[issue1598] undo hangs

[Alexander Polakov (via DragonFly issue tracker)]

Alexander Polakov <polachok at gmail.com> added the comment:

> If someone would like a little mini project, just add a stat() or fstat()
> call in the undo code and don't try to open() files that aren't regular
> files.  Plus generate a warning to stderr for that transaction id.

Ran into this bug today myself. Do you mean something like this [1]? I don't like 
phrasing though.
[1] fetch http://leaf.dragonflybsd.org/~polachok/undo-patch-1.diff

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