Stefan says "While in the case we test, the request is seen as success
but then the authentication flavours do not match and the client does an
explicit umount request (probably the same happens when the
authentication methods are supported but the authentication fails)."

I spent a lot of time staring at this yesterday myself. The umount
doesn't do much: it doesn't involve any local state manipulation. I also
chased the aliases for the filehandle and such on the mount, and I
didn't see any leaks of the pointer to something that might manipulate
it after it gets freed (which happens in all the failing mount cases).

However, if repeated mounts fail, it is odd that the original
manifestation of this bug is that a *single* chase through the symlink
is sufficient to produce an (eventual) crash. I wonder if a single
failing mount is really sufficient to produce a crash. That would be
odd, because you'd think that would happen a lot.

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https://bugs.launchpad.net/bugs/683938

Title:
  kernel crash on symlink chased from NFS to failing automount

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