[Bug 230887] Connection to strongswan 5.6.3 produce Fatal data abort

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230887

            Bug ID: 230887
           Summary: Connection to strongswan 5.6.3 produce Fatal data
                    abort
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: hlh at restart.be

Running FreeBSD norquay.restart.bel 12.0-ALPHA3 FreeBSD 12.0-ALPHA3 #0 r338288
on pine64+ 2GB.

When I establish a VPN from my phone to strongswan 5.6.3 the system encounter

Fatal data abort:
  x0:                0
  x1:               1c
  x2: ffff0000406e6000
  x3:         c0000006
  x4:               3f
  x5:              801
  x6: ffff000058961e10
  x7: ffff000058961e0c
  x8:                0
  x9: ffff000000ac6000
 x10:                1
 x11:         deadbeef
 x12:               f7
 x13:              369
 x14:                0
 x15:                1
 x16: ffff0000605552c0
 x17: ffff0000003a2c9c
 x18: ffff0000589626f0
 x19: fffffd00684b5a00
 x20:                0
 x21:                0
 x22:                0
 x23:                0
 x24:                0
 x25: ffff0000008b5000
 x26: fffffd0009e3702c
 x27: fffffd0042ac2200
 x28: ffff0000008b5000
 x29:                0
  sp: ffff0000589626f0
  lr: ffff0000003e660c
 elr: ffff0000003e5f98
spsr:         60000005
 far: ffffffffffffffa8
Fatal data abort:
  x0:                0
  x1:               1c
  x2: ffff0000406e6000
  x3:         c0000006
  x4:               3f
  x5:              801
  x6: ffff000058961e10
  x7: ffff000058961e0c
  x8:                0
  x9: ffff000000ac6000
 x10:                1
 x11:         deadbeef
 x12:               f7
 x13:              369
 x14:                0
 x15:                1
 x16: ffff0000605552c0
 x17: ffff0000003a2c9c
 x18: ffff0000589626f0
 x19: fffffd00684b5a00
 x20:                0
 x21:                0
 x22:                0
 x23:                0
 x24:                0
 x25: ffff0000008b5000
 x26: fffffd0009e3702c
 x27: fffffd0042ac2200
 x28: ffff0000008b5000
 x29:                0
  sp: ffff0000589626f0
  lr: ffff0000003e660c
 elr: ffff0000003e5f98
spsr:         60000005
 far: ffffffffffffffa8
 esr:         96000004
[ thread pid 12 tid 100019 ]
Stopped at      ip_forward+0x7c:        ldr     x8, [x29, #-88]
db> bt
Tracing pid 12 tid 100019 td 0xfffffd000019d000
db_trace_self() at db_stack_trace+0xf0
         pc = 0xffff0000005e776c  lr = 0xffff00000008b9b4
         sp = 0xffff000058962000  fp = 0xffff000058962030

db_stack_trace() at db_command+0x220
         pc = 0xffff00000008b9b4  lr = 0xffff00000008b638
         sp = 0xffff000058962040  fp = 0xffff000058962120

db_command() at db_command_loop+0x60
         pc = 0xffff00000008b638  lr = 0xffff00000008b3fc
         sp = 0xffff000058962130  fp = 0xffff000058962150

db_command_loop() at db_trap+0xf4
         pc = 0xffff00000008b3fc  lr = 0xffff00000008e5cc
         sp = 0xffff000058962160  fp = 0xffff000058962380

db_trap() at kdb_trap+0x1c8
         pc = 0xffff00000008e5cc  lr = 0xffff0000002fb38c
         sp = 0xffff000058962390  fp = 0xffff000058962440
--More--        
kdb_trap() at data_abort+0x1c0
         pc = 0xffff0000002fb38c  lr = 0xffff0000005fff7c
         sp = 0xffff000058962450  fp = 0xffff000058962500

data_abort() at do_el1h_sync+0x11c
         pc = 0xffff0000005fff7c  lr = 0xffff0000005ffcb8
         sp = 0xffff000058962510  fp = 0xffff000058962540

do_el1h_sync() at handle_el1h_sync+0x74
         pc = 0xffff0000005ffcb8  lr = 0xffff0000005e9874
         sp = 0xffff000058962550  fp = 0xffff000058962660

handle_el1h_sync() at ip_forward+0x6ec
         pc = 0xffff0000005e9874  lr = 0xffff0000003e6608
         sp = 0xffff000058962670  fp = 0x0000000000000000

db>

The same configuration under 12.0-CURRENT r333055 run smoothly.

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