port-sgimips/53791: System lands in ddb due to CPU error when running lib/libc/gen/t_fpsetmask ATF test

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>Number:         53791
>Category:       port-sgimips
>Synopsis:       System lands in ddb due to CPU error when running lib/libc/gen/t_fpsetmask ATF test
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-sgimips-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 16 01:45:00 +0000 2018
>Originator:     Sevan Janiyan
>Release:        
>Organization:
>Environment:
NetBSD 8.99.27 sgimips mipseb
>Description:
lib/libc/gen/t_fpsetmask (136/760): 7 test cases
    fpsetmask_basic: [0.115081s] Passed.
    fpsetmask_masked_double: [0.111482s] Passed.
    fpsetmask_masked_float: [0.111522s] Passed.
    fpsetmask_masked_long_double: [0.111414s] Passed.
    fpsetmask_unmasked_double: pid 7183(t_fpsetmask): trap: cpu0, address error (load or I-fetch) in kernel mode
[ 5379.5860163] status=0x2000ff03, cause=0x10, epc=0x80430654, vaddr=0x4622012e
[ 5379.5860163] tf=0x80b85ce8 ksp=0x80b85d88 ra=0x800855fc ppl=0x7ddf9b7c
[ 5379.5860163] kernel: address error (load or I-fetch) trap
Stopped in pid 7183.1 (t_fpsetmask) at  netbsd:pcu_save+0x10:   lw      v0,4(v0)

db> bt
0x80b85d88: pcu_save+10 (80527cb0,46220002,2108,800861e8) ra 800855fc sz 0
0x80b85d88: mips_emul_fp+205c (80527cb0,80b85f60,3c,800861e8) ra 800694c0 sz 24
0x80b85da0: mips_fpu_intr+c8 (80527cb0,80b85f60,3c,800861e8) ra 8007a8e0 sz 24
0x80b85db8: trap+610 (80527cb0,1,3c,10fa0) ra 80071db8 sz 400
0x80b85f48: mips3_user_gen_exception+d8 (80527cb0,1,3c,10fa0) ra 0 sz 0
User-level: pid 7183.1
db> cont
panic: utlbmod: 0x4622012e: no pte
[ 5379.5860163] cpu0: Begin traceback...
[ 5379.5860163] pid -2135401792 not found
[ 5379.5860163] cpu0: End traceback...

[ 5379.5860163] dumping to dev 10,1 offset 147437

>How-To-Repeat:
Run the atf test suite on sgimips
>Fix: