A native armv7 panic during kyua runs: sys/netinet6/exthdr:exthdr -> Fatal kernel mode data abort: 'Alignment Fault' on read

From: Mark Millard <marklmi_at_yahoo.com>
Date: Fri, 04 Aug 2023 06:59:32 UTC
While discovered via an attempted overall kyua run, the following is
sufficient to get the crash in my native armv7 context:

# /usr/bin/kyua test -k /usr/tests/Kyuafile sys/netinet6/exthdr:exthdr
sys/netinet6/exthdr:exthdr  ->  Fatal kernel mode data abort: 'Alignment Fault' on read
trapframe: 0xdfb97aa0
FSR=00000001, FAR=db43ab76, spsr=60000013
r0 =dfedd000, r1 =dfb97b34, r2 =00000000, r3 =00000000
r4 =00000000, r5 =00000000, r6 =db43ab76, r7 =db43ab66
r8 =c096383c, r9 =00000000, r10=db132400, r11=dfb97b60
r12=00000000, ssp=dfb97b30, slr=c0b4e2c0, pc =c04e6b70

panic: Fatal abort
cpuid = 0
time = 1691131498
KDB: stack backtrace:
db_trace_self() at db_trace_self
         pc = 0xc065f414  lr = 0xc007db80 (db_trace_self_wrapper+0x30)
         sp = 0xdfb97858  fp = 0xdfb97970
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
         pc = 0xc007db80  lr = 0xc031a834 (vpanic+0x140)
         sp = 0xdfb97978  fp = 0xdfb97998
         r4 = 0x00000100  r5 = 0x00000000
         r6 = 0xc07c369a  r7 = 0xc0b32e58
vpanic() at vpanic+0x140
         pc = 0xc031a834  lr = 0xc031a6f4 (vpanic)
         sp = 0xdfb979a0  fp = 0xdfb979a4
         r4 = 0xdfb97aa0  r5 = 0x00000013
         r6 = 0xdb43ab76  r7 = 0x00000001
         r8 = 0x00000001  r9 = 0xdfedd000
        r10 = 0xdb43ab76
vpanic() at vpanic
         pc = 0xc031a6f4  lr = 0xc06849dc (abort_align)
         sp = 0xdfb979ac  fp = 0xdfb979d8
         r4 = 0x00000001  r5 = 0x00000001
         r6 = 0xdfedd000  r7 = 0xdb43ab76
         r8 = 0xdfb979a4  r9 = 0xc031a6f4
        r10 = 0xdfb979ac
abort_align() at abort_align
         pc = 0xc06849dc  lr = 0xc0684a50 (abort_align+0x74)
         sp = 0xdfb979e0  fp = 0xdfb979f8
         r4 = 0x00000013 r10 = 0xdb43ab76
abort_align() at abort_align+0x74
         pc = 0xc0684a50  lr = 0xc06846a8 (abort_handler+0x45c)
         sp = 0xdfb97a00  fp = 0xdfb97a98
         r4 = 0x00000000 r10 = 0xdb43ab76
abort_handler() at abort_handler+0x45c
         pc = 0xc06846a8  lr = 0xc0661cc8 (exception_exit)
         sp = 0xdfb97aa0  fp = 0xdfb97b60
         r4 = 0x00000000  r5 = 0x00000000
         r6 = 0xdb43ab76  r7 = 0xdb43ab66
         r8 = 0xc096383c  r9 = 0x00000000
        r10 = 0xdb132400
exception_exit() at exception_exit
         pc = 0xc0661cc8  lr = 0xc0b4e2c0 (__pcpu)
         sp = 0xdfb97b30  fp = 0xdfb97b60
         r0 = 0xdfedd000  r1 = 0xdfb97b34
         r2 = 0x00000000  r3 = 0x00000000
         r4 = 0x00000000  r5 = 0x00000000
         r6 = 0xdb43ab76  r7 = 0xdb43ab66
         r8 = 0xc096383c  r9 = 0x00000000
        r10 = 0xdb132400 r12 = 0x00000000
in6ifa_ifwithaddr() at in6ifa_ifwithaddr+0x30
         pc = 0xc04e6b70  lr = 0xc04f9030 (ip6_input+0xd38)
         sp = 0xdfb97b68  fp = 0xdfb97c28
         r4 = 0xdb43ab76  r5 = 0xdb43ab5e
         r6 = 0x00000000  r7 = 0xdb43ab66
ip6_input() at ip6_input+0xd38
         pc = 0xc04f9030  lr = 0xc046d66c (netisr_dispatch_src+0xf8)
         sp = 0xdfb97c30  fp = 0xdfb97c58
         r4 = 0xdb43ab00  r5 = 0x00000006
         r6 = 0x00000007  r7 = 0xc0b49d50
         r8 = 0xdafea0c0  r9 = 0xdb43ab00
        r10 = 0x00000086
netisr_dispatch_src() at netisr_dispatch_src+0xf8
         pc = 0xc046d66c  lr = 0xc04641b0 (ether_demux+0x18c)
         sp = 0xdfb97c60  fp = 0xdfb97c78
         r4 = 0x00000006  r5 = 0x00001201
         r6 = 0xdb132400  r7 = 0x000000ff
         r8 = 0xdafea0c0  r9 = 0xdb43ab00
        r10 = 0x00000086
ether_demux() at ether_demux+0x18c
         pc = 0xc04641b0  lr = 0xc0465880 (ether_nh_input+0x490)
         sp = 0xdfb97c80  fp = 0xdfb97ce0
         r4 = 0xdb132400  r5 = 0xdb43ab00
         r6 = 0xdb43ab50 r10 = 0x00000086
ether_nh_input() at ether_nh_input+0x490
         pc = 0xc0465880  lr = 0xc046d66c (netisr_dispatch_src+0xf8)
         sp = 0xdfb97ce8  fp = 0xdfb97d10
         r4 = 0xdb43ab00  r5 = 0x00000005
         r6 = 0x0000000c  r7 = 0xc0b49d30
         r8 = 0xdafea0c0  r9 = 0xdb43ab00
        r10 = 0xc098d18f
netisr_dispatch_src() at netisr_dispatch_src+0xf8
         pc = 0xc046d66c  lr = 0xc04645c4 (ether_input+0x50)
         sp = 0xdfb97d18  fp = 0xdfb97d48
         r4 = 0xdb43ab00  r5 = 0x00000000
         r6 = 0x00008803  r7 = 0x00000000
         r8 = 0xdafea0c0  r9 = 0xdb43ab00
        r10 = 0xc098d18f
ether_input() at ether_input+0x50
         pc = 0xc04645c4  lr = 0xdffb3f08 ($a.10+0x108)
         sp = 0xdfb97d50  fp = 0xdfb97d78
         r4 = 0xdb132400  r5 = 0xdaff8b00
         r6 = 0xdaff8b10  r7 = 0x00000000
         r8 = 0x00000000 r10 = 0xc098d18f
$a.10() at $a.10+0x108
         pc = 0xdffb3f08  lr = 0xc038cb2c (taskqueue_run_locked+0x1c4)
         sp = 0xdfb97d80  fp = 0xdfb97dd8
         r4 = 0xe0145100  r5 = 0xdaff8b2c
         r6 = 0xe0145150  r7 = 0x00000001
         r8 = 0x00000000  r9 = 0xdfb97d90
        r10 = 0x00000001
taskqueue_run_locked() at taskqueue_run_locked+0x1c4
         pc = 0xc038cb2c  lr = 0xc038e4e4 (taskqueue_thread_loop+0x1b0)
         sp = 0xdfb97de0  fp = 0xdfb97e10
         r4 = 0xe0145100  r5 = 0xe0145140
         r6 = 0xc07af4c4  r7 = 0x00000000
         r8 = 0xc098d18f  r9 = 0x00000100
        r10 = 0xc0b228a0
taskqueue_thread_loop() at taskqueue_thread_loop+0x1b0
         pc = 0xc038e4e4  lr = 0xc02cdf0c (fork_exit+0xc0)
         sp = 0xdfb97e18  fp = 0xdfb97e38
         r4 = 0xdfedd000  r5 = 0xc0b224e0
         r6 = 0xc038e334  r7 = 0xdffc4f54
         r8 = 0xdfb97e40  r9 = 0xc098d191
fork_exit() at fork_exit+0xc0
         pc = 0xc02cdf0c  lr = 0xc0661c5c (swi_exit)
         sp = 0xdfb97e40  fp = 0x00000000
         r4 = 0xc038e334  r5 = 0xdffc4f54
         r6 = 0xc0b45d84  r7 = 0xd73bcba0
         r8 = 0x00000001 r10 = 0xc0b228a0
swi_exit() at swi_exit
         pc = 0xc0661c5c  lr = 0xc0661c5c (swi_exit)
         sp = 0xdfb97e40  fp = 0x00000000
KDB: enter: panic
[ thread pid 0 tid 100230 ]

For reference:

# uname -apKU
FreeBSD OPiP2E-RPi2v1p1 14.0-CURRENT FreeBSD 14.0-CURRENT armv7 1400093 #6 main-n264334-215bab7924f6-dirty: Tue Jul 25 23:11:39 PDT 2023     root@CA72-16Gp-ZFS:/usr/obj/BUILDs/main-CA7-nodbg-clang/usr/main-src/arm.armv7/sys/GENERIC-NODBG-CA7 arm armv7 1400093 1400093

The OrangePi+ 2Ed was the type of system booted and tested.

===
Mark Millard
marklmi at yahoo.com