[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

Kirk McKusick <mckusick at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
         Resolution|---                         |Not A Bug

--- Comment #4 from Kirk McKusick <mckusick at FreeBSD.org> ---
I am closing this bug as it is triggered by disks running in an unreliable
mode. As such there is no change called for in the software, though one can
legitimately argue that the default should be to configure disks to run with
`write cache disabled' so that they will be reliable. FreeBSD ran for a while
with this default, but for many disks the performance was abysmal, so the
default reverted back to unreliable. Most disks support tag queuing today which
does not suffer poor performance from `write cache disabled', so perhaps it is
time to revisit this default. But that is not a topic for this report.

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