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port-arm/54445: evbarm crash

>Number:         54445
>Category:       port-arm
>Synopsis:       evbarm crash
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-arm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Aug 08 11:05:00 +0000 2019
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.4
The NetBSD Foundation, Inc.
System: NetBSD 7.2_STABLE NetBSD 7.2_STABLE (PLUG) #25: Thu May 30 10:44:40 CEST 2019 evbarm
(but kernel of -current from yesterday)

Architecture: earm
Machine: evbarm

I have this GuruPlug machine that won't run netbsd-8 due to mvsata issues.
So I tried a -current 9.99.4 kernel as of yesterday (mostly a SHEEVAPLUG
kernel) and tested it. No SATA problems this time (good!) but after some
time it randomly ... "stopped", not even paniced:

NetBSD/evbarm ( (console)

login: Stopped in pid 0.5 (system) at  c2b8c460:       strheq  r0, [r0], -r0
db> bt
0xcbc7f49c: c021a9b0
0xcbc7f4ac: c000c8ec
0xcbc7f4d4: c0072010
0xcbc7f544: c0072408
0xcbc7f5bc: c000bb6c
0xcbc7f5dc: c0087434
0xcbc7f5fc: c00872c4
0xcbc7f64c: c008ae48
0xcbc7f684: c008b2e4
0xcbc7f6e4: c008b624
0xcbc7f734: c008ae54
0xcbc7f76c: c008b2e4
0xcbc7f7cc: c008b624
0xcbc7f81c: c008ae54
0xcbc7f854: c008b2e4
0xcbc7f8b4: c008b624
0xcbc7f904: c008ae54
0xcbc7f93c: c008b2e4
0xcbc7f99c: c008b624
0xcbc7f9ec: c008ae54
0xcbc7fa24: c008b2e4
0xcbc7fa84: c008b624
db> sh reg
spsr        40000013
r0          0
r1          0
r2          0
r3          1014
r4          218
r5          cbc80218
r6          cbc80000
r7          0
r8          2
r9          0
r10         1
r11         cbc7f49c
r12         cbc7f470
usr_sp      bfffe590
usr_lr      75608
svc_sp      cbc7f470
svc_lr      c021aa24
pc          c2b8c460
und_sp      c0433000
abt_sp      c0430000
irq_sp      c0432000
db> mach fault
DFAR=0x4 DFSR=0x17 IFAR=0 IFSR=0x17
db> mach frame cbc7f470
frame address = cbc7f470  spsr=cbc7f49c
r0 =c022adf0 r1 =c00733a4 r2 =c2b86708 r3 =c03f04c0
r4 =00000000 r5 =00000001 r6 =cbc7f4ac r7 =cbc7f4a0
r8 =c000c8ec r9 =c021a9b0 r10=cbc7f4d4 r11=cbc7f4b0
r12=c0072010 r13=c000c8ec r14=c03f04c0 r15=c03f04c0
slr=c03f04b8 ssp=00000000



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