Hmm, I've got a suspicion it might be this:
commit c297c8b99b07f496ff69a719cfb8e8fe852832ed
Author: Andy Adamson <[email protected]>
Date: Wed Nov 20 13:00:17 2013 -0500
SUNRPC: do not fail gss proc NULL calls with EACCES
I'm not familiar with this code at all, but I do see a possibility for
the state machine being processed in rpc_async_schedule() to get into an
infinite loop if gss_refresh_null() returns 0 and RPCAUTH_CRED_UPTODATE
is not set. That commit changes the function from returning -EACCESS to
returning 0, and I'm thinking maybe it should also be setting
RPCAUTH_CRED_UPTODATE.
You guys are welcome to continue the bisect, but if you want I can build
a kernel with that commit reverted to see if we can short-circuit the
process. If it is this commit then I _think_ the fix is trivial. Let me
know.
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https://bugs.launchpad.net/bugs/1282302
Title:
deadlock when unmounting nfs shares in trusty
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