sysinstall creates corrupt filesystems after repartitioning

Steven Hartland killing at
Fri Mar 2 17:02:46 UTC 2007

Jeremy Chadwick wrote:
> Pardon my ignorance, but can you give me a step-by-step on how to
> reproduce this?  I have a couple VMware FreeBSD sessions up and
> want to see if I can reproduce it there.  I also have an actual
> FreeBSD testbox at home which I can format and reinstall.
> (I'm not denying the problem exists, I just want to reproduce it,
> and I think those steps would be useful to those who can fix the
> problem too.)

No problem if you have the resources / time to test this now
thats great.

Here's the steps I used, if you have any questions just shout:
1. Boot a normal 6.2 install
2. dump /usr to remote location
3. restore said dump to a empty directory on the remote machine
4. share this directory over nfs to the test machine
5. edit /etc/fstab to use the nfs /usr instead of the ufs /usr
6. reboot
7. Enable mbr changes on live fs: sysctl kern.geom.debugflags=16
8. run sysinstall
8.1 delete /dev/(da|ad)0s1f ( the /usr partition )
8.2 create a smaller /usr in the space cleared
8.3 create /data with the remaining space
8.4 Write the changes
9. quit sysinstall
10. umount -f /usr ( to restore the nfs version )
11. umount /data
12. fsck /dev/(da|ad)0s1(f|g) both will be corrupt.


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