halt and restart hang in "fuse exit"

[TomRoche]

After upgrading UP3->UP4 (i.e., upgrading to the 3.2 kernel) I'm noticing the following problem with one of my laptops. Previously, when I did either

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sudo shutdown -Ph now

or

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sudo shutdown -r now

the box would either halt or restart as expected. Now, the box will exit from X to single-user (going to character-mode with white text on black screen), print a bunch of messages (more here about that), and then hang with something like

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[50881.951125] fuse exit

where it will remain until I Alt-SysRq-[REISUB].

Note the same box is also having an odd problem involving USB mounts: dunno if that is related.

How to fix or debug?

[äxl]

You propably know this: http://en.wikipedia.org/wiki/Filesystem_in_Userspace
Maybe this is related: https://bugzilla.redhat.com/show_bug.cgi?id=493565