port-arm/56463: armv4 kernel/t_lock tests locks up machine

[martin%NetBSD.org@localhost]

>Number:         56463
>Category:       port-arm
>Synopsis:       armv4 kernel/t_lock tests locks up machine
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-arm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 24 10:30:01 +0000 2021
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.92
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-rest.duskware.de 9.99.92 NetBSD 9.99.92 (GENERIC) #11: Sat Oct 23 12:21:03 CEST 2021 martin%martins.aprisoft.de@localhost:/usr/src/sys/arch/shark/compile/GENERIC shark
Architecture: earmv4
Machine: shark
>Description:

Running the kernel/t_lock test on armv4  immediately locks up the
machine, can't ^C the test, console is dead. Ddb works, but is not very
helpfull:

Stopped in pid 14205.14205 (t_lock) at  netbsd:cpu_Debugger+0x4:        mov     
pc, r14
db> ps
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
14205>14205 7   0         0           f1c09500             t_lock
678    678 3   0       180           f1715880               tail kqueue
1556  1556 3   0       180           f17b08c0               tcsh pause
1205  1205 3   0       180           f17155c0               sshd select
1059  1059 3   0       180           f13bccc0               sshd poll
1047  1047 3   0       180           f13bca00                tee pipe_rd
936    936 3   0       180           f1495a80         atf-report pipe_rd
1131  1131 3   0       180           f1424a40                tee pipe_rd
1133  1133 3   0       180           f1424200            atf-run poll
956    956 3   0       180           f13bc740                 sh wait
234    234 3   0       180           f13bc480                 sh wait
955    955 3   0       180           f13a6440              getty ttyraw
915    915 3   0       180           f17b0080               cron nanoslp
849    849 3   0       180           f1715b40              inetd kqueue
830    830 3   0       180           f1715300               sshd select
750    750 3   0       180           f1715040               ntpd pause
489    489 3   0       180           f14957c0            rpcbind poll
374    374 3   0       180           f1495500            syslogd kqueue
313    313 3   0       180           f1424d00             dhcpcd poll
277    277 3   0       180           f1495240             dhcpcd poll
280    280 3   0       180           f1424780             dhcpcd poll
1        1 3   0       180           f13a6180               init wait
0     17775 5   0       200           f1b39c00           (zombie)
0       82 3   0       200           f13a6700            physiod physiod
0       96 3   0       200           f13bc1c0          pooldrain pooldrain
0       56 3   0       200           f13a6c80            ioflush syncer
0       55 3   0       200           f13a69c0           pgdaemon pgdaemon
0       51 3   0       200           f1303c40            rt_free rt_free
0       50 3   0       200           f1303980              unpgc unpgc
0       49 3   0       200           f1302100    icmp6_wqinput/0 icmp6_wqinput
0       31 3   0       200           f13023c0          nd6_timer nd6_timer
0       30 3   0       200           f1302680    carp6_wqinput/0 carp6_wqinput
0       29 3   0       200           f1302940     carp_wqinput/0 carp_wqinput
0       28 3   0       200           f1302c00     icmp_wqinput/0 icmp_wqinput
0       27 3   0       200           f1303140           rt_timer rt_timer
0       26 3   0       200           f1303400        vmem_rehash vmem_rehash
0       25 3   0       200           f13036c0          entbutler entropy
0       16 3   0       240           f12dcbc0            atabus0 atath
0       15 3   0       200           f12dc900               iic0 iicintr
0       14 3   0       200           f12dc640         pmfsuspend pmfsuspend
0       13 3   0       200           f12dc380           pmfevent pmfevent
0       12 3   0       200           f12dc0c0         sopendfree sopendfr
0       11 3   0       200           f120fb80            iflnkst iflnkst
0       10 3   0       200           f120f8c0           nfssilly nfssilly
0        9 3   0       240           f120f600             vdrain vdrain
0        8 3   0       240           f120f340          modunload mod_unld
0        7 3   0       200           f120f080            xcall/0 xcall
0        6 1   0       200           f120db40          softser/0
0        5 1   0     40200           f120d880          softclk/0
0        4 1   0     40200           f120d5c0          softbio/0
0        3 1   0     40200           f120d300          softnet/0
0        2 1   0       201           f120d040             idle/0
0        0 3   0       200           f039e1c0            swapper uvm
db> trace/a f1c09500
trace: pid 14205 lid 14205 at 0xf6eaaea4
0xf6eaaea4: f6eaaeb0
Bad frame pointer: 0xf023e2e8


>How-To-Repeat:

cd /usr/tests/kernel && atf-run t_lock

>Fix:
n/a