[Bug 299031] installation may create partition missing superblock

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299031

--- Comment #2 from Jin Guojun <jguojun@gmail.com> ---
(In reply to John Baldwin from comment #1)
Generally, the installation went well.
however, when booting the newly installed system, process will stop at mounting
rest partitions. Root partition "/" can be mounted, but partitions after it
will fail.
dumpfs will not find superblock on xxxs1d, and fsck_ufs -b
possible_alternative_blocks will not find a superblock anywhere.

Additional information of disk management failure during the installation:
Since bsdinstall does not have an option of formatting partition after 10-R
release, to install new FreeBSD on existing FreeBSD drive, existing partitions
must be deleted and recreated. During revising the partition process, deleting
command may fail sometime.

 deleting all partitions

 creating slices and partitions on a 1.5TB disk drive
=> s1       64GB
       s1a
       s1b
       s1d
   s2        32GB
       ...
   s3        128GB
      s3a
      s3b
   s4        should have more than 1TB space, but bsdinstall show only 757GB
      s4a
      s4d

tried to delete s3{a,b} and s4[a,b} then recreate partitions with different
sizes, deleting process complains partition is busy. The installation has to be
aborted and rebooted.

Because these failure messages cannot be logged, only way to show the error
message is take a photo on the screen. Folks on the question-mail-list give me
a couple of public posting site, but they seem not working from Unix machines,
so I cannot post there and provide a URL.
If you can have some way to exchange images, I can share the screen shot for
the failure messages.

The superblock issue should be easy to reproduce, install the minimum
distribution (do not configure the networking) and it takes less than 10
minutes.

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