crash in NFSv4 automount code - Red Hat Customer Portal

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Issue

Every time a user logs in, there's a kernel panic.
The home directory layout is NFSv4 with each user's dir bind mounted from a separate export.
RHEL 6.1 and 6.2 work fine.
RHEL 6.3 does not crash, however ssh rsa logins fail until the user (as root) cats a file (seemingly any file) from their home directory, after which ssh rsa logins succeed.
An strace sshd shows the open() of the users authorized_keys file failing with EACCES in the first case, and succeeding in the second.
RHEL 6.4 operates identically to 6.3, except that instead of EACCES you get a panic.

Environment

Red Hat Enterprise Linux 6 Update 4
kernel 2.6.32-358

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