Root FS corruption

[Yar Tikhiy]

Hi all,

I saw the following / corruption in a fresh CURRENT when using
nextboot.  Of course, it wasn't the fault of nextboot itself,
nextboot simply was the only utility to modify / in my case.

I found the contents of nextboot.conf once in my custom /root/supfile,
the other time in the stock /etc/protocols.  /etc/protocols was
large enough to see how the corruption had happened: the first
fragment, 2048 bytes, of the file was replaced by the contents of
nextboot.conf, zero padded.

The / was a usual 2048/16384 UFS2 without soft-updates.  The kernel
was GENERIC.  Forced fsck reported no problems at all.  The / had
never been dirty because I used nextboot to boot single-user with
all FSen read-only and investigate a panic unrelated to FS.

Did any one see a similar problem of fragment mis-allocation?

-- 
Yar