[Bug 272965] armv7 'Alignment Fault' on read panic for kyua's sys/netinet6/exthdr:exthdr : an example

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272965

            Bug ID: 272965
           Summary: armv7 'Alignment Fault' on read panic for kyua's
                    sys/netinet6/exthdr:exthdr : an example
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: marklmi26-fbsd@yahoo.com

EXAMPLE armv7 related 'Alignment Fault' on read panic:

The kyua sys/netinet6/exthdr:exthdr panic has a different backtrace than
I've had from my builds of somewhat older FreeBSD main commits, udp_input
this time. I'm submitting what does not depend on my builds.

# /usr/bin/kyua test -k /usr/tests/Kyuafile sys/netinet6/exthdr:exthdr
sys/netinet6/exthdr:exthdr  ->  warning: KLD '/boot/kernel/if_epair.ko' is
newer than the linker.hints file
Fatal kernel mode data abort: 'Alignment Fault' on read
trapframe: 0xe014ab00
FSR=00000001, FAR=da87f00e, spsr=20000013
r0 =00000000, r1 =00000001, r2 =00000001, r3 =00000134
r4 =00000000, r5 =00000134, r6 =da87f00e, r7 =da87f022
r8 =00000134, r9 =c0918b04, r10=00000014, r11=e014ac28
r12=00000000, ssp=e014ab90, slr=c04534f4, pc =c048b34c

panic: Fatal abort
cpuid = 1
time = 1691281420
KDB: stack backtrace:
db_trace_self() at db_trace_self
        pc = 0xc05ecde4  lr = 0xc0079c70 (db_trace_self_wrapper+0x30)
        sp = 0xe014a8b8  fp = 0xe014a9d0
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
        pc = 0xc0079c70  lr = 0xc02e99a0 (vpanic+0x140)
        sp = 0xe014a9d8  fp = 0xe014a9f8
        r4 = 0x00000100  r5 = 0x00000000
        r6 = 0xc07597e2  r7 = 0xc0aeaec8
vpanic() at vpanic+0x140
        pc = 0xc02e99a0  lr = 0xc02e9780 (doadump)
        sp = 0xe014aa00  fp = 0xe014aa04
        r4 = 0xe014ab00  r5 = 0x00000013
        r6 = 0xda87f00e  r7 = 0x00000001
        r8 = 0x00000001  r9 = 0xe0773ba0
       r10 = 0xda87f00e
doadump() at doadump
        pc = 0xc02e9780  lr = 0xc0611184 (abort_align)
        sp = 0xe014aa0c  fp = 0xe014aa38
        r4 = 0xda87f00e  r5 = 0xe014aa04
        r6 = 0xc02e9780 r10 = 0xe014aa0c
abort_align() at abort_align
        pc = 0xc0611184  lr = 0xc06111f8 (abort_align+0x74)
        sp = 0xe014aa40  fp = 0xe014aa58
        r4 = 0x00000013 r10 = 0xda87f00e
abort_align() at abort_align+0x74
        pc = 0xc06111f8  lr = 0xc0610e18 (abort_handler+0x498)
        sp = 0xe014aa60  fp = 0xe014aaf8
        r4 = 0x00000000 r10 = 0xda87f00e
abort_handler() at abort_handler+0x498
        pc = 0xc0610e18  lr = 0xc05ef6ac (exception_exit)
        sp = 0xe014ab00  fp = 0xe014ac28
        r4 = 0x00000000  r5 = 0x00000134
        r6 = 0xda87f00e  r7 = 0xda87f022
        r8 = 0x00000134  r9 = 0xc0918b04
       r10 = 0x00000014
exception_exit() at exception_exit
        pc = 0xc05ef6ac  lr = 0xc04534f4 (ip_input+0x404)
        sp = 0xe014ab90  fp = 0xe014ac28
        r0 = 0x00000000  r1 = 0x00000001
        r2 = 0x00000001  r3 = 0x00000134
        r4 = 0x00000000  r5 = 0x00000134
        r6 = 0xda87f00e  r7 = 0xda87f022
        r8 = 0x00000134  r9 = 0xc0918b04
       r10 = 0x00000014 r12 = 0x00000000
udp_input() at udp_input+0x1c0
        pc = 0xc048b34c  lr = 0xc04534f4 (ip_input+0x404)
        sp = 0xe014ac30  fp = 0xe014ac70
        r4 = 0x00000001  r5 = 0x00000000
        r6 = 0x00000000  r7 = 0x01000193
        r8 = 0xda87f00e  r9 = 0xc094a938
       r10 = 0x00000014
ip_input() at ip_input+0x404
        pc = 0xc04534f4  lr = 0xc04235bc (netisr_dispatch_src+0x100)
        sp = 0xe014ac78  fp = 0xe014aca0
        r4 = 0x00000004  r5 = 0xda854000
        r6 = 0x00000000  r7 = 0xc0b5a2f8
        r8 = 0x00000000  r9 = 0xc57f7780
       r10 = 0x00000008
netisr_dispatch_src() at netisr_dispatch_src+0x100
        pc = 0xc04235bc  lr = 0xc041a384 (ether_demux+0x1bc)
        sp = 0xe014aca8  fp = 0xe014acc0
        r4 = 0xda854000  r5 = 0x00000001
        r6 = 0xdb846400  r7 = 0x5e4a6f28
        r8 = 0x00000000  r9 = 0xc57f7780
       r10 = 0x00000008
ether_demux() at ether_demux+0x1bc
        pc = 0xc041a384  lr = 0xc041bb68 (ether_nh_input+0x3dc)
        sp = 0xe014acc8  fp = 0xe014acf0
        r4 = 0xdb846400  r5 = 0xda854000
        r6 = 0xda87f000 r10 = 0x00000008
ether_nh_input() at ether_nh_input+0x3dc
        pc = 0xc041bb68  lr = 0xc04235bc (netisr_dispatch_src+0x100)
        sp = 0xe014acf8  fp = 0xe014ad20
        r4 = 0x00000006  r5 = 0xda854000
        r6 = 0x00000000  r7 = 0xc0b5a378
        r8 = 0x5e4a6f28  r9 = 0xc57f7780
       r10 = 0x00000000
netisr_dispatch_src() at netisr_dispatch_src+0x100
        pc = 0xc04235bc  lr = 0xc041a808 (ether_input+0xec)
        sp = 0xe014ad28  fp = 0xe014ad60
        r4 = 0xdb846400  r5 = 0x00000000
        r6 = 0xda854000  r7 = 0x00000000
        r8 = 0x5e4a6f28  r9 = 0xc57f7780
       r10 = 0x00000000
ether_input() at ether_input+0xec
        pc = 0xc041a808  lr = 0xe098310c ($a.10+0xbc)
        sp = 0xe014ad68  fp = 0xe014ad90
        r4 = 0xdb846400  r5 = 0xdb7bf8c0
        r6 = 0x00000000  r7 = 0xda854000
        r8 = 0xe09724d3  r9 = 0xdb7bf8d0
       r10 = 0x00000000
$a.10() at $a.10+0xbc
        pc = 0xe098310c  lr = 0xc03504dc (taskqueue_run_locked+0xb8)
        sp = 0xe014ad98  fp = 0xe014ade0
        r4 = 0xe0769e00  r5 = 0xe0769e50
        r6 = 0xdb7bf8ec  r7 = 0x00000001
        r8 = 0x00000001  r9 = 0xc0768ff7
       r10 = 0x00000000
taskqueue_run_locked() at taskqueue_run_locked+0xb8
        pc = 0xc03504dc  lr = 0xc0351560 (taskqueue_thread_loop+0x108)
        sp = 0xe014ade8  fp = 0xe014ae18
        r4 = 0x00000000  r5 = 0xe0769e00
        r6 = 0xe0769e40  r7 = 0xc073cb53
        r8 = 0xe0769e50  r9 = 0x00000100
       r10 = 0xc0afde44
taskqueue_thread_loop() at taskqueue_thread_loop+0x108
        pc = 0xc0351560  lr = 0xc02a384c (fork_exit+0xa0)
        sp = 0xe014ae20  fp = 0xe014ae38
        r4 = 0xe0773ba0  r5 = 0xc0ada560
        r6 = 0xc0351458  r7 = 0xe0993f94
        r8 = 0xe014ae40  r9 = 0xc0afab7c
fork_exit() at fork_exit+0xa0
        pc = 0xc02a384c  lr = 0xc05ef640 (swi_exit)
        sp = 0xe014ae40  fp = 0x00000000
        r4 = 0xc0351458  r5 = 0xe0993f94
        r6 = 0xc0942429  r7 = 0xc72f21d0
        r8 = 0xc0ada900 r10 = 0xc0afde44
swi_exit() at swi_exit
        pc = 0xc05ef640  lr = 0xc05ef640 (swi_exit)
        sp = 0xe014ae40  fp = 0x00000000
KDB: enter: panic

I've reported another backtrace previously that
I'll not repeat here. But such was for my personal
build context, unlike here.

"'Alignment Fault' on read" happens even on the cortex-A7
system, no lib32 involved, no chroot involved. The details
may vary for the backtrace across the contexts.

Notes:

I'd set up armv7 USB boot media based on:

http://ftp3.freebsd.org/pub/FreeBSD/snapshots/ISO-IMAGES/14.0/FreeBSD-14.0-CURRENT-arm-armv7-GENERICSD-20230803-8a5c836b51ce-264491.img.xz

for the OrangePi+2Ed (it also handles the RPi2B v1.1). The OrangePi+2Ed u-boot
is on other media, so the boot media was not modified for that.  The built-in
Ethernet port was the only networking interface in use.

No builds by me were involved for the USB boot media. The ports installed
are from the FreeBSD servers and are for kyua activity's use (plus
dependencies), other than gdb.

I'll note that a fresh install of the snapshot gets the "warning: KLD
'/boot/kernel/if_epair.ko' is newer than the linker.hints file" notice
until one does, say, a "kldxref /boot/kernel/" .

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