port-alpha/56306: kernel/t_fpufork:fpufork fails under qemu-system-alpha, passes on AXPpci33

[thorpej%me.com@localhost]

>Number:         56306
>Category:       port-alpha
>Synopsis:       kernel/t_fpufork:fpufork fails under qemu-system-alpha, passes on AXPpci33
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-alpha-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 12 17:30:00 +0000 2021
>Originator:     Jason Thorpe
>Release:        9.99.86
>Organization:
RISCy Business
>Environment:
NetBSD alpha-vm 9.99.86 NetBSD 9.99.86 (GENERIC-$Revision: 1.412 $) #157: Sun Jul 11 18:29:37 PDT 2021  thorpej@the-ripe-vessel:/space/src/sys/arch/alpha/compile/GENERIC.QEMU alpha
>Description:
alpha-vm:thorpej 23$ ./t_fpufork fpufork
t_fpufork: WARNING: Running test cases without atf-run(1) is unsupported
t_fpufork: WARNING: No isolation nor timeout control is being applied; you may get unexpected failures; see atf-test-case(4)
Executing command [ /usr/tests/kernel/./h_fpufork ]
Fail: incorrect exit status: 1, expected: 0
stdout:

stderr:

failed: atf-check failed; see the output of the test for details
alpha-vm:thorpej 24$ 

axppci33$ atf-run t_fpufork | atf-report                                       
Tests root: /usr/tests/kernel

t_fpufork (1/1): 1 test cases
    fpufork: [4.541993s] Passed.
[4.614029s]

Summary for 1 test programs:
    1 passed test cases.
    0 failed test cases.
    0 expected failed test cases.
    0 skipped test cases.
axppci33$
>How-To-Repeat:
See above.
>Fix:
N/A