Surprising atf test failure

[Paul Goyette <paul%whooppee.com@localhost>]

My most recent amd64 test run failed with the following panic (in the 
qemu emulated environment):


lib/libc/sys/t_stat (246/589): 8 test cases
    stat_chflags: [0.122160s] Passed.
    stat_dir: [0.941391s] Passed.
    stat_err: [0.064735s] Passed.
    stat_mtime: [6.234184s] Passed.
    stat_perm: [0.122550s] Passed.
    stat_size: [0.125169s] Passed.
    stat_socket: panic: kernel diagnostic assertion "(inp != NULL) ^ 
(in6p != NULL)" failed: file "/test-bed/src/sys/netinet/tcp_usrreq.c", line 254
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
kern_assert() at netbsd:kern_assert+0x4f
tcp_usrreq_wrapper() at netbsd:tcp_usrreq_wrapper+0x93c
soo_stat() at netbsd:soo_stat+0x98
do_sys_fstat() at netbsd:do_sys_fstat+0x23
sys___fstat50() at netbsd:sys___fstat50+0x1d
syscall() at netbsd:syscall+0x9a
--- syscall (number 440) ---
7f7ff710bf0a:
cpu0: End traceback...





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