
> If Peter confirms that it fixes the bug, I will check it into head
> and MFC it to 12-stable and 11-stable after a 2-week settle-in time.
> 
> 	Kirk McKusick
> 

Yes, this patch works for me.

-- 
Peter