Thousands of "lookupdotdot failed" messages - should I be worried?

A Dog DragonFly at
Tue Jun 15 17:00:15 PDT 2021

On Tue, Jun 15, 2021 at 03:25:12PM MDT, A Dog wrote:
> Lately I've been seeing this message repeated over and over again in my
> dmesg (I use HAMMER1, in case that isn't obvious from the message):
> Jun 15 14:05:22 badpuppy kernel: lookupdotdot failed 2 dvp 0xfffff800e95c7080
> Jun 15 14:05:25 badpuppy last message repeated 285 times
> (The address seems to vary somewhat, but that one seems to be the most
> common of the values it's been taking.)
> Should I be worried about losing data?  Is there anything I can do to
> diagnose what the problem might be?
> -- 
> A Dog

Update: I found this ancient bug report:

I am indeed exporting PFS's (through null mounts), which is the only way 
to export filesystems that were originally mirrored from somewhere else 
as the root PFS cannot be slaved.  (FWIW, these are now operating as 
masters.)  From a quick look at the client side, it seems that these are 
correlated with I/O errors.

Is this PFS irreversibly borked?  If so, is there something I can do to 
prevent other PFS's from suffering the same fate...?

A Dog

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