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Bug#648155: linux-image-3.xx nfs4 mount hangs when kerberos ticket expires. Squeeze used give EPERM

On 11/09/2011 08:44 AM, John Hughes wrote:
> This is a kernel bug not a nfs-common bug.
> Using the squeeze kernel (2.6.32-5) in place of the current unstable
> kernel what happens is that attempts to access the nfs4 mounted system
> get an EPERM instead of hanging and no horrid messages are written to
> the log.

I can confirm that i'm seeing this bug in 2.6.39 (from backports.org) as
well.  It's particularly bad because if two users are connected to the
kerberized mount, and the ticket of one of them expires, access for
*both* users ends up hanging this way.

Interesting that it's not present in 2.6.32; i haven't been able to test
that because 2.6.32 doesn't support any modern encryption types for
krb5, and the domain i'm administering is restricted to modern
encryption types.

I'd be happy to set up test systems to debug this, including trying
kernel patches if anyone can suggest something worth trying.


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