------- Comment From [email protected] 2015-10-31 17:59 EDT-------
It looks like a non-zero return from do_execve() in ____call_usermodehelper() 
is the primary trigger here.

if (!retval)
return 0;
do_exit(0);

A successful callout bypasses the do_exit() process accounting.  While
trying to debug the nfsidmap utility, I typoed a path and the resulting
callout returned 127.  My test system locked up just like the
customer's.

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https://bugs.launchpad.net/bugs/1509120

Title:
  Process accounting deadlock with idmapd callout when writing to NFSv4
  mount

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