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port-mips/51288: reproducable panic on evbmips64-eb (erlite)

>Number:         51288
>Category:       port-mips
>Synopsis:       reproducable panic on evbmips64-eb (erlite)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-mips-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jun 27 19:15:00 +0000 2016
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.32
The NetBSD Foundation, Inc.
System: NetBSD 7.99.32 NetBSD 7.99.32 (ERLITE) #141: Mon Jun 27 16:12:45 CEST 2016 evbmips
Architecture: mips64eb
Machine: evbmips

On a gcc 5.4 compiled ERLITE I can reproducably panic the machine:

$ cd /usr/tests/lib/libc/sys
$ atf-run t_mmap 

trap: cpu0, address error (load or I-fetch) in kernel mode
status=0x800083, cause=0x10, epc=0xffffffff8022fb54, vaddr=0xdeaddeaddeaddeb5
tf=0x980000041097b210 ksp=0x980000041097b350 ra=0xffffffff8022fb1c ppl=0x90000000
kernel: address error (load or I-fetch) trap
Stopped in pid 867.1 (t_mmap) at        netbsd:pmap_enter_pv+0xcc:      ld      v
at          ffffffffffffffc0
v0          0
v1          fffffffffffff000
a0          800081
a1          6   _KERNEL_OPT_AIO+0x5
a2          18  _KERNEL_OPT_AIO+0x17
a3          ffffffff80552c10    cpu_info_store
a4          0
a5          3   _KERNEL_OPT_AIO+0x2
a6          0
a7          ffffffffffffffff
t0          ffffffff805d7740    pmap_pvlist_mutex
t1          1   _KERNEL_OPT_AIO
t2          ffffffff80552c10    cpu_info_store
t3          0
s0          deaddeaddeaddead
s1          ffffffff80553180    kernel_pmap_store
s2          c00000000e38c000
s3          9000000001496c80
s4          0
s5          ffffffff805d0000    db_symtab+0x6e418
s6          980000041097b3b0
s7          ffffffff80550000    ostype+0x9ff48
t8          980000000fe3ca20
t9          ffffffff80234950    syscall
k0          0
k1          1   _KERNEL_OPT_AIO
gp          ffffffff805de370    inet4_reserve+0x1350
sp          980000041097b350
fp          ffffffff80550000    ostype+0x9ff48
ra          ffffffff8022fb1c    pmap_enter_pv+0x94
sr          800083
mdlo        6666666668000000
mdhi        6666666
bad         0
cs          10  _KERNEL_OPT_AIO+0xf
pc          ffffffff8022fb54    pmap_enter_pv+0xcc
netbsd:pmap_enter_pv+0xcc:      ld      v0,8(s0)
db> bt
0x980000041097b350: pmap_enter_pv+cc (800081,6,18,ffffffff80552c10) ra ffffffff8
0230b74 sz 96
0x980000041097b3b0: pmap_enter+304 (800081,6,18,ffffffff80552c10) ra ffffffff803
49c24 sz 112
0x980000041097b420: ubc_fault+334 (800081,6,18,ffffffff80552c10) ra ffffffff804b
0000 sz 176
0x980000041097b4d0: version+60 (800081,6,18,ffffffff80552c10) ra 0 sz 0
User-level: pid 867.1



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