[issue1972] panic: lockmgr: locking against myself - live dedup

["Thomas Nikolajsen \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Thomas Nikolajsen <thomas.nikolajsen@mail.dk> added the comment:

Is it our permanent solution to use enable vfs.hammer.double_buffer
when vfs.hammer.live_dedup is enabled?

Discussion on IRC the other day seemed to indicate this.

If this is the case, we could include it in the code.

And I could document it in hammer.5,
also the description of vfs.hammer.double_buffer sounded
interesting, especially regarding always doing CRC check.

 -thomas

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