Help me out here, folks: Is this harmless or not? On the one hand, if
it's just a matter of /etc/mtab claiming there's something mounted that
isn't, that seems (relatively) harmless. On the other hand, we have at
least one user reporting here (comment #9) that they see a significant
performance impact when this happens, and multiple users reporting that
it causes incorrect file system full errors (although I'm having trouble
seeing why it would do that).

So:

* Does this really have a performance impact, or is that user mistaken?

* Does this really cause false "full" errors, or are those users
mistaken?

10.04 is an LTS release. I'm seeing this on my fully-updated 10.04
server, which surprises me nearly two years later if it really has any
impacts.

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https://bugs.launchpad.net/bugs/499773

Title:
  Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears
  in /etc/mtab

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