[Bug 208691] "panic: ffs_valloc: dup alloc" as soon as UFS root partition is mounted

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208691

--- Comment #6 from Kirk McKusick <mckusick at FreeBSD.org> ---
You suggest ``An alternative to prevent the observed behaviour, of rebooting
continually, would be to always fully fsck the filesystem when it is dirty,
rather than the current fsck -p behaviour of replaying the journal and applying
simpler checks.''

To get this behavior, turn off journalling using the command:

      tunefs -j disable /filesystem/to/disable

When the system finds a clean filesystem at boot, it skips fsck. When the
system finds a dirty filesystem at boot and no journal, it runs a full fsck.

You note ``I'm not sure a new "filesystem panic flag" would help, as there's
not a lot of difference between the state the FS can be left in after to a
kernel panic and when it stops due to a power failure.''

When a panic occurs, the filesystem code never gets another chance to run, thus
there is no way for it to set a `filesystem panic'ed flag'. The only indication
of something unexpected having happened is the absence of a `filesystem cleanly
unmounted flag'.

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